Phase discrimination apparatus

The present invention relates to a phase discriminator that discriminates which phase each load is connected to in a multi-phase AC power distribution system.

When a consumer introduces a distributed power source such as a photovoltaic power generation device, a reverse power flow, which is a power flow from the customer side to the power system side, is generated. In addition, the reverse power flow causes the distribution line voltage to rise. Distributed power sources are also introduced by consumers who receive single-phase power supply such as ordinary households, so the situation of reverse power flow and voltage rise differs depending on the phase of the multi-phase AC power supplied to the distribution line. .. The distribution line is composed of a plurality of wires provided for each phase of the multi-phase AC power. Therefore, it is desirable to analyze the effects of reverse power flow and voltage rise based on the information on which phase of the distribution line corresponds to the power supply to each consumer, and consider countermeasures.

Further, in order to effectively suppress the imbalance of the distribution system, the distribution system is configured based on the information on how the load is connected to the electric wires corresponding to each phase of the distribution line at present. It is desirable to make a plan to form the distribution equipment.

From this point of view, it is required to grasp which phase of the distribution line the distribution transformer, which is interposed between each load and the distribution line, is connected to the wire.

However, since the distribution lines are twisted in the middle or the phase order is changed to eliminate the imbalance, the correspondence between each line constituting the distribution line and the sending phase of the distribution substation. May not be identified. In this case, it becomes unclear which phase of the distribution line the transformer for distribution is connected to. In addition, when it is difficult to inspect the result of construction of a distribution transformer, it may not be possible to control which phase of the distribution line each distribution transformer is connected to.

By visually checking the distribution line and the distribution transformer, the phase corresponding to the wire to which the distribution transformer is connected (hereinafter sometimes referred to as the "connection phase") can be clarified, but the distribution line The range of deployment and the number of transformers for distribution are enormous, and there are some invisible parts such as underground cables. Therefore, it is not realistic to visually check all distribution lines and distribution transformers.

On the other hand, a method has been proposed in which a measuring device is installed on the distribution line to specify the correspondence between the sending phase from the distribution substation and the supply phase to the consumer.

For example, there is a transmission / distribution line phase detection system that detects the same phase between any two points of a transmission / distribution line by recording and comparing the time when the zero cross of the distribution line voltage is detected (for example, Patent Document 1 (for example, Patent Document 1). See Fig. 4), lines 46-49, right column on page 2.). Transmission and distribution lines include transmission lines and distribution lines.

In addition, a signal generator installed in a distribution substation injects a different signal for each phase into a distribution line, and this is detected by a distribution transformer or a signal discriminator installed in a meter at a demand point. , There is a phase identification method for identifying connected phases (see, for example, Patent Document 2 (see, page 3, line 49-page 4, line 1, FIG. 2)).

In addition, by comparing the voltage profile measured by the measuring instrument installed on the distribution line with the voltage profile measured by the meter at the demand point, the power to determine which phase of the line each meter is connected to. There is a system configuration automatic detection system (see, for example, Patent Document 3 (page 5, lines 29-35, FIG. 2)).

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-215248</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2010-156694</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2010-161923</text></patcit></p>

<p num="0012"> In the technique disclosed in Patent Document 1 described above, the same phase between two points of the distribution line is specified by using a device for detecting zero cross of voltage (hereinafter, may be referred to as zero cross detection device). When determining the connection phase of each distribution transformer using this technology and determining the connection phase of each load connected to the distribution line via the distribution transformer, the already installed distribution transformer It is necessary to add a zero-cross detector to each device. Therefore, there is a problem that the cost of distribution equipment including a distribution transformer increases.</p><p num="0013"> Further, since the number of distribution transformers is enormous, when adding a zero-cross detection device to a distribution transformer, there is a problem that it takes time and effort to add the zero-cross detection device. It is possible to reduce the cost of adding a zero-cross detection device by making the zero-cross detection device portable and allowing an operator to go to the installation location of each distribution transformer to identify the phase. However, since the worker needs to go to the installation location of the distribution transformer, there is a problem that the amount of work of the worker increases.</p><p num="0014"> In the technique disclosed in Patent Document 2 described above, the connection phase of each load is determined by a signal generator that injects a signal into a distribution line and a signal discriminator that discriminates the signal. This technique requires the addition of a signal discriminator to the distribution transformer or meter. Therefore, there is a problem that the cost of distribution equipment including distribution transformers and meters increases.</p><p num="0015"> In the technique disclosed in Patent Document 3 described above, the connection phase of the load is determined by comparing the voltage profile on the distribution line with the voltage profile on the meter. The voltage profile on the distribution line can be obtained using a compartmentalized switch that separates the distribution line. On the other hand, the voltage profile of the meter cannot be obtained even if the meter is used as it is. Since the meter originally measures the amount of electric power, it is necessary to add a new device to the meter in order to measure the voltage at a cycle sufficient to compare the voltage profiles and make a phase judgment. .. Therefore, there is a problem that the cost of the distribution equipment including the meter increases.</p><p num="0016"> As described above, in the conventional technique, it is necessary to add a new device to the distribution transformer or the meter in order to determine the connection phase of each load. Therefore, there is a problem that the cost of the distribution equipment increases.</p><p num="0017"> In addition, in the conventional technology, if the worker goes to the installation location of the distribution transformer to identify the phase in order to suppress the increase in the cost of the distribution equipment, the amount of work of the worker increases. There's a problem.</p><p num="0018"> An object of the present invention is to provide a phase discrimination device capable of easily discriminating the connection phase of a load without increasing the cost of a power distribution facility and the work load of a worker.</p>

<p num="0019"> The phase discriminator of the present invention is in the distribution line to which a distribution transformer means for transforming multi-phase AC power distributed from the distribution system via a distribution line and supplying it to a load installed at a demand point is connected. A phase discriminator that discriminates the connection phase, which is the phase of the polyphase AC power, and periodically determines the electrical characteristics of the polyphase AC power supplied to the distribution line for each phase of the polyphase AC power. A distribution line measurement value acquisition means that acquires the distribution line measurement value from a distribution line control means that measures and controls the continuity of the distribution line based on the distribution line measurement value that is the measurement result of the electrical characteristics. The power consumption amount, which is the amount of power consumed by the load installed at the demand point, is periodically measured for each phase of the multiphase AC power, and the load measurement value which is the measurement result of the power consumption amount is obtained. The load measurement value acquisition means for acquiring the load measurement value from the load measurement means for notifying the load measurement value recording means or the load measurement value recording means, the distribution system configuration information indicating the configuration of the distribution system, and the power distribution. A storage means for storing transformer means configuration information representing the configuration of the transformer means, supply equipment configuration information representing the configuration of the power distribution transformer means installed at the demand point, and the supply equipment including the load measuring means, and the storage means described above. From the period in which the distribution line measurement value is measured by the distribution line measuring means and the period in which the load measurement value is measured by the load measurement means, a time cross section which is a period used for determining the connection phase is selected. The time section selection means, the distribution line measurement value and the load measurement value measured in the time section selected by the time section selection means, the distribution system configuration information stored in the storage means, and the transformation means configuration. It is characterized by including a phase discrimination processing means for discriminating the connection phase of the power distribution transformer means based on the information and the supply equipment configuration information.</p>

<p num="0020"> According to the phase discrimination device of the present invention, the distribution line measurement value and the load measurement value measured in the time cross section selected by the time cross section selection means, the distribution system configuration information, the transformer means configuration information, and the power distribution system configuration information stored in the storage means. Based on the supply equipment configuration information, the phase discrimination processing means discriminates the connection phase of the distribution transformer means. The distribution line measurement value is measured by the distribution line measuring means in order to control the continuity of the distribution line. Further, the load measurement value is measured by the load measurement means in order to notify the load measurement value recording means. Since the connection phase of the distribution transformer means is determined using these distribution line measurement values and the load measurement value, the means for measuring the distribution line measurement value and the load are used to determine the connection phase of the distribution transformer means. There is no need to add a new means for measuring the measured value to the distribution equipment. Also, the worker does not have to go to the demand point to determine the connection phase.</p><p num="0021"> Therefore, the connection phase of the distribution transformer means can be easily determined without increasing the cost of the distribution equipment and the work load of the operator. As a result, the connection phase of the load can be easily determined without increasing the cost of the distribution equipment and the workload of the operator.</p>

<figref num="1">It is a block diagram which shows the structure of the power distribution system control system 100 which includes the phase discrimination apparatus 110 which is 1st Embodiment of this invention.</figref><figref num="2">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in 1st Embodiment of this invention.</figref><figref num="3">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in 1st Embodiment of this invention.</figref><figref num="4">It is a figure which shows the relationship of the line current vector of each phase and the load current vector between each phase.</figref><figref num="5">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in the 2nd Embodiment of this invention.</figref><figref num="6">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in the 2nd Embodiment of this invention.</figref><figref num="7">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in the 3rd Embodiment of this invention.</figref><figref num="8">It is a flowchart which shows the processing procedure of the phase discrimination apparatus 110 concerning the phase discrimination processing in the 3rd Embodiment of this invention.</figref><figref num="9">It is a flowchart which shows the processing procedure of the phase discrimination processing apparatus 110 concerning the phase discrimination processing in 4th Embodiment of this invention.</figref><figref num="10">It is a flowchart which shows the processing procedure of the phase discrimination processing apparatus 110 concerning the phase discrimination processing in 4th Embodiment of this invention.</figref><figref num="11">It is a flowchart which shows the processing procedure of the phase discrimination processing apparatus 110 concerning the phase discrimination processing in 4th Embodiment of this invention.</figref>

&lt;First Embodiment&gt; FIG. 1 is a block diagram showing a configuration of a power distribution system control system 100 including a phase discrimination device 110 according to the first embodiment of the present invention. The distribution system control system 100 includes a distribution wire 101, a distribution breaker 102, a circuit breaker slave station 103, a sensor built-in division switch 104, a switch slave station 105, a distribution monitoring control master station 106, a distribution transformer 107, and a smart. It is configured to include a meter 108, an automatic meter reading master station 109, and a phase discrimination device 110.

The distribution circuit breaker 102 and the circuit breaker slave station 103 are installed in the distribution substation 120. A plurality of distribution lines 101 extend from the distribution substation 120. The distribution line 101 is connected to a load (not shown) installed in the consumer premises, which is a demand point.

Equipment such as the distribution substation 120 and the distribution breaker 102 and the circuit breaker slave station 103 installed in the distribution substation 120 constitutes a distribution system. A multi-phase AC power composed of a plurality of single-phase AC powers having different phases is sent from the distribution system to each distribution line 101. In the present embodiment, three-phase AC power composed of three single-phase AC powers is sent to the distribution line 101.

A plurality of distribution transformers 107 are connected to the distribution line 101. The multi-phase AC power is supplied to the load installed at the demand point via the distribution line 101 and the distribution transformer 107. In order to supply multi-phase AC power for each phase, the distribution line 101 is composed of a plurality of wires. The multi-phase AC power is supplied from the distribution system to the corresponding electric wires of the distribution line 101 for each phase. In this embodiment, the distribution line 101 includes three wires. Three-phase AC power is supplied to these three electric wires for each phase.

The same number of distribution line breakers 102 as those of the distribution line 101 are provided, and they are connected in series to each distribution line 101. The power distribution circuit breaker 102 is connected to the sensor built-in section switch 104 via the distribution line 101. Further, the power distribution circuit breaker 102 is connected to the power distribution monitoring control master station 106 via the circuit breaker slave station 103.

The distribution circuit breaker 102 controls the continuity of the distribution line 101. The power distribution circuit breaker 102 is configured to be switchable between a closed state that enables continuity of the distribution line 101 and an open state that cuts off the continuity of the distribution line 101. The power distribution circuit breaker 102 is closed during power distribution. That is, when the power distribution circuit breaker 102 is in the closed state, a current flows through the distribution line 101. When the distribution circuit breaker 102 is switched from the closed state to the open state, the current flowing through the distribution line 101 is cut off.

The distribution circuit breaker 102 measures the sending current sent from the distribution substation 120 to the distribution line 101. When an accident such as a ground fault occurs in a load connected to the distribution line 101 and the measured sending current value exceeds a predetermined value, the power distribution circuit breaker 102 is switched from the closed state to the open state. Instead, the current flowing through the distribution line 101 is cut off. The value of the sending current measured by the distribution circuit breaker 102 (hereinafter, may be referred to as circuit breaker measurement value) is transmitted from the circuit breaker slave station 103 to the distribution monitoring control master station 106 via the communication line. ..

The circuit breaker slave station 103 acquires the value measured by the power distribution circuit breaker 102 and transmits it to the power distribution monitoring control master station 106. Further, the circuit breaker slave station 103 provides information indicating that the power distribution circuit breaker 102 is switched from the closed circuit state to the open circuit state when the power distribution circuit breaker 102 is switched from the closed circuit state to the open circuit state. Send to.

The power distribution monitoring control master station 106 receives the measured value transmitted from the circuit breaker slave station 103 via the communication line. The power distribution monitoring control master station 106 records the received measured value as circuit breaker measured value data. This circuit breaker measurement value data is referred to when necessary in the phase discrimination process by the phase discrimination device 110. The contents of the circuit breaker measurement value data will be described later.

The sensor built-in section switch 104 is connected in series with the distribution line 101. A plurality of sensor built-in section switches 104 are provided for one distribution line 101. Each sensor built-in section switch 104 is connected via a distribution line 101. In other words, a plurality of sensor built-in section switches 104 are connected in series to each distribution line 101 at intervals. Each distribution line 101 is divided into a plurality of sections by a plurality of sensor built-in division switches 104.

In FIG. 1, the sensor built-in section switch 104 connected to one distribution line 101 is shown, and the sensor built-in section switch 104 connected to the other distribution line 101 is omitted, but it is actually shown. Is also connected to the other distribution line 101 with the sensor built-in section switch 104.

The sensor built-in compartmentalized switch 104 is a compartmentalized switch having a built-in voltage transformer (abbreviation: PT) and a current transformer (abbreviation: CT). The sensor built-in section switch 104 measures the effective value of each line voltage, the effective value of the line current, and the phase difference between the line current and the line voltage of the connected distribution line 101 at a predetermined cycle.

The sensor built-in section switch 104 controls the continuity of the distribution line 101. The sensor built-in section switch 104 is configured to be switchable between a closed state that enables conduction of the distribution line 101 and an open state that cuts off the continuity of the distribution line 101.

Specifically, the sensor built-in section switch 104 has a contact that closes by excitation of an electromagnet and opens by demagnetization. The section switch 104 is in a closed state in which the contacts are closed during power distribution. Further, when the voltage of the distribution line 101 drops due to a failure of the distribution line 101 or the like, the division switch 104 is in an open state in which the contacts are opened due to demagnetization. When the section switch 104 is in the closed state, a current flows through the distribution line 101. When the section switch 104 is switched from the closed state to the open state, the current flowing through the distribution line 101 is cut off .

The switch slave station 105 is provided with the same number as the sensor built-in section switch 104, and is connected to each sensor built-in section switch 104 in a one-to-one correspondence. Each switch slave station 105 is connected to the power distribution monitoring control master station 106 via a communication line.

Each switch slave station 105 acquires a value measured by the corresponding sensor built-in division switch 104 and transmits it to the power distribution monitoring control master station 106. Further, each switch slave station 105 controls the corresponding sensor built-in division switch 104 based on the instruction given from the power distribution monitoring control master station 106.

The value measured by each sensor built-in section switch 104 (hereinafter, may be referred to as classified switch measurement value) is from the switch slave station 105 connected to each sensor built-in switch switch 104 via a communication line. , It is transmitted to the power distribution monitoring control master station 106.

The power distribution monitoring control master station 106 receives the divided switch measurement value transmitted from the switch slave station 105 via the communication line. The power distribution monitoring control master station 106 records the received division switch measurement value as the division switch measurement value data. The division switch measurement value data is referred to when necessary in the phase discrimination process by the phase discrimination device 110. The contents of the division switch measurement value data will be described later. The power distribution monitoring control master station 106 is installed in, for example, a control office or a business office.

Within the section of the distribution line 101 (hereinafter sometimes referred to as the "distribution line section") divided by the two adjacent sensor-built section switches 104, the consumer who is supplied with power via the distribution transformer 107, Alternatively, a smart meter 108 installed in a customer to which power is directly supplied from within the distribution line section is connected. The distribution line 101 is divided into a plurality of distribution line sections by the sensor built-in division switch 104. FIG. 1 shows a case where the smart meter 108 is connected in the distribution line section via the distribution transformer 107, but the smart meter 108 is installed in a customer who is directly supplied with power from the distribution line section. In this case, the smart meter 108 is directly connected to the distribution line section without going through the distribution transformer 107.

The distribution transformer 107 transforms, specifically, lowers the multi-phase AC power distributed via the distribution line 101 from the distribution substation 120 constituting the distribution system, and supplies it to the consumer. A load (not shown) installed in the consumer premises, which is a demand point, is connected to the distribution transformer 107. Specifically, the distribution transformer 107 supplies the transformed multi-phase AC power to a load (not shown) installed in the customer's premises.

The distribution transformer 107 is connected to any or all of a plurality of electric wires constituting the distribution line 101. In this embodiment, the distribution transformer 107 is connected to any or all of the three wires to which each phase of the three-phase AC power is supplied.

The phase discrimination device 110 discriminates the connection phase, which is the phase of the multi-phase AC power in the distribution line 101 to which the distribution transformer 107 is connected. In other words, the phase discrimination device 110 determines which phase of the multi-phase AC power is connected to the wire to which the distribution transformer 107 is supplied from among the plurality of wires constituting the distribution line 101. ..

The smart meter 108 measures the amount of active power consumed by the consumer at a predetermined cycle. The amount of active power consumed by the consumer is, specifically, the amount of active power consumed by a load (not shown) installed on the customer's premises. The amount of active power is measured for each phase of multi-phase AC power. That is, the smart meter 108 periodically measures the amount of power consumption, which is the amount of active power consumed by the load, for each phase of the multi-phase AC power.

The smart meter 108 has a communication function. The smart meter 108 is connected to the automatic meter reading master station 109 via a communication line. The smart meter 108 transmits the measured value of the measured active power amount (hereinafter, may be referred to as smart meter measurement value), that is, the measurement result of the power consumption amount to the automatic meter reading master station 109 via the communication line. .. As a result, the smart meter 108 notifies the automatic meter reading master station 109 of the measured value of the smart meter.

The automatic meter reading master station 109 receives the smart meter measurement value transmitted from the smart meter 108 via the communication line. The automatic meter reading master station 109 records the received smart meter measurement value as smart meter measurement value data. The smart meter measurement value data is referred to when necessary in the phase discrimination process by the phase discrimination device 110. The contents of the smart meter measurement value data will be described later. The automatic meter reading master station 109 is installed in, for example, a control office or a business office.

The phase discrimination device 110 is connected to the power distribution monitoring control master station 106 and the automatic meter reading master station 109 via a communication line. The communication line is composed of wired or wireless, or a combination of wired and wireless.

The phase discrimination device 110 includes a time cross-section selection unit 111, a phase discrimination processing unit 112, a data storage unit 113, a data storage unit 114, a communication unit 115, and an output unit 116. The time section selection unit 111, the phase discrimination processing unit 112, the data storage unit 113, the data storage unit 114, the communication unit 115, and the output unit 116 can transmit and receive data to and from each other via the data bus.

The time section selection unit 111 includes, for example, a monitor, a keyboard, and a mouse. In order to perform phase discrimination, the time section selection unit 111 may collectively refer to the breaker measurement value data, the division switch measurement value data, and the smart meter measurement value data (hereinafter collectively referred to as "measurement value data") for any period. ) Is used. In other words, the time cross section selection unit 111 selects the time cross section which is the measurement period of the measured value data used for the phase discrimination process. The operator operates the time section selection unit 111 to input an instruction to select a desired time section. The time section selection unit 111 selects the time section based on the instruction input by the operator.

The phase discrimination processing unit 112 is realized by, for example, a central processing unit (abbreviation: CPU). The phase discrimination processing unit 112 includes circuit breaker measurement value data, division switch measurement value data, and smart meter measurement value data within the period selected by the time section selection unit 111, and distribution system configuration information representing the configuration of the distribution system. , The connection phase of each distribution transformer 107 connected to the distribution line 101 is obtained based on the device information of the distribution transformer 107 and the supply equipment information of the consumer. The breaker measurement value data, the division switch measurement value data, and the smart meter measurement value data within the period selected by the time section selection unit 111 are the breaker measurement measured in the time section selected by the time section selection unit 111. Corresponds to value data, division switch measurement value data, and smart meter measurement value data.

The data storage unit 113 is realized by, for example, a dynamic random access memory (abbreviation: DRAM). The data storage unit 113 stores the progress of the calculation in the phase discrimination process and the data for input / output. The data storage unit 113 is referred to at a timing required for the phase discrimination process.

The data storage unit 114 is realized by, for example, a magnetic disk device. The data storage unit 114 stores distribution line section data, division switch arrangement data, and distribution transformer arrangement data as distribution system configuration information. Further, the data storage unit 114 stores distribution transformer equipment data as equipment information of the distribution transformer 107. Further, the data storage unit 114 stores low-voltage consumer supply equipment data and high-voltage consumer supply equipment data as consumer supply equipment information. The contents of each data stored in the data storage unit 114 will be described later.

The communication unit 115 is realized by a network interface device or the like. The communication unit 115 communicates with the distribution monitoring control master station 106 and the automatic meter reading master station 109, and acquires circuit breaker measurement value data, division switch measurement value data, and smart meter measurement value data.

The output unit 116 is realized by, for example, a display device, a printing device, or a magnetic disk device. The output unit 116 outputs the connection phase of the distribution transformer obtained by the phase discrimination processing unit 112.

The phase discrimination device 110 as a whole is realized by a computer such as a personal computer (abbreviation: PC).

The power distribution circuit breaker 102 and the sensor built-in section switch 104 correspond to the "distribution line control means" in the present invention. The distribution line control means periodically measures the electrical characteristics of the multi-phase AC power supplied to the distribution line 101 for each phase of the multi-phase AC power, and is a distribution line measurement value which is a measurement value of the electrical characteristics. The continuity of the distribution line 101 is controlled based on the above. The electrical characteristics of polyphase AC power include at least one of the current, voltage and phase difference of polyphase AC power. That is, the distribution line control means is configured to measure at least one of the current, voltage and phase difference of the polyphase AC power. In the present embodiment, the electrical characteristics of the polyphase AC power include the current, voltage and phase difference of the polyphase AC power, and the distribution line control means measures the current, voltage and phase difference of the polyphase AC power. It is configured as follows.

The distribution transformer 107 corresponds to the "distribution transformer means" in the present invention. The smart meter 108 corresponds to the "load measuring means" in the present invention. The automatic meter reading master station 109 corresponds to the "load measurement value recording means" in the present invention. The communication unit 115 corresponds to the "distribution line measurement value acquisition means" and the "load measurement value acquisition means" in the present invention. The time section selection unit 111 corresponds to the "time section selection means" in the present invention. The phase discrimination processing unit 112 corresponds to the "phase discrimination processing means" in the present invention. The data storage unit 114 corresponds to the "storage means" in the present invention.

Further, the device information of the distribution transformer 107 is information representing the configuration of the distribution transformer 107, and corresponds to the "transformer means configuration information" in the present invention. The supply equipment information of the consumer is information representing the configuration of the supply equipment installed at the demand point, and corresponds to the "supply equipment configuration information" in the present invention. The supply equipment is equipment for supplying multi-phase AC power distributed from a distribution system such as a distribution substation 120 via a distribution line 101 to a load (not shown) installed at a demand point. The supply facility includes a distribution transformer 107 and a smart meter 108.

Next, the format of each data in the first embodiment of the present invention will be described. Table 1 shows an example of circuit breaker measurement value data. The circuit breaker measurement value data is data representing the result measured by the power distribution circuit breaker 102, that is, the measured value of the sending current. The circuit breaker measurement value data corresponds to the result of one data measurement by one power distribution circuit breaker 102.

<tables num="1"></tables>

The distribution line numbers shown in Table 1 are numbers that uniquely identify the distribution line 101, and represent the distribution line 101 to be measured. I_R, I_S, I_TRepresents the measured values of the sending currents of the R phase, the S phase, and the T phase, respectively. Table 1 shows the measured value data of the circuit breaker, which is the distribution line number, the measured time, and the measured values of the R-phase, S-phase, and T-phase feed currents._R, I_S, I_TIs shown.

Table 2 shows an example of the division switch measurement value data. The division switch measurement value data is data representing the result measured by the division switch 104 with a built-in sensor. The division switch measurement value data corresponds to the result of one data measured by one sensor built-in division switch 104. The division switch number is a number that uniquely identifies the measured sensor-embedded division switch 104.

<tables num="2"></tables>

The sensor built-in section switch (hereinafter, may be simply referred to as class switch) 104 is connected in series with the three-phase distribution line 101. Of the connection terminals of the division switch 104, the three connection terminals connected to the distribution line 101 on the power supply side, that is, the distribution circuit breaker 102 side are referred to as "A terminal", "B terminal", and "C terminal", respectively. The terminal connected to the terminal A inside the section switch 104 and connected to the distribution line 101 on the load side, that is, on the distribution transformer 107 side is referred to as the "a terminal". The terminal connected to the B terminal inside the section switch 104 and connected to the distribution line 101 on the load side is referred to as a "b terminal". The terminal connected to the C terminal inside the section switch 104 and connected to the distribution line 101 on the load side is referred to as a c terminal.

In Table 2, V_ABRepresents the value of the line voltage measured between the A terminal and the B terminal. V_BCRepresents the value of the line voltage measured between the B terminal and the C terminal. V_CARepresents the value of the line voltage measured between the C terminal and the A terminal. I_A, I_B, I_CRepresents the value of the line current measured at the A terminal, the B terminal, and the C terminal, respectively. θ_AIs the line voltage V between the A terminal and the B terminal._ABAnd the line current I of the A terminal_ARepresents the phase difference between.

V_abRepresents the value of the line voltage measured between the a terminal and the b terminal. V_bcRepresents the value of the line voltage measured between the b terminal and the c terminal. V_caRepresents the value of the line voltage measured between the c terminal and the a terminal. I_a, I_{b b}, I_cRepresents the value of the line current measured at the a terminal, the b terminal, and the c terminal, respectively. θ_aIs the line voltage V between the a terminal and the b terminal._abAnd the line current I of terminal a_aRepresents the phase difference between.

Table 3 shows an example of smart meter measurement value data. The smart meter measurement value data is data representing the result measured by the smart meter 108. The smart meter measurement value data corresponds to one data measured by the smart meter 108.

<tables num="3"></tables>

The meter numbers shown in Table 3 are numbers that uniquely identify the smart meter 108 installed at the demand point. The cumulative electric energy is measured in the smart meter 108 and represents the value of the accumulated active electric energy at the measurement time.

In the phase discrimination process, when the electric energy of the smart meter 108 within a certain period is obtained, the cumulative electric energy of the data having the measurement time corresponding to the end of the period is one measurement cycle before the time corresponding to the beginning of the period. Subtract the cumulative electric energy of the data with the measurement time.

Table 4 shows an example of distribution line section data. The distribution line section data is data indicating which distribution line 101 includes each distribution line section. The distribution line section numbers shown in Table 4 are numbers that uniquely identify the distribution line sections. The distribution line number is a number that uniquely identifies the distribution line 101, and represents the distribution line 101 including the section indicated by the distribution line section number.

<tables num="4"></tables>

Table 5 shows an example of the division switch arrangement data. The division switch arrangement data is data indicating which distribution line section between the division switches 104 with built-in sensors is installed. In the compartmentalized switch arrangement data, one piece of data represents information regarding one sensor built-in compartmentalized switch 104.

<tables num="5"></tables>

The classification switch number shown in Table 5 is a number that uniquely identifies the classification switch 104 with a built-in sensor. The power supply side section number is a distribution line section number of the distribution line section connected to the power supply side when viewed from the sensor built-in switch 104. The load side section number is the distribution line section number of the distribution line section connected to the load side when viewed from the sensor built-in switch 104.

If another switch with built-in sensor 104 is not installed between a switch with built-in sensor 104 and the circuit breaker 102 for power distribution that is the transmission source, the power supply for the division switch arrangement data corresponding to the switch with built-in sensor 104. The side section number is represented by the value "(SS)". (SS) indicates that the power supply side is the distribution substation 120.

Table 6 shows an example of distribution transformer arrangement data. The distribution line section data is data indicating which distribution line section each distribution transformer 107 is included in. In the distribution line section data, one piece of data represents information about one distribution transformer 107. The distribution transformer numbers shown in Table 6 are numbers that uniquely identify the distribution transformer 107. The distribution line section number is a number that uniquely identifies the distribution line section, and represents the distribution line section including the distribution transformer 107.

<tables num="6"></tables>

Table 7 shows an example of distribution transformer equipment data. The distribution transformer equipment data is data representing the phase line type of each distribution transformer 107. In the distribution transformer equipment data, one piece of data represents information about one distribution transformer 107.

<tables num="7"></tables>

The distribution transformer numbers shown in Table 7 are numbers that uniquely identify the distribution transformer 107. The phase wire type indicates whether each distribution transformer 107 is connected by a single-phase three-wire system, a three-phase three-wire system, or a three-phase four-wire system.

In the present embodiment, two single-phase transformers that are V-connected and supplied in three phases are collectively treated as one distribution transformer 107, and the distribution transformer number is combined. Is given.

Table 8 shows an example of low-voltage consumer supply equipment data. The low-voltage consumer supply equipment data is data that represents information about the supply equipment of consumers who supply at low voltage. In the low-voltage consumer supply equipment data, one piece of data represents information about one low-voltage consumer.

<tables num="8"></tables>

The customer number shown in Table 8 is a number that uniquely identifies the customer. The meter number is a number that uniquely identifies the smart meter 108, and represents the smart meter 108 installed in the customer. The supply method indicates whether the supply to the customer is single-phase or three-phase. The distribution transformer number is a number that uniquely identifies the distribution transformer 107, and represents the distribution transformer 107 supplied to the low-voltage consumer.

Only consumers who receive single-phase supply are connected to the secondary side of the single-phase three-wire distribution transformer 107. Further, only consumers who receive supply in three phases are connected to the secondary side of the three-phase three-wire distribution transformer 107. Further, the three-phase four-wire distribution transformer 107 is connected to both a consumer who receives supply in three phases and a consumer who receives supply in single phase. Therefore, in the phase discrimination process in the present embodiment, in addition to which phase the single-phase power distribution transformer 107 is connected to, the three-phase four-wire power distribution transformer 107 is used for single-phase supply. It is also determined which phase is connected as.

Table 9 shows an example of high-voltage consumer supply equipment data. High-voltage consumer supply equipment data is data that represents information about the supply equipment of consumers who supply at high voltage. In the high-voltage consumer supply equipment data, one piece of data represents information about one high-voltage consumer.

<tables num="9"></tables>

The customer number shown in Table 9 is a number that uniquely identifies the customer. The meter number is a number that uniquely identifies the smart meter 108, and represents the smart meter 108 installed in the customer. The distribution line section number is a number that uniquely identifies the distribution line section, and represents the distribution line section to which the high-voltage consumer is connected.

The operation of the phase discrimination process according to the first embodiment of the present invention will be specifically described. 2 and 3 are flowcharts showing a processing procedure of the phase discrimination apparatus 110 relating to the phase discrimination processing according to the first embodiment of the present invention. In the flowcharts shown in FIGS. 2 and 3, the process is started when the power of the phase discrimination device 110 is turned on, and the process proceeds to step S1.

In step S1, the time cross-section selection unit 111 uses the time cross-section T for discrimination._sSelect. Specifically, the time cross-section selection unit 111 selects a period to be subjected to phase discrimination, and the selected period is referred to as a time cross section (hereinafter, may be simply referred to as cross section) T._sIs stored in the data storage unit 113.

In the conventional technique, the measurement cycle of each measurement value data is different from each other. On the other hand, in the present embodiment, in order to compare the results of integrating the measured values within the selected period, the period is selected in units that are the least common multiple of each period. For example, if the measurement cycle of the power distribution circuit breaker 102 is 10 seconds, the measurement cycle of the sensor built-in section switch 104 is 30 seconds, and the measurement cycle of the smart meter is 30 minutes, the period is in units of 30 minutes. Select.

Cross section T_sMay be selected as one continuous period or as a collection of multiple discontinuous periods. When the cross section Ts is selected in this way, the process proceeds to step S2.

In step S2, the phase discrimination processing unit 112 creates a list of distribution line sections included in the distribution line 101 to be discriminated (hereinafter, may be referred to as distribution line section list). Specifically, the phase discrimination processing unit 112 first selects and reads the distribution line section data having the distribution line number of the distribution line 101 to be discriminated from the data storage unit 114. Then, the phase discrimination processing unit 112 includes a list L of distribution line section numbers of the selected distribution line section data._secIs created and stored in the data storage unit 113 as a distribution line section list. In this way, the distribution line section list L_secIs created, the process proceeds to step S3.

In step S3, the phase discrimination processing unit 112 selects the distribution line section list L created in step S2._secTherefore, the distribution line section closest to the distribution substation 120, that is, the distribution line section closest to the distribution substation 120 side is selected. Further, the phase discrimination processing unit 112 includes the distribution line section list L._secDeletes the selected distribution line section from.

Specifically, the phase discrimination processing unit 112 first receives the distribution line section list L from the data storage unit 113._secTo read. Then, the phase discrimination processing unit 112 reads the division switch arrangement data from the data storage unit 114, and among the reading division switch arrangement data, the distribution line section corresponding to the load side section number is the distribution line read earlier. Section list L_secSelect only those included in. Further, the phase discrimination processing unit 112 extracts from the selected division switch arrangement data that the power supply side section number is (SS).

Then, the phase discrimination processing unit 112 selects the load side section number of the extracted division switch arrangement data, and the selected section number S_curIs stored in the data storage unit 113. Further, the phase discrimination processing unit 112 is a distribution line section list L of the data storage unit 113._secFrom the selected selected section number S_curDelete the distribution line section corresponding to.

In step S4, the phase discrimination processing unit 112 determines the phase order of the sensor built-in section switch 104 installed at the power supply end of the distribution line section (hereinafter, may be referred to as selective distribution line section) selected in step S3. To do. Specifically, the phase discrimination processing unit 112 determines that the consumer is not connected to the distribution line 101 between the power distribution circuit breaker 102 and the first sensor-embedded division switch 104, and determines that each phase current is sent out. , The line current of each terminal of the sensor built-in section switch 104 is compared with the average value, and the phase and the terminal are associated with each other by the closeness of the value.

As a procedure, the phase discrimination processing unit 112 first reads the division switch arrangement data from the data storage unit 114, and sets the selective distribution line section selected in step S3 as the load side section from the read division switch arrangement data. Extract the data. Specifically, the phase discrimination processing unit 112 has the selection section number S._curExtract data with the load side section number as. As a result, the phase discrimination processing unit 112 identifies the sensor built-in section switch 104 installed at the power supply end of the selective distribution line section.

Further, the phase discrimination processing unit 112 receives the circuit breaker measurement value data of the distribution line 101 to be discriminated from the distribution monitoring control master station 106 via the communication unit 115, and the sensor built-in division switch 104 identified in step S4. Section T of the measured value data of the section switch_sExtract the data in. The phase discrimination processing unit 112 is a measurement value I of the sending current of the R phase, the S phase, and the T phase in the extracted circuit breaker measurement value data._R, I_S, I_TAverage value (hereinafter sometimes referred to as "average current") I_Rm, I_Sm, I_TmTo be calculated respectively.

Further, the phase discrimination processing unit 112 determines the measured values I of the line currents of the A terminal, the B terminal, and the C terminal in the extracted division switch measurement value data._A, I_B, I_CAverage value I_Am, I_Bm, I_CmTo be calculated respectively.

Then, the phase discrimination processing unit 112 determines the average value I of the line currents of the A terminals._AmAnd the average current I of R phase, S phase and T phase_Rm, I_Sm, I_TmOf the R phase, S phase, and T phase, the average current value is the average value I of the line current of the A terminal._AmThe phase having the value closest to is the phase of the A terminal. Next, the phase discrimination processing unit 112 determines the average value I of the line currents of the B terminals._BmAnd the average current of the remaining two phases excluding the phase of the A terminal are compared with each other, and the average current value is the average value I of the line current of the B terminal._BmThe phase closer to is the phase of the B terminal, and the last remaining phase is the phase of the C terminal.

For example, the average value I of the line current of the A terminal_AmAnd the average current I of R phase, S phase and T phase_Rm, I_Sm, I_TmAs a result of comparing with each other, the average current I of the R phase_RmHowever, the average value of the line current of the A terminal I_AmIf it is the closest to, the R phase is the phase of the A terminal. Next, the average value I of the line current of the B terminal_BmAnd the average current I of the S phase and T phase, which are the remaining two phases excluding the phase used as the A terminal phase._Sm, I_TmAnd compare with each other. As a result, the average current I of the S phase_SmIs the average value of the line current of the B terminal I_BmIf it is close to, the S phase is the B terminal phase, and the last remaining T phase is the C terminal phase. The phase order is determined in this way.

The phase discrimination processing unit 112 SPs each of the phases corresponding to the terminals A, B, and C, that is, the R phase, the S phase, and the T phase, according to the result of determining the phase order._A, SP_B, SP_CIs stored in the data storage unit 113.

Further, the phase discrimination processing unit 112 outputs the phase of each terminal of A, B, and C to PA in order to output the phase order determination result of the sensor built-in division switch 104._SW, PB_SW, PC_SWIs stored in the data storage unit 113. Here, the subscript "SW" represents the division switch number of the sensor built-in division switch 104.

In step S5, the phase discrimination processing unit 112 totals the power consumption of the low-voltage consumer who receives the single-phase supply within the selective distribution line section selected in step S3 for each distribution transformer 107. Low-voltage consumers who receive single-phase supply are connected to a single-phase three-wire or three-phase four-wire distribution transformer 107.

Specifically, the phase discrimination processing unit 112 receives the selection section number S, which is the distribution line section number of the selection distribution line section selected in step S3 from the data storage unit 113._curTo read. Further, the phase discrimination processing unit 112 reads the distribution transformer arrangement data and the distribution transformer equipment data from the data storage unit 114. Then, the read phase discrimination processing unit 112 receives the selection section number S from the distribution transformer arrangement data and the distribution transformer equipment data._curExtract the distribution transformer number that is included in the distribution line section corresponding to and whose phase line type is a single-phase three-wire type or a three-phase four-wire type.

Next, the phase discrimination processing unit 112 reads the low-voltage consumer supply equipment data from the data storage unit 114, and from the read low-voltage consumer supply equipment data, for each distribution transformer number extracted earlier, in a single phase. Extract the smart meter 108 installed in the consumer to be supplied. Next, the phase discrimination processing unit 112 has a time cross section T from the data storage unit 113._sIs read, and the smart meter measurement value data is read from the automatic meter reading master station 109 via the communication unit 115. Then, the phase discrimination processing unit 112 has a time cross section T for each of the extracted smart meters 108._sThe amount of power in is calculated as the amount of power consumption. Time cross section T_SThe method of obtaining the electric energy in the inside is as described in the smart meter measurement value data.

Next, the phase discrimination processing unit 112 totals the power consumption obtained for each smart meter 108 for each distribution transformer number, and the power consumption W._mIs stored in the data storage unit 113. Here, the subscript "m" is assumed to satisfy m {single-phase three-wire system or three-phase four-wire system distribution transformer number in the selected distribution line section}.

In step S6, the phase discrimination processing unit 112 totals the electric energy consumption of the consumer who receives the supply in the three phases within the selective distribution line section selected in step S3. Among the low-voltage consumers, the consumers who receive the supply in three phases are the consumers whose supply method is three-phase and all the high-voltage consumers.

Specifically, the phase discrimination processing unit 112 receives the selection section number S, which is the distribution line section number of the selection distribution line section selected in step S3 from the data storage unit 113._curIs read, and the distribution transformer arrangement data and the distribution transformer equipment data are read from the data storage unit 114. Then, the phase discrimination processing unit 112 selects the selected section number S from the read distribution transformer arrangement data and distribution transformer equipment data._curExtract the distribution transformer number that is included in the distribution line section corresponding to and whose phase line type is a three-phase three-wire type or a three-phase four-wire type.

Next, the phase discrimination processing unit 112 reads the low-voltage consumer supply equipment data from the data storage unit 114, and from the read low-voltage consumer supply equipment data, receives data including any of the distribution transformer numbers extracted earlier. Extract. The phase discrimination processing unit 112 extracts a meter number from the extracted data and creates a list. Since the meter number extracted here is the meter number of the smart meter 108 installed in the customer who receives the supply in three phases, the list created here is installed in the customer who receives the supply in three phases. This is a three-phase smart meter list, which is a list of smart meters 108.

Next, the phase discrimination processing unit 112 reads the high-voltage consumer supply equipment data from the data storage unit 114, and from the read high-voltage consumer supply equipment data, the selection section number S_curExtract data containing. The phase discrimination processing unit 112 extracts the meter number from the extracted data. The meter number extracted here is the selected section number S._curIt is a meter number of the smart meter 108 installed in the customer included in the distribution line section corresponding to. The phase discrimination processing unit 112 adds the extracted meter number to the previously created three-phase smart meter list.

Next, the phase discrimination processing unit 112 has a time cross section T from the data storage unit 113._sTo read. Then, the phase discrimination processing unit 112 reads the smart meter measurement value data from the automatic meter reading master station 109 via the communication unit 115, and has a time cross section T for the smart meter 108 of each meter number in the three-phase smart meter list._sFind the amount of power in. Time cross section T_sThe method of obtaining the electric energy in the inside is as described in the smart meter measurement value data.

Next, the phase discrimination processing unit 112 adds up the electric energy obtained for each smart meter 108, and may be referred to as the electric energy consumption of the consumer who receives the supply in three phases (hereinafter referred to as "the total electric energy consumption of the three-phase load"). Yes) W_pAs a result, it is stored in the data storage unit 113.

In step S7, the phase discrimination processing unit 112 creates a list of combinations of the phase order of the connection terminals of the sensor built-in section switch 104 installed at the load end of the selective distribution line section selected in step S3. Specifically, the phase discrimination processing unit 112 receives the selection section number S, which is the distribution line section number of the selection distribution line section selected in step S3 from the data storage unit 113._curIs read, and the division switch arrangement data is read from the data storage unit 114. Then, from the read division switch arrangement data, the phase discrimination processing unit 112 determines that the power supply side section is the selection section number S._curThe sensor built-in section switch 104, which is the distribution line section corresponding to the above, is extracted. Further, the phase discrimination processing unit 112 enumerates all the correspondences between the terminals A, B, and C of the extracted sensor built-in division switch 104 and the phases R, S, and T, and lists the phase order combination list L._PIs stored in the data storage unit 113.

For example, the selected interval number S_curWhen there is only one sensor built-in section switch 104 installed at the load end of the distribution line section corresponding to, the number of combinations of A terminal, B terminal and C terminal in phase order is RST, STR, TRS. , RTS, TSR, SRT. Selection section number S_curIf there are two sensor built-in section switches 104 installed at the load end of the distribution line section corresponding to, each sensor built-in section switch 104 has 6 combinations of phase order, so the phase order The total number of combinations is 36 (= 6 × 6).

In step S8, the phase discrimination processing unit 112 selects the phase order combination list L created in step S7._PSelect the first combination from. Specifically, the phase discrimination processing unit 112 from the data storage unit 113 tells the phase order combination list L._PAnd select the first combination according to the order listed when creating the list.

Then, based on the selected combination, the phase discrimination processing unit 112 of A, B, and C of the sensor built-in section switch 104 installed at the load end of the distribution line section among the R phase, S phase, and T phase. The phase corresponding to each terminal is RP._Ai, RP_Bi, RP_CiIs stored in the data storage unit 113. Here, the subscript "i" is assumed to satisfy i {sensor built-in section switch installed at the load end of the selected distribution line section}.

In step S9, the phase discrimination processing unit 112 is effective for the selective distribution line section selected in step S3, when the phase order of the load ends is the combination selected in step S8, which is consumed between each phase in the section. Obtain the amount of power (hereinafter sometimes referred to as "power consumption between each phase").

Specifically, the phase discrimination processing unit 112 uses the section switch measurement data to view each of the load-side section switches 104 with a built-in sensor installed at the power supply end of the selective distribution line section selected in step S3. Active power between phases WS_RS, WS_ST, WS_TRIs calculated. Further, the phase discrimination processing unit 112 is the active power amount WR between each phase on the load side when viewed from each sensor built-in section switch 104 installed at the load end of the selective distribution line section selected in step S3._RSi, WR_STi, WR_TRiIs calculated. Power consumption W of the load between each phase in the selective distribution line section_RS, W_ST, W_TRIs the calculated active power WS_RS, WS_ST, WS_TR, WR_RSi, WR_STi, WR_TRiCan be obtained according to the following equations (1) to (3).

<maths num="1"></maths>

<maths num="2"></maths>

<maths num="3"></maths>

Next, the amount of active power WS between each phase in the distribution line section_RS, WS_ST, WS_TRI will explain the specific method of obtaining. As a procedure, first, the phase discrimination processing unit 112 determines each line voltage and line current on the load side of the sensor built-in division switch 104 based on the measurement value data of the division switch and the correspondence between the terminal and the phase. Ask. The phase discrimination processing unit 112 obtains the load current between each phase from the obtained line current. Further, the phase discrimination processing unit 112 obtains the active power at each measurement time from the phase difference between the line voltage and the load current between each phase. The amount of active power is obtained by adding these up and multiplying by the measurement cycle.

Specifically, first, the phase discrimination processing unit 112 has a time cross section T from the data storage unit 113._sTo read. Further, the phase discrimination processing unit 112 has a time cross section T of the sensor built-in switch 104 installed at the power supply end of the selective distribution line section selected in step S3 from the power distribution monitoring control master station 106 via the communication unit 115._sRead the measured value data in.

Next, the phase discrimination processing unit 112 receives the phase SP corresponding to each terminal of A, B, and C of the sensor built-in division switch 104 from the data storage unit 113._A, SP_B, SP_CTo read. Then, the phase discrimination processing unit 112 associates the terminals with each other and sets the line voltage value V between the terminals a, b, and c in the divided switch measurement value data._ab, V_bc, V_caAnd the value of the line current of each terminal of a, b, and c I_a, I_{b b}, I_cBased on, the line voltage V between each phase of R, S, T_RS, V_ST, V_TRAnd the line current I of each phase of R, S, T_R, I_S, I_TAnd decide.

For example, the phase SP corresponding to the A terminal_AIs the R phase, and the phase SP corresponding to the B terminal_BIs the S phase, and the phase SP corresponding to the C terminal_CIs the T-phase, the line voltage V between the R-phase and the S-phase_RSIs the line voltage V between the a terminal and the b terminal._abIs the value of. Further, the line voltage V between the S phase and the T phase._STIs the line voltage V between the b terminal and the c terminal._bcIs the value of. Also, the line voltage V between the T phase and the R phase._TRIs the line voltage V between the c terminal and the a terminal._caIs the value of. Also, the R-phase line current I_RIs the line current I of terminal a_aIs the value of. Also, the S-phase line current I_SIs the line current I of terminal b_{b b}Is the value of. Also, the T-phase line current I_TIs the line current I of the c terminal_cIs the value of.

FIG. 4 is a diagram showing the relationship between the line current vector of each phase and the load current vector between each phase. In FIG. 4, assuming that there is no ground fault current and the sum of the line current vectors of the R, S, and T phases and the sum of the load current vectors between the phases are zero (0), each phase of the R, S, and T. Line current vector of &lt;I_R&gt;, &lt;I_S&gt;, &lt;I_TThe load current vector between each phase is represented by &lt;I&gt;._RS&gt;, &lt;I_ST&gt;, &lt;I_TRIt is represented by&gt;. From the following equations (4) to (8), the linear current vector &lt;I of each phase_R&gt;, &lt;I_S&gt;, &lt;I_T&gt; And the load current vector between each phase &lt;I_RS&gt;, &lt;I_ST&gt;, &lt;I_TRThe relationship of&gt; is as shown in FIG.

<maths num="4"></maths>

<maths num="5"></maths>

<maths num="6"></maths>

<maths num="7"></maths>

<maths num="8"></maths>

As shown in FIG. 4, three load current vectors &lt;I_RS&gt;, &lt;I_ST&gt;, &lt;I_TRThe intersection of&gt; is the three line current vectors &lt;I_R&gt;, &lt;I_S&gt;, &lt;I_TIt is the center of gravity of the triangle consisting of&gt;. Therefore, the load current I between each phase_RS, I_ST, I_TRThe value of can be calculated by the following equations (9) to (11).

<maths num="9"></maths>

<maths num="10"></maths>

<maths num="11"></maths>

Further, from FIG. 4, three line current vectors &lt;I_R&gt;, &lt;I_S&gt;, &lt;I_TConsidering a triangle consisting of&gt;, the R-phase linear current vector &lt;I_RSide and S-phase line current vector &lt;I_SFrom the law of cosines, the cosine of the angle α formed by the side of&gt; is shown in the following equation (12).

<maths num="12"></maths>

Load current vector between R phase and S phase &lt;I_RS&gt; Is the R-phase linear current vector &lt;I_RSide and S-phase linear current vector &lt;I_SThe angle α formed by the side of&gt; is bisected. Therefore, from the half-angle formula of trigonometric function, the R-phase linear current vector &lt;I_R&gt; And the load current vector between the R phase and the S phase &lt;I_RSPhase difference θ with&gt;_RThe cosine and sine of can be calculated as shown in the following equations (13) and (14), respectively.

<maths num="13"></maths>

<maths num="14"></maths>

For example, the phase SP corresponding to the A terminal of the sensor built-in section switch 104._AIs the R phase, and the phase SP corresponding to the B terminal_BIs the S phase, and the phase SP corresponding to the C terminal_CConsider the case where is the T phase. In this case, the line voltage V between the a terminal and the b terminal._abAnd the line current I of terminal a_aPhase difference between_aIs the line voltage V between the R phase and the S phase._RSAnd the R-phase line current I_RIt becomes the phase difference with. Line voltage V between R phase and S phase_RSAnd the load current I between the R phase and the S phase_RSPhase difference with θ_RSThen, from the above equations (13) and (14) and the addition theorem of trigonometric functions, the power factor cosθ of the load between the R phase and the S phase._RSCan be calculated as shown in the following equation (15).

<maths num="15"></maths>

Power factor cosθ obtained by equation (15)_RSCosθ, depending on the combination of terminal and phase_ST, Cosθ_TRIn some cases.

Load current vector between each phase &lt;I_RS&gt;, &lt;I_ST&gt;, &lt;I_TR&gt; The phase difference between each phase is the load current I between each phase using the cosine theorem._RS, I_ST, I_TRIt can be calculated from the value of. Similarly, assuming that there is no ground fault current and the sum of the line voltage vectors is zero (0), the line voltage vector is set to &lt;V._RS&gt;, &lt;V_ST&gt;, &lt;V_TRRepresented by&gt;, each line voltage vector &lt;V_RS&gt;, &lt;V_ST&gt;, &lt;V_TR&gt; The phase difference between each line is the voltage V between each line._RS, V_ST, V_TRIt can be calculated from the value of. As mentioned above, one of the power factors between the three phases, eg cosθ_RSIs calculated, so the remaining cosθ_ST, Cosθ_TRCan also be calculated from the addition theorem of trigonometric functions.

Therefore, the active power P of the load of each phase_RS, P_ST, P_TRCan be calculated as shown in the following equations (16) to (18).

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<maths num="17"></maths>

<maths num="18"></maths>

From the above, the time cross section T_sThe active power of the load of each phase at each measurement time t in_RSt, P_STt, P_TRtAssuming that the measurement cycle of the sensor built-in section switch 104 is k, the power consumption WS, which is the active power consumed by the load of each phase._RS, WS_ST, WS_TRCan be calculated by the following equations (19) to (21).

<maths num="19"></maths>

<maths num="20"></maths>

<maths num="21"></maths>

Effective electric energy WR between each phase on the load side when viewed from each sensor built-in section switch 104 installed at the load end of the selective distribution line section._RSi, WR_STi, WR_TRiIs the value V of the line voltage between each terminal of A, B, and C in the divided switch measurement value data._AB, V_BC, V_CA, A, B, C terminal line current value I_A, I_B, I_C, And the line voltage V between terminal A and terminal B_ABAnd the line current I of terminal A_APhase difference between_AThe amount of active power between each phase on the load side when viewed from the sensor built-in section switch 104 installed at the power supply end of the above-mentioned selective distribution line section._RS, WS_ST, WS_TRIt can be calculated by the same procedure as the method of obtaining.

As described above, the amount of active power WS between each phase in the selective distribution line section_RS, WS_ST, WS_TR, WR_RSi, WR_STi, WR_TRiAfter obtaining the above equations (1) to (3), the power consumption of the load between each phase in the selective distribution line section (hereinafter, may be referred to as "load power consumption in the section") W._RS, W_ST, W_TRIs calculated and stored in the data storage unit 113. When the power consumption between each phase in the selective distribution line section is calculated in this way, the process proceeds to step S10 of the flowchart shown in FIG.

In step S10, the phase discrimination processing unit 112 is included in the selective distribution line section selected in step S3, and is a distribution transformer that supplies the consumer with a single phase (hereinafter, may be referred to as a single-phase transformer). For 107, a phase combination list (hereinafter referred to as connection phase combination list) in which each single-phase transformer 107 is connected to the distribution line 101 is created.

Specifically, the phase discrimination processing unit 112 first receives the selection section number S, which is the distribution line section number of the selection distribution line section selected in step S3, from the data storage unit 113._curTo read. Further, the phase discrimination processing unit 112 reads the distribution transformer arrangement data and the distribution transformer equipment data from the data storage unit 114. Then, the phase discrimination processing unit 112 selects the selected section number S from the read distribution transformer arrangement data and distribution transformer equipment data._curThe distribution transformer number of the distribution transformer 107, which is included in the distribution line section corresponding to the above and whose phase line type is a single-phase three-wire type or a three-phase four-wire type, is extracted.

Next, the phase discrimination processing unit 112 uses the extracted distribution transformer number as a group of RS phase connection in which the R phase and the S phase are connected, and a group of the ST phase connection in which the S phase and the T phase are connected. , And all combinations that divide the T-phase and R-phase into groups of TR-phase connections are listed. Then, the phase discrimination processing unit 112 sets the list L of all combinations._CIs created as a connection phase combination list and stored in the data storage unit 113.

For example, if the selective distribution line section includes 20 distribution transformers 107 whose phase wires are single-phase three-wire or three-phase four-wire, the number of all combinations is 20 of 3. Ride (3²⁰). When the connection phase combination list is created in this way, the process proceeds to step S11.

In step S11, the phase discrimination processing unit 112 selects the first combination from the connection phase combination list created in step S10. Specifically, the phase discrimination processing unit 112 receives the connection phase combination list L from the data storage unit 113._CIs read, and the read connection phase combination list L_CFrom, select the first combination according to the order listed when creating the list. The phase discrimination processing unit 112 sets the set of distribution transformers 107 for RS phase connection to G based on the selected combination._RSThen, the set of distribution transformers 107 for ST phase connection is G._STThen, the set of distribution transformers 107 for TR phase connection is G._TRAs a result, it is stored in the data storage unit 113.

In step S12, the phase discrimination processing unit 112 determines the power consumption of the intra-section load obtained from the divided switch measurement value data and the power consumption of the intra-section load obtained from the smart meter measurement value data for the selective distribution line section. Calculate the degree of divergence from. Then, the phase discrimination processing unit 112 uses the calculated degree of divergence as an index value of whether or not the combination of the phase order selected in step S8 and the combination of the connected phases selected in step S11 are the correct combination.

Specifically, the phase discrimination processing unit 112 first sets the distribution transformer number for each connection phase from the data storage unit 113 (hereinafter, may be referred to as transformer group) G._RS, G_ST, G_TRAnd the power consumption W of each distribution transformer 107_mAnd read. Next, the phase discrimination processing unit 112 collects the power consumption of the single-phase load for each connection phase (hereinafter, may be referred to as single-phase load power consumption) WL._RS, WL_ST, WL_TRTo ask. Single-phase load power consumption of each connection phase WL_RS, WL_ST, WL_TRCan be calculated as shown in the following equations (22) to (24), respectively. Here, WL_RSRepresents the single-phase load power consumption when the R phase and the S phase are connected, and WL_STRepresents the single-phase load power consumption when the S phase and the T phase are connected, and WL_TRRepresents the single-phase load power consumption when the T-phase and the R-phase are connected.

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<maths num="23"></maths>

<maths num="24"></maths>

Next, the phase discrimination processing unit 112 determines the total power consumption W of the three-phase load obtained from the measured value data of the smart meter 108 from the data storage unit 113._pAnd the load power consumption W in the section obtained from the measured value data of the sensor built-in section switch 104._RS, W_ST, W_TRAnd are read, and the degree of divergence D is calculated based on the following equation (25).

<maths num="25"></maths>

Then, the phase discrimination processing unit 112 uses the deviation degree D calculated based on the equation (25) as the deviation degree value D with respect to the combination c of the connection phases._cIs stored in the data storage unit 113.

In step S13, the phase discrimination processing unit 112 determines whether or not the end of the connection phase combination list created in step S10 has been reached. If the phase discrimination processing unit 112 determines in step S13 that the end of the connection phase combination list has been reached, the process proceeds to step S15, and if it determines that the end of the connection phase combination list has not been reached, the phase determination processing unit 112 proceeds to step S15. , Step S14.

In step S14, the phase discrimination processing unit 112 selects the next combination of connection phases from the connection phase combination list created in step S10. Specifically, the phase discrimination processing unit 112 receives the connection phase combination list L from the data storage unit 113._CIs read, and the read connection phase combination list L_CSelect the next combination of the currently selected combination according to the order listed when creating the list.

Next, the phase discrimination processing unit 112 stores the transformer group G of each phase stored in the data storage unit 113._RS, G_ST, G_TRRemoved and added a new set of distribution transformers for RS phase connection based on the newly selected combination of connection phases._RSThen, the set of ST-phase connection distribution transformers is a new G._STThen, the set of distribution transformers connected in TR phase is a new G._TRAs a result, it is stored in the data storage unit 113. After the process of step S14 is completed, the process returns to step S12.

In step S15, the phase discrimination processing unit 112 receives the deviation degree value D for each combination of connected phases from the data storage unit 113._COf these, the degree of deviation value D_cThe minimum value of and the degree of deviation value D_cTransformer group G for each phase when_RS, G_ST, G_TRAnd ask. Then, the phase discrimination processing unit 112 determines the degree of deviation value D._cMinimum value of and transformer group G of each phase_RS, G_ST, G_TRAnd, the degree of divergence D with respect to the combination p of the selected phase order_p, And connection phase combination G_RSp, G_STp, G_TRpAs a result, it is stored in the data storage unit 113.

In step S16, the phase discrimination processing unit 112 determines whether or not the end of the phase order combination list created in step S7 has been reached. If the phase discrimination processing unit 112 determines in step S16 that the end of the phase order combination list has been reached, the process proceeds to step S18, and if it determines that the end of the phase order combination list has not been reached, the phase discrimination processing unit 112 proceeds to step S18. , Step S17.

In step S17, the phase discrimination processing unit 112 selects the next combination from the phase order combination list created in step S7. Specifically, the phase discrimination processing unit 112 from the data storage unit 113 tells the phase order combination list L._PAnd select the next combination of the currently selected combination according to the order listed when creating the list. The phase discrimination processing unit 112 is a phase RP corresponding to each terminal of A, B, and C from the data storage unit 113._Ai, RP_Bi, RP_CiTo delete.

Then, based on the selected combination, the phase discrimination processing unit 112 of A, B, and C of the sensor built-in section switch 104 installed at the load end of the distribution line section among the R phase, S phase, and T phase. New RP for each phase corresponding to each terminal_Ai, RP_Bi, RP_CiIs stored in the data storage unit 113. Here, the subscript "i" is assumed to satisfy i {sensor built-in section switch installed at the load end of the selected distribution line section}. After completing the process of step S17, the process returns to step S9 shown in FIG.

In step S18, the phase discrimination processing unit 112 sets the phase order of the connection phases of the sensor built-in division switch 104 installed at the load end of the selected distribution line section, and the connection phase of each distribution transformer in the same section. Ask for. Specifically, the phase discrimination processing unit 112 deviates from the data storage unit 113 with respect to the combination p of each phase order created in step S7._p, And connection phase combination G_RSp, G_STp, G_TRpIs read, and the degree of divergence D_pFind the combination p of the phase order that minimizes.

Next, the phase discrimination processing unit 112 has a divergence degree D._pConnection phase combination G with respect to the phase order combination p that minimizes_RSp, G_STp, G_TRpThe combination G of the connection phases in the distribution transformer 107 for single-phase load supply included in the selected distribution line section._RSs, G_STs, G_TRsIs stored in the data storage unit 113. Here, the subscript "s" represents the distribution line section number of the selected distribution line section.

Next, the phase discrimination processing unit 112 has a divergence degree D._pFrom the combination p of the phase order that minimizes, the phase corresponding to each connection terminal of A, B, C of the sensor built-in section switch 104 installed at the load end of the selected distribution line section is set to PA._SW, PB_SW, PC_SWIs stored in the data storage unit 113. Here, the subscript "SW" represents the division switch number of the sensor built-in division switch 104.

In step S19, the phase discrimination processing unit 112 determines whether or not the distribution line section list created in step S2 is empty. If the phase discrimination processing unit 112 determines in step S19 that the distribution line section list is empty, the process proceeds to step S22, and if it is determined that the distribution line section list is not empty, the step Move to S20.

In step S20, the phase discrimination processing unit 112 selects a section adjacent to the load side of the section where the processing up to step S18 has been completed as the next distribution line section from the distribution line section list created in step S2. Specifically, the phase discrimination processing unit 112 first receives the distribution line section list L from the data storage unit 113._secIs read, and the division switch arrangement data is read from the data storage unit 114. Then, in the phase discrimination processing unit 112, among the read division switch arrangement data, the distribution line section corresponding to the load side section number is the distribution line section list L._secSelect only the data contained in. In the phase discrimination processing unit 112, the distribution line section corresponding to the power supply side section number is included in the distribution line section list L from the selected division switch arrangement data._secExtract data that is not included in. Then, the phase discrimination processing unit 112 selects the load side section number of the extracted data, and the selected section number S_curIs stored in the data storage unit 113.

Further, the phase discrimination processing unit 112 includes a distribution line section list L of the data storage unit 113._secDeletes the selected distribution line section number from. After the process of step S20 is completed, the process proceeds to step S21.

In step S21, the phase discrimination processing unit 112 obtains a phase corresponding to each terminal of the sensor built-in section switch 104 installed at the power supply end of the selective distribution line section selected in step S20. Specifically, the phase discrimination processing unit 112 first receives the selection section number S from the data storage unit 113._curAnd the phase order determination result PA of the sensor built-in division switch 104_SW, PB_SW, PC_SWAnd read. Next, the phase discrimination processing unit 112 receives the phase SP corresponding to each terminal of A, B, and C from the data storage unit 113._A, SP_B, SP_CTo delete. Then, the phase discrimination processing unit 112 reads the read phase order determination result PA._SW, PB_SW, PC_SWFrom, the distribution line section number is the selected section number S_curExtract the one that matches with, and set the phase corresponding to each terminal to a new SP._A, SP_B, SP_CIs stored in the data storage unit 113. After the process of step S21 is completed, the process returns to step S5 shown in FIG.

In step S22, the phase discrimination processing unit 112 outputs the result of phase discrimination by the output unit 116. Specifically, the phase discrimination processing unit 112 first receives the phase order determination result PA of the sensor built-in division switch 104 from the data storage unit 113._SW, PB_SW, PC_SWAnd the combination G of the connection phases of the distribution transformer 107 for single-phase load supply included in each distribution line section._RSs, G_STs, G_TRsTo read. Next, the phase discrimination processing unit 112 reads the read phase order determination result PA._SW, PB_SW, PC_SWThe output unit 116 outputs the division switch number and the phase to which the terminals A, B, and C of the sensor built-in division switch 104 corresponding to the division switch number are connected.

Next, the phase discrimination processing unit 112 determines the combination G of the read connection phases._RSs, G_STs, G_TRsOutputs a list of distribution transformer numbers connected to the RS phase, a list of distribution transformer numbers connected to the ST phase, and a list of distribution transformer numbers connected to the TR phase. Output by 116. For example, if a three-phase four-wire distribution transformer is output as a distribution transformer connected to the RS phase, this output content is connected to the three-phase four-wire distribution transformer. It indicates which of the three phases is supplied to the single-phase load.

As described above, according to the present embodiment, the current information and voltage information of the distribution wire 101 measured by the sensor built-in section switch 104 in the time section selected by the time section selection unit 111, and the smart in the time section. Phase discrimination based on the power consumption information of the consumer measured by the meter 108, the distribution system configuration information stored in the data storage unit 114, the equipment information of the distribution transformer 107, and the supply equipment information of the consumer. The processing unit 112 determines the connection phase of the distribution transformer 107.

The current information and voltage information of the distribution line 101 are information of measured values measured by the sensor built-in section switch 104 to control the continuity of the distribution line 101. Further, the power consumption information of the consumer is the information of the measured value measured by the smart meter 108 for notifying the automatic meter reading master station 109.

Since the connection phase of the distribution transformer 107 is determined using these measured value information, a means for measuring the current and voltage of the distribution line 101 and the like in order to determine the connection phase of the distribution transformer 107, and There is no need to add a new means to measure the power consumption of consumers to the distribution equipment. Also, the worker does not have to go to the demand point to determine the connection phase.

Specifically, in the present embodiment, the original power distribution system such as the current information and voltage information of the distribution line 101 measured by the sensor built-in section switch 104 and the power consumption information of the consumer measured by the smart meter 108. It is possible to determine from which phase power is supplied to the single-phase load by using only the information measured in. As a result, it is not necessary to provide a special mechanism for phase discrimination for each huge number of consumers or distribution transformers 107. In addition, the operator does not have to go to the installation location of the distribution transformer 107 to determine the phase.

Therefore, the connection phase of the distribution transformer 107 can be easily determined without increasing the cost of the distribution equipment and the work load of the operator. As a result, the connection phase of the load can be easily determined without increasing the cost of the distribution equipment and the workload of the operator. In other words, it is possible to easily determine which phase each load is connected to while suppressing the installation cost of the distribution equipment and the amount of work of the operator.

Further, in the present embodiment, as shown in the above-mentioned flowcharts of FIGS. 2 and 3, the phase discrimination processing unit 112 has the power consumption amount of the load in the section obtained from the divided switch measurement value data and the smart meter measurement value. The connection phase of each distribution transformer 107 is determined by obtaining the combination of the connection phases of the plurality of distribution transformers 107 so that the power consumption of the load in the section obtained from the data is closest to the power consumption. ..

That is, the phase discrimination processing unit 112 first obtains the amount of power consumed by the load in each distribution line section for each phase of the multi-phase AC power based on the divided switch measurement value data. Then, the phase discrimination processing unit 112 consumes the power consumption for each phase in each distribution line section obtained from the divided switch measurement value data and the consumption for each phase in each distribution line section obtained from the smart meter measurement value data. The connection phase of each distribution transformer 107 is determined by obtaining the combination of the connection phases of the plurality of distribution transformers 107 so as to be closest to the electric energy.

By doing so, it is possible to easily realize the phase discrimination device 110 capable of discriminating the connection phase of each distribution transformer 107.

Further, in the present embodiment, the current information, voltage information and phase of the distribution line 101 measured by the sensor built-in section switch 104 are used as information representing the distribution line measurement value which is the measurement result of the electrical characteristics of the multi-phase AC power. Information is used. That is, as the distribution line measurement values, all the measurement values of the current, voltage, and phase difference of the multi-phase AC power are used.

The current information is information representing the measured value of the current of the multi-phase AC power, specifically, the effective value of each line current of the distribution line 101 connected to the sensor built-in section switch 104. The voltage information is information representing the measured value of the voltage of the multi-phase AC power, specifically, the effective value of the voltage between each line of the distribution line 101 connected to the sensor built-in section switch 104. The phase information is information representing the phase difference of the multi-phase AC power, specifically, the phase difference between the line current and the line voltage of the distribution line 101 connected to the sensor built-in section switch 104.

&lt;Second embodiment&gt; Next, the phase discrimination device according to the second embodiment of the present invention will be described. Since the phase discriminating device of the present embodiment has the same configuration as the phase discriminating device 110 of the first embodiment shown in FIG. 1, the same reference numerals are attached to the same configurations. And common explanations are omitted.

In the present embodiment, the time section selection unit 111 selects a plurality of time sections. Further, the output unit 116 outputs only the discrimination result of the distribution transformer 107 in which the phase discrimination results are the same among the plurality of time cross sections selected by the time cross section selection unit 111.

The operation of the phase discrimination device 110 according to the second embodiment of the present invention will be specifically described. 5 and 6 are flowcharts showing a processing procedure of the phase discrimination apparatus 110 relating to the phase discrimination processing according to the second embodiment of the present invention. Since the flowcharts shown in FIGS. 5 and 6 are similar to the flowcharts shown in FIGS. 2 and 3, the same step numbers will be assigned to the same steps, and common description will be omitted. In the flowcharts shown in FIGS. 5 and 6, the process is started when the power of the phase discrimination device 110 is turned on, and the process proceeds to step S31 shown in FIG.

In step S31, the time section selection unit 111 selects a plurality of time sections to be subjected to phase discrimination, and the selected plurality of time sections are listed in the time section list L._TIs stored in the data storage unit 113. The individual time sections may be selected as one continuous period or as a collection of multiple discontinuous periods.

In step S32, the phase discrimination processing unit 112 receives the time cross-section list L from the data storage unit 113._TTo read. Then, the phase discrimination processing unit 112 reads the time cross-section list L._TFrom, the first time section is taken out according to the order selected in step S31, and the time section T_sIs stored in the data storage unit 113. Further, the phase discrimination processing unit 112 has a time cross-section list L stored in the data storage unit 113._TDeletes the selected time section from.

After the processing of step S32 is completed, the phase discrimination processing unit 112 performs the processing of steps S2 to S21 in the same manner as in the first embodiment described above. In the present embodiment, when the phase discrimination processing unit 112 determines in step S19 that the distribution line section list is empty, the process proceeds to step S33.

In step S33, the phase discrimination processing unit 112 stores the result of the phase discrimination processing in the selected time cross section in the data storage unit 113, and determines whether or not the unprocessed time cross section remains. In other words, the phase discrimination processing unit 112 determines whether or not the end of the time cross-section list created in step S31 has been reached. If the phase discrimination processing unit 112 determines in step S33 that no unprocessed time section remains, in other words, if it determines that the end of the time section list has not been reached, the process proceeds to step S34. When the phase discrimination processing unit 112 determines that an unprocessed time cross section remains, in other words, when it determines that the end of the time cross section list has been reached, the process proceeds to step S35.

Specifically, the phase discrimination processing unit 112 first receives the phase order determination result PA of the sensor built-in division switch 104 from the data storage unit 113._SW, PB_SW, PC_SW, And the connection phase combination G of the distribution transformer for single-phase load supply included in each distribution line section._RSs, G_STs, G_TRsTo read. Then, the phase discrimination processing unit 112 selects these read data in the time section T currently selected._sIn association with PA_SWT, PB_SWT, PC_SWTAnd G_RSsT, G_STsT, G_TRsTIs stored in the data storage unit 113. Here, the subscript "T" represents the associated time cross section.

Next, the phase discrimination processing unit 112 receives the phase order determination result PA from the data storage unit 113._SW, PB_SW, PC_SW, And the combination G of the connection phase_RSs, G_STs, G_TRsTo delete. Finally, the phase discrimination processing unit 112 from the data storage unit 113 tells the time cross-section list L._TTo determine if the end of the time section list has been reached. If the phase discrimination processing unit 112 determines that the end of the time section list has not been reached, the process proceeds to step S34, and if it determines that the end of the time section list has been reached, the phase determination processing unit 112 proceeds to step S35. ..

In step S34, the phase discrimination processing unit 112 receives the time cross-section list L from the data storage unit 113._TTo read. Then, the phase discrimination processing unit 112 reads the time cross-section list L._TFrom, the next time section of the currently selected time section is taken out according to the order selected in step S31, and the new section T_sThe data is overwritten and stored in the data storage unit 113. Further, the phase discrimination processing unit 112 has a time cross-section list L stored in the data storage unit 113._TDeletes the time section selected this time.

In step S35, the phase discrimination processing unit 112 outputs the phase discrimination result having the same result in each time cross section by the output unit 116. Specifically, the phase discrimination processing unit 112 first receives the phase order determination result PA of the sensor built-in division switch 104 for each time cross section from the data storage unit 113._SWT, PB_SWT, PC_SWTAnd the combination G of the connection phase of the distribution transformer 107 for single-phase load supply included in each distribution line section._RSsT, G_STsT, G_TRsTAnd read. Next, the phase discrimination processing unit 112 performs the phase order determination result PA in all time cross sections T._SWT, PB_SWT, PC_SWTWith respect to the division switch number SW having the same division switch number, the division switch number and the phase to which the terminals A, B, and C are connected are output by the output unit 116.

Next, the phase discrimination processing unit 112 is a combination G of connection phases of the distribution transformer 107 for single-phase load supply included in each distribution line section._RSsT, G_STsT, G_TRsTFrom, the distribution transformer number for which the same combination of connection phases is obtained in all time sections is extracted. The phase discrimination processing unit 112 outputs the extracted distribution transformer number and the connection phase of the distribution transformer 107 corresponding to the distribution transformer number by the output unit 116.

As described above, according to the present embodiment, the phase discrimination results for the distribution transformer 107 in which the phase discrimination is performed for each of the plurality of time cross sections and the same phase discrimination results are obtained in all the time cross sections are final. Phase discrimination result. As a result, the phase discrimination results for the sensor built-in section switch 104 and the distribution transformer 106 having low discrimination accuracy, such that the phase discrimination results differ depending on the selected time cross section, are excluded, and only the phase discrimination results with high accuracy are obtained. be able to.

&lt;Third embodiment&gt; Next, the phase discrimination device according to the third embodiment of the present invention will be described. Since the phase discriminating device of the present embodiment has the same configuration as the phase discriminating device 110 of the first embodiment shown in FIG. 1, the same reference numerals are attached to the same configurations. And common explanations are omitted.

In the present embodiment, the time section selection unit 111 selects the time section based on the power consumption of each distribution transformer 107. The time section selection unit 111 is realized by, for example, a CPU. The time section selection unit 111 is used for any period for performing phase discrimination based on the smart meter measurement value, the configuration information of the distribution system, the equipment information of the distribution transformer 107, and the supply equipment information of the consumer. Decide whether to use circuit breaker measurement data, section switch measurement data, and smart meter measurement data.

The operation of the phase discrimination device 110 according to the third embodiment of the present invention will be specifically described. 7 and 8 are flowcharts showing a processing procedure of the phase discrimination apparatus 110 relating to the phase discrimination processing according to the third embodiment of the present invention. Since the flowcharts shown in FIGS. 7 and 8 are similar to the flowcharts shown in FIGS. 2 and 3, the same step numbers are assigned the same step numbers, and common description will be omitted. In the flowcharts shown in FIGS. 7 and 8, the process is started when the power of the phase discrimination device 110 is turned on, and the process proceeds to step S2 shown in FIG.

In the present embodiment, the process proceeds to step S41 after the processing of steps S2 to S4 is completed in the same manner as in the first embodiment described above. In step S41, the phase discrimination processing unit 112 selects a time cross section to be used for phase discrimination. Specifically, the phase discrimination processing unit 112 first determines the power consumption of a low-voltage consumer who receives a single-phase supply within the distribution line section selected in step S3 for each distribution transformer 107 and a smart meter. Aggregate for each measurement time of 108. Based on the aggregation result, the phase discrimination processing unit 112 selects a time zone having the largest variation in power consumption among the distribution transformers 107 as a time cross section for the phase discrimination processing.

Specifically, the phase discrimination processing unit 112 receives the selection section number S, which is the distribution line section number of the distribution line section selected in step S3 from the data storage unit 113._curTo read. Further, the phase discrimination processing unit 112 reads the distribution transformer arrangement data and the distribution transformer equipment data from the data storage unit 114.

Then, the phase discrimination processing unit 112 selects the selected section number S from the read distribution transformer arrangement data and distribution transformer equipment data._curExtract the distribution transformer number that is included in the distribution line section corresponding to and whose phase line type is a single-phase three-wire type or a three-phase four-wire type. Low-voltage consumers who receive single-phase supply are connected to a single-phase three-wire or three-phase four-wire distribution transformer 107. Therefore, extracting a distribution transformer number for a single-phase three-wire system or a three-phase four-wire system extracts a distribution transformer 107 connected to a low-voltage consumer who receives a single-phase supply. Corresponds to that.

Next, the phase discrimination processing unit 112 reads the low-voltage consumer supply equipment data from the data storage unit 114. The phase discrimination processing unit 112 extracts a smart meter 108 installed in a customer who receives a single-phase supply for each distribution transformer number extracted from the read low-voltage consumer supply equipment data.

Next, the phase discrimination processing unit 112 reads the smart meter measurement value data for a predetermined period from the automatic meter reading master station 109 via the communication unit 115. The predetermined period is, for example, the past one month. Then, the phase discrimination processing unit 112 obtains the power consumption amount within the predetermined period for each of the extracted smart meters 108. In other words, the phase discrimination processing unit 112 obtains the power consumption within the predetermined period for each of the extracted smart meters 108. The method of obtaining the power consumption within the predetermined period is as described in the smart meter measurement value data.

Next, the phase discrimination processing unit 112 totals the power consumption obtained for each smart meter 108 for each distribution transformer number and each measurement time, and the power consumption W._mtAnd. Here, the subscript "m" represents the transformer number for distribution, and the subscript "t" represents the measurement time of the smart meter measurement value data.

Next, the phase discrimination processing unit 112 consumes power W for each measurement time of the smart meter measurement value data._mtDispersion V_tTo ask. Finally, the phase discrimination processing unit 112 determines the dispersion V._tThe time cross section T is the minimum period that includes the time t and is the least common multiple of the measurement cycle of the sensor built-in section switch 104 and the measurement cycle of the smart meter._sIs selected and stored in the data storage unit 113.

Next, the processes of steps S5 to 22 are performed by the phase discrimination processing unit 112 in the same manner as in the first embodiment described above, and all the processing procedures are completed.

As described above, according to the present embodiment, the phase discrimination processing unit 112 determines the power consumption of the low-voltage consumer who receives the single-phase supply within the selective distribution line section for each distribution transformer 107 and smart. It is totaled for each measurement time of the meter 108, and based on the totaled result, the time zone in which the power consumption variation is the largest among the distribution transformers 107 is selected as the time cross section for the phase discrimination process.

Since the power consumption of each distribution transformer 107 varies within the determination period, there is a possibility that the connection phases of the distribution transformers 107 having similar power consumption may be determined alternately.

In the present embodiment, as described above, the power consumption is totaled for each distribution transformer 107 and each measurement time of the smart meter 108, and the time zone with the largest variation in power consumption is selected as the time cross section. It is possible to reduce the possibility of alternately determining the connection phases between the distribution transformers 107 having similar power consumption. Therefore, the accuracy of phase discrimination can be improved.

&lt;Fourth Embodiment&gt; Next, the phase discrimination device according to the fourth embodiment of the present invention will be described. Since the phase discriminating device of the present embodiment has the same configuration as the phase discriminating device 110 of the first embodiment shown in FIG. 1, the same reference numerals are attached to the same configurations. And common explanations are omitted.

In the present embodiment, it is known in advance that the data storage unit 114 does not replace the phases of the multi-phase AC power among the plurality of distribution line sections in which the distribution line 101 is divided. Data representing section information is stored, and the data is referred to in the phase discrimination process, and the phase order determination of the sensor built-in division switch 104 is omitted.

Specifically, the data storage unit 114 stores in-phase distribution line section data as known connection information of the distribution line in addition to the data described in the first embodiment described above. The in-phase distribution line section data is composed of a list of distribution line section numbers corresponding to the distribution line sections for which it is known in advance that the phases have not been replaced.

The operation of the phase discrimination device 110 according to the fourth embodiment of the present invention will be specifically described. 9 to 11 are flowcharts showing a processing procedure of the phase discrimination processing apparatus 110 relating to the phase discrimination processing according to the fourth embodiment of the present invention. Since the flowcharts shown in FIGS. 9 to 11 are similar to the flowcharts shown in FIGS. 2 and 3, the same step numbers will be assigned and common description will be omitted. In the flowcharts shown in FIGS. 9 to 11, when the power of the phase discrimination device 110 is turned on, the process is started, and the process proceeds to step S2 shown in FIG.

In the present embodiment, the process proceeds to step S51 after the processing of steps S1 to S6 is completed in the same manner as in the first embodiment described above. In step S51, the phase discrimination processing unit 112 reads the in-phase distribution line section data from the data storage unit 114, and the distribution line section number corresponding to the selected distribution line section is included in the in-phase distribution line section data. Judge whether or not.

When the phase discrimination processing unit 112 determines in step S51 that the distribution line section number corresponding to the selected distribution line section is not included in the in-phase distribution line section data, the phase is phased within the distribution line section. It is determined that there is a possibility that the replacement has been performed, and the process proceeds to step S7. When the phase discrimination processing unit 112 determines in step S51 that the distribution line section number corresponding to the selected distribution line section is included in the in-phase distribution line section data, the phase discrimination processing unit 112 determines that the phase is included in the distribution line section. It is determined that the replacement has not been performed, and the process proceeds to step S52 shown in FIG.

In step S52, the phase discrimination processing unit 112 loads the load of the distribution line section selected in step S3 from the connection phase of each terminal of the sensor built-in section switch 104 installed at the power supply end of the distribution line section selected in step S3. The connection phase of each terminal of the sensor built-in section switch 104 installed at the end is selected. Specifically, the phase discrimination processing unit 112 first receives the selection section number S, which is the distribution line section number corresponding to the distribution line section selected in step S3, from the data storage unit 113._curAnd the phase order determination result PA of the sensor built-in division switch 104_SW, PB_SW, PC_SWAnd read. Then, the phase discrimination processing unit 112 reads the read phase order determination result PA._SW, PB_SW, PC_SWFrom, the distribution line section number is the selected section number S_curExtract the ones that match. The phase discrimination processing unit 112 selects the phase of each terminal in the extracted phase order determination result as the phase order combination of the sensor built-in section switch 104 installed at the load end of the distribution line section as it is.

Then, the phase discrimination processing unit 112 corresponds to each terminal A, B, C of the sensor built-in section switch 104 installed at the load end of the selected distribution line section among the R phase, S phase, and T phase. , Each RP_Ai, RP_Bi, RP_CiIs stored in the data storage unit 113. Here, the subscript "i" is assumed to satisfy i {sensor built-in section switch installed at the load end of the selected distribution line section}.

When the phase order of the sensor built-in section switch 104 installed at the load end of the selective distribution line section is determined in this way, the process proceeds to step S53. Since the processes of steps S53 to S58 are the same as the processes of steps S9 to S14, a common description will be omitted.

In step S59, the phase discrimination processing unit 112 obtains the connection phase of each distribution transformer 107 in the selective distribution line section. Specifically, the phase discrimination processing unit 112 has a degree of deviation D from the data storage unit 113 with respect to each combination of connected phases._CIs read, and the degree of divergence D_cThe minimum value of and the transformer group G of each phase when the minimum value is taken._RS, G_ST, G_TRAnd ask. Then, the phase discrimination processing unit 112 is a transformer group G._RS, G_ST, G_TRCombination of the connection phases of the distribution transformer 107 for single-phase load supply included in the selected distribution line section G_RSs, G_STs, G_TRsIs stored in the data storage unit 113. Here, the subscript "s" represents the distribution line section number of the selected distribution line section.

Next, the phase discrimination processing unit 112 tells the data storage unit 113 that the phases corresponding to the terminals A, B, and C, that is, the combination RP in the phase order._Ai, RP_Bi, RP_CiTo read. Here, the subscript "i" is assumed to satisfy i {sensor built-in section switch installed at the load end of the selected distribution line section}. Then, the phase discrimination processing unit 112 RPs from the combination of the read phase order._Ai= PA_SW, RP_Bi= PB_SW, RP_Ci= PC_SWThe phases of the terminals A, B, and C of the sensor built-in section switch 104 installed at the load end of the selected distribution line section are set to PA._SW, PB_SW, PC_SWIs stored in the data storage unit 113. Here, the subscript "SW" represents the division switch number.

As described above, according to the present embodiment, data representing information of the distribution line section for which it is known in advance that the phases have not been replaced is stored in the data storage unit 114, and in the phase discrimination process. Refer to the relevant data. By utilizing the information of the distribution line section in which it is known in advance that the phases have not been replaced in this way, the phase order determination process for each distribution line section can be omitted. Therefore, the phase discrimination process can be efficiently executed.

100 distribution system control system, 101 distribution line, 102 distribution circuit breaker, 103 circuit breaker slave station, 104 sensor built-in division switch, 105 switch slave station, 106 distribution monitoring control master station, 107 distribution transformer, 108 smart Meter, 109 automatic meter reading master station, 110 phase discriminator, 111 time cross section selection unit, 112 phase discrimination processing unit, 113 data storage unit, 114 data storage unit, 115 communication unit, 116 output unit.