Transformer measurement terminal using phs, and low voltage line load monitor system using the

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a device and a system for monitoring the load from the secondary side of the pole transformer and the low voltage line to the consumer equipment.

【0002】

[Conventional technology]

In the conventional pole transformer, a transformer measurement terminal is installed for load management correlation measurement, and the secondary voltage and load current of the transformer (U-phase, V-phase, W-phase in the common lighting transformer), The ground line current is measured and the data is transmitted to the master station. A communication line such as an optical fiber or a communication cable is used for this data transmission. Therefore, it is necessary to lay a communication line, and there is a problem that the cost increases.

【0003】

Further, in the conventional correlation measurement (correlation data analysis between the amount of power used and the single-phase load current), a dedicated current measuring device is attached each time for measurement. However, there is a problem that it takes time to collect and analyze data at a plurality of measurement points because the measuring instrument is attached and removed each time.

【0004】

Furthermore, when voltage and current measurements were made from the low-voltage line to the consumer equipment, a dedicated voltage-current measuring device was attached to perform the measurement and data analysis each time. However, although it is good to measure the voltage and the current constantly, there is a problem that the data cannot be acquired by this method when the data and the information at the time of the occurrence of the abnormal voltage and the current are required.

【0005】

[Problems to be Solved by the Invention]

Therefore, an object to be solved by the present invention is to provide a low-voltage line load monitoring system that does not require the laying of a communication line and can collect voltage, load current, and ground line current in real time.

【0006】

[Means for solving problems]

In order to solve the above problems, the transformer measurement terminal device using the PHS of the present invention uses means for measuring or calculating data on the load from the secondary side of the pole transformer and the low voltage line to the consumer equipment, and the data thereof. It is equipped with a means for transmitting to the master station by PHS. Further, the low-voltage line load monitoring system of the present invention includes a transformer measurement terminal device having the above configuration and a master station for receiving data transmitted from the PHS.

【0007】

Measurement of voltage, load current, ground line current, etc. from the secondary side of the pole transformer and the low-voltage line to the consumer equipment as data on the load from the secondary side of the pole transformer and the low-voltage line to the consumer equipment. It shall include the setting of value and measurement type and abnormality information.

【0008】

In addition, it shall be equipped with a memory and a calendar capable of storing at least a certain period of data on the load from the secondary side of the pole transformer and the low voltage line to the consumer equipment.

【0009】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described based on an example in which the present invention is applied to a three-phase four-wire distribution line.

【0010】

FIG. 1 is a configuration diagram showing an outline of the low-voltage line load monitoring system of the present invention.

【0011】

In Fig. 1, 1 is a utility pole, 2 is a pole transformer, 3 is a slave station that is a transformer measurement terminal, 4 is a public base station, 5 is a public network, 6 is a PIAFS compatible TA (terminal adapter), and 7 is. It is a master station for transformer correlation measurement.

【0012】

The data signal transmitted from the slave station 3 is received by the public base station 4 of PHS, and is received by the master station 7 via the public network 5 and TA6. In addition, the master station 7 can also send a poll for a data transmission request to the slave station 3 via the public network 5 and make settings for the slave station 3.

【0013】

FIG. 2 is a block diagram showing the configuration of the slave station 3, in which the U, V, and W phase currents of the three-phase four-wire distribution line are detected by the search coil 11 and the secondary voltage of each phase is detected. .. In addition, a CT (voltage transformer) 12 for detecting the ground line current is provided to detect the ground line current. These measurement data are transmitted to the master station 7 by PHS13. Further, the transformer measurement terminal is provided with a memory 14 and a calendar 15 for storing data for a certain period of time, for example, 33 days, and transmits the data in the memo 14 at the request of the master station 7.

【0014】

In the master station 7, the received data is collected and analyzed, and the load current of the single-phase load is calculated to analyze the correlation equation between the power consumption of the consumer and the load current.

【0015】

Table 1 shows an example of basic measurement specifications for a transformer measurement terminal.

[table 1]

<img file="JP2000349918A_D0001.tif" />【0016】

Table 2 shows the abnormality information measurement and measurement period of the low-voltage load monitoring system.

[Table 2]

<img file="JP2000349918A_D0002.tif" />【0017】

FIG. 3 is a configuration diagram showing another example of the low voltage line load monitoring system of the present invention.

【0018】

In Fig. 3, 1 is a utility pole, 2 is a pole transformer, 3 is a slave station that is a transformer measurement terminal, 4 is a public base station, 5 is a public network, 6 is a PIAFS compatible TA (terminal adapter), and 7 is. The master station for transformer correlation measurement, 16 is the service line for low-voltage consumers, and 17 is the consumer equipment.

【0019】

The data signal transmitted from the slave station 3 is received by the public base station 4 of PHS, and is received by the master station 7 via the public network 5 and TA6. In addition, the master station 7 can also send a poll for a data transmission request to the slave station 3 via the public network 5 and make settings for the slave station 3.

【0020】

[Effect of the invention]

According to the present invention, the following effects are obtained. (1) Since PHS is used for data transmission, it is not necessary to lay a communication line for data transmission, and the cost can be reduced. In addition, maintenance of the communication line becomes unnecessary.

【0021】

(2) In the conventional correlation measurement, a dedicated measuring device is used, and the measuring device is attached to the low-voltage line or the lead-in line each time, and after the measurement, the measuring device is removed and taken back for data analysis. However, the present invention enables real-time measurement. This makes it possible to save time and effort for going to the site and labor for analysis work. In addition, by always installing it on site, it is possible to immediately respond to sudden abnormalities.

【0022】

(3) By storing at least a certain period of data in memory, past data can be collected when needed.

【0023】

(4) The slave station can be set from the master station by PHS without going to the installation site.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram which shows the outline of the low voltage line load monitoring system of this invention.

[Figure 2]

It is a block diagram which shows the structure of a slave station.

[Fig. 3]

It is a block diagram which shows another example of the low voltage line load monitoring system of this invention.

[Explanation of symbols]

1 Utility pole, 2 pole transformer, 3 slave station (transformer measurement terminal), 4 public base station, 5 public network, 6 TA (terminal adapter), 7 master station for transformer correlation measurement, 11 search coil, 12 CT (voltage transformer), 13 PHS, 14 memory, 15 calendar, 16 low voltage consumer service line, 17 consumer equipment