Arrangement for displaying the switching position and for displaying contact erosion in an electrical switching device

0001The invention relates to an arrangement to shift position and erosion indication at least one stationary and at least one mobile Contact of an electrical switching device.

0002By burning the loss of contact material, the under load when switching produced by the arc at the contacts, respectively. For the Life and functionality of switching devices, it is therefore particularly even when equipped with vacuum interrupters protecting importance, not only the position of the contacts on or off at the Schütz read, but also current knowledge of the progress of the to obtain erosion of the contacts to view the contacts or vacuum interrupter be able to replace. It is already known, the burnup to measure by means of a sensor in the switched-on state of a contactor and display. This display is independent of a switch position indicator same contactor. In these known embodiments of the Abbranderfassung it is disadvantageous that within by placing the sensor the housing, the control is difficult and only with the lid open of is allowing to be controlled contactor. In addition, the switch position indicator separately from an erosion indication.

0003From EP 0292849 A2 discloses an electric switching device with one fixed and a movable contact and an arrangement for switch position indicator known. The movable display element of the switching movement participates movable contact and from which the respective position of the movable Display element can be read to a window edge, giving the information the switch position on or off again. DE 31 19 256 A1 are electrical switching devices with visual displays of the respective switching position known through openings with transparent material or magnifying glasses.

0004The invention has for its object to provide a simple visible from the outside Indicator for the erosion of the contacts in the vacuum interrupters to create that is also coupled to a switch position indication.

0005This object is in a generic arrangement solved in that two mutually associated display elements provided are, one of which fixed a display element relative to the fixed Contact is connected and the other display element fixed with respect to is connected to the movable contact, such that the second display element the shifting movement of the movable contact and participates in the respective position of the display elements to each other the switching position (On - Off) can be read and in the switching position A at the same time the burn is of the contacts can be read.

0006Had advantage of the invention are the characterizing features the subclaims.

0007A particularly advantageous application of the invention in a vacuum switching devices with accommodated in a vacuum interrupter stationary and movable contacts. To this end, the invention proposes, that for each vacuum interrupter two associated indicators are provided, of which the fixed display element fixed with the arranged in the vacuum contactor vacuum switching tube with in the vacuum interrupter fixed-point fixed contact is connected, and the other display element fixedly movable with the in the vacuum interrupter driven contact-bearing member is connected, such that the second display element participates the shifting movement of the movable contact and from the respective position of the display elements to each other the Switch position (on - off) can be read and in the switching position A simultaneously the erosion of the contacts can be read. According to the invention with two display elements worked, one of which is fixed to the stationary contact the vacuum tube is assigned and, and the other Anzeigeel ment is coordinated with the movable contact of the vacuum interrupter, so that it participates the shifting motion of the movable contact. Thus, According to the invention enables the position of the two display elements each at any time on the switching position of the switching device are, namely, A position and the off position. Furthermore, in position A, the arrangement of the two display elements to each other a measure of the combustion of the contacts, for example, in the vacuum interrupter.

0008The display according to the invention the switching position and the erosion is self-explanatory regarding on and off. The invention enables a display for switch position and contact erosion. The inventive arrangement is simple in design and reduces the necessary components for the representation and display the switch position and the burn. Furthermore allows the inventive arrangement by display elements a immediate real ad without transmission elements, so that the Possible error is reduced accordingly. Furthermore, the present invention Arrangement for displaying the burn and the shift position the advantage that also with three phases of a vacuum switching device, that is, three Vacuum tubes, also an asymmetrical contact erosion of the various Vacuum tubes mitangezeigt immediately and is automatically recognized. Since the Display elements are working according to the invention without transmission elements, is it is also possible directly by direct access to the display elements make a direct measurement, which Abbrandmaße can be determined.

0009The display elements of each of the pairs of contacts of a vacuum interrupter are directly visible via an assigned in the lid of the vacuum contactor opening. Here, the opening means of a transparent material, or a magnifying glass and glass covered.

0010In a further embodiment of the display elements is provided in that the solid looking indicator on its on the movable display element Head side has lateral recesses, the depth of the allowable burnup equivalent of the mobile and fixed contact. is In this way, elected a symbolic representation of contact for the display elements with the actual height of contact, ie the possible Abbrandmaß matches. For tolerance reasons, however, it is recommended in the design the display elements with respect to their association with each other a safety reserve provide, for example, such that the display elements are formed such that they overlap one another in each switching state and through corresponding recesses the want ads are visualized.

0011An essential advantage of the inventive arrangement for displaying the Switching state and the Abbrandzustandes is that displaying an authenticity indicator is and the duty ratios corresponds directly. The display elements are very robust.

0012An advantageous had training of the display elements provides that they in essentially formed of an angularly bent wall piece, each a bent strip end of the fastening of the display element serves and the other band end of the display, and the display elements so on mounted and arranged the vacuum interrupter and the movable part are that the display of the serving band ends against each other on one another directed parallel spaced plane.

0013In the arrangement of the display elements within the vacuum switching device and assigned to the vacuum interrupter is preferably the fixed display element near the exit end of the movable contact-bearing The contact carrier from the vacuum interrupter is mounted on the vacuum switch tube is and the movable display element on a movable acting contact bearing contact carrier with a switching movement Lifting rod is attached.

0014The default setting and adjustment of the display elements can factory, ie during assembly of the switching device when the switching contacts, be performed.

0015With the help of the inventive arrangement, the burn-up, ie the state the switching contacts, during the service outlet constantly by visual inspection be detected without the vacuum switching device to be opened have to be. Similarly, an asymmetric contact erosion of the three vacuum interrupters a switching device shown directly visible.

0016The invention is described with reference to the drawing, the example of a Vacuum contactor explained in more detail. Show it<dl tsize="16" compact="compact"><dt>Figure 1:</dt><dd>a partial cross-section through a vacuum contactor with vacuum switch tube and display means for switching state and burn:</dd><dt>Figure 2a, b</dt><dd>Schematically, the display device for switching state and Burn a vacuum interrupter in the open and closed Switching state;</dd><dt>Figure 3:</dt><dd>a schematic plan view of a Vacuum contactor with display devices;</dd><dt>Figure 4:</dt><dd>a schematic representation of the combined switching status and erosion display in different switching positions;</dd><dt>Figure 5:</dt><dd>a window in detail with a switch position indication and erosion indication a vacuum contactor according to FIG. 1;</dd><dt>Figure 6a-f:</dt><dd>different display situations;</dd><dt>Figure 7:</dt><dd>Detail of the vacuum interrupter shown in FIG. 1 in a schematic Display with display elements;</dd><dt>Figure 8:</dt><dd>perspective view of the housing cover of the vacuum contactor of FIG. 1.</dd></dl>

0017In FIGS. 2a, 2b, the inventive combined switching position and Erosion indication shown in its basic structure and operation. In Fig. 2a is the switching position from at open contacts 401, 411 a Vacuum interrupter shown. The fixed contact 401 is connected to a contact carrier 40 fixedly disposed in the vacuum contactor. The movable contact 411 is mounted on a contact carrier 41 which together by means of a lifting rod 5 with the contact 411 at start up, see Fig. 2b, in direction of the arrow P until Contact with the fixed contact 401 is moved. Each switching contact 401, 411 has a rated value of the erosion contact material amount, wherein the respective permissible erosion (depth) is denoted by a1 and a2. Of the Spacing of the contact surfaces of the fixed contact 401 and the movable Contact 411 from each other in the open state is denoted by a0. Of the Burn a1 and a2 is, for example 0,75 mm, the contact opening a0 has 2 mm. The fixed contact 401 and movable contact 411 are in the stationary mounted in the contactor vacuum interrupter as housing accommodated. Near the exit end of the movable contact 411 bearing Part of the vacuum interrupter 2 is fixed to the vacuum interrupter 2, the first display element 7 is attached. On the movable member, which is connected to the movable contact 411 and its movement causes here the displacement rod 5, which the contact 411 in the direction of arrow P on fixed contact 401 is moving, the second display element 8 is firmly applied. When moving in the direction of arrow P 8 makes the display element Shift movement directly in the direction of arrow P, see Fig. 2b. The display element 7 in this case remains in its stationary position. By changing the distance between the mutually facing ends 7a, 8a of the display elements 7, 8, the shift position is first displayed, see Fig. 2a, the shift position From and Fig. 2b shows the switching position A. Moreover, with advancing Burn the end of the display element 8a continues to the display element 7 or wander this overlap, so that hereby directly proportional to the progressive erosion and the burnup be read.

0018In the Fig. 3 schematically shows a vacuum contactor 1 in the plan view of the lid 3 shown, the corresponding three windows 31, 32, 33 three vacuum interrupters is equipped with switch contacts. The display elements 7 and 8 are visible in the windows 31, 32, 33rd

0019In the Fig. 4 schematically the various positions of the display elements 7, 8 to each other according to the positions of the fixed contact and of the movable contact shown. As an authenticity indication exists, is the distance between the display elements 7.8 in the off position A in accordance with the Contact position a0. On the fixed display element 7 are at the movable Display element 8 facing end side lateral recesses 401a, 401b, see FIG. 5, is formed, wherein the depth of these recesses the maximum combustion a1 + a2 of the switch contacts, see Fig. 2a corresponds to. In yet new contacts will be in the one switching position E1 the lateral recess the still possible burn a1 + a2 show throughout its depth, ie make them visible. After a certain operating time of the vacuum contactor is in the ON state E2 already by the Verkleinetung Depth of the recess, ie by reducing the visible gap of progressive erosion visible. When a full burn is a1 + a2 is, as is in the on state by the disappearance of the display E3 of the gap, ie the recesses, this can also be seen. The display elements 7 and 8 show thus directly events on the Switch contacts at 401, 411, ie, the vacuum interrupters need to unspent be replaced.

0020In FIG. 5, the configuration of the window 31 of a vacuum contactor according to Fig. 3 is shown here with oval enclosure, wherein said window with a transparent material is covered. Below the window are the Ends of the display members 7, 8, the movable contact 401 and the fixed Contact 411 meet and make their switching paths visible arranged.

0021Thus, as shown in Fig. 4, a life display with the invention Arrangement of display elements possible in the form of a combined switch position and erosion indication. The erosion indication is at the switching position A visible.

0022In the FIG. 6a for a vacuum contactor according to FIG. 3 with three vacuum interrupters and three display windows 31, 32, 33 of the switching state shown Off said nothing about the Abbrandsituation be seen. In FIG. 6B, the A shift position shown and according to the specification and the size of the still visible distance a between the two display elements can be seen by the recesses that no combustion is present and the A shift position is present. In Fig. 6c in turn is the switch position A recognizable and by reducing the distance a of the two display elements 7, 8, an average erosion of the contacts displayed. Another factor to be seen that all three vacuum interrupters have the same burnup, So are evenly loaded. In Fig. 6D, the shift position is a recognizable and further in that a further substantially increased burn-up of the there has been contacts by appropriate approximation of the display elements 7, 8 to each other. In FIG. 6E, the switching position is visible A and simultaneously complete convergence of display elements 7.8 each the complete erosion of the contacts displayed. While in the previous representations respectively symmetrical burning of Contacts has been shown is shown in Fig. 6F, as well as an asymmetric Contact burning switching state A immediately recognizable and visible is made. Here, a complete burn-up is displayed in the left window 31, while the other two windows 32, 33 and also a considerable Show different erosion of the contacts.

0023In the FIG. 1 is a partial cross-section through a vacuum contactor by a vacuum switch tube 2 with the inventive features of display elements represented 7.8. The vacuum interrupter 2 is on the contact carrier 40 of the fixed contact 401 to the terminal lug 15 by means of screw 16 mounted in the housing of the vacuum contactor. The movable contact 411 is fixed to the movable contact carrier 41, which at its rear protrudes from the end of the vacuum interrupter 2 and by means of the displacement rod 5 from the OFF switching position into the switch-on position in the direction P, and vice versa is movable. With the displacement rod 5 is the strand 13 that the connecting bar 14 leads connected. The lifting rod for moving the movable Contact 411 is connected to one end of the contact carrier 41 and at the other end with two nuts 55, 56, with whom they in the bush 57 is mounted. Furthermore, the lifting rod or the contact carrier 41 is 5, the lifting rod is acted upon by the contact pressure spring. 6 The anchor 10 mounted on the anchor receptacle 11 on the rocker 12th In a switch- the lifting rod with their nuts 55, 56 including thereon fixed wire 13 and the nuts 54, the braid on the lifting rod fix, and the contact carrier 41 and the contact 411 moves. The fixed Display element 7 is now fixed to the stationary vacuum interrupter second Preferably, the display element 7 is near the exit end of the movable Contact carrier 41 fixed in the vacuum interrupter. 2 The display element 7 is formed at an angle so that the display leg extending parallel to the axis of motion the switching contact 411 extends. The movable display element 8 is connected to the displacement rod 5, here in the region of the strand 5. Also the movable display element 8 is formed at an angle so that the display angle in turn parallel to the axis of movement of the movable contact 411, whereby said shifting movement directly in real size Gets transferred. are the two display legs of the display elements 7, 8 Also parallel to the extension of the lid 3 of the vacuum contactor upper side covers and the associated with the display elements 7, 8 window or openings 32 are formed, the transparent with a Material 32a are covered. In this way, the display elements are 7.8 visible from the outside, so that the display of the switching state and the Abbrandzustandes, as explained above, is visible at all times.

0024In FIG. 7, the arrangement and mounting of the display elements is at 7.8 a vacuum contactor according to FIG. 1 partially illustrated as enlarged detail. The vacuum interrupter with their different body parts fixedly accommodated in the vacuum contactor. At one end it is with the stationary contact carrier 40 of the stationary contact connected. At the the other end of the vacuum interrupter 2, the shifting movement in the direction of arrow P by means of the displacement rod 5 to the movable contact carrier 41 with the transfer movable contact 411th With the lift-rod down the strand 13 connected by means of nuts 54th Between the nuts 54 and the braid 13 is also attached to the lifting rod 5, the display element. 8 In motion the displacement rod 5 in the direction of arrow P, the display element 8 according moved while the display element 7 fixed on the vacuum interrupter 2 is fixed and is thus arranged to be stationary in the vacuum contactor. 3 The contact pressure spring 6 is then in a spring plate 9 to the fastening the strand 13 is arranged by means of the nut 54 on the handle. 5 The Locknut 54 serves together with the said internally threaded Spring plate 9 for adjusting the contact pressure spring 6 and thus the contact force. The shift indicator and erosion indication by the display elements carried 7.8 or its parallel led display regions 7a, 8a as explained above in Figs. 2-6.

0025In FIG. 8 is a perspective view of the lid 3 of the vacuum contactor shown in FIG. 1. The oval window 31, 32, 33 serve for the display of the switch position of the erosion by the display element 7, 8th.

0026The inventive combined switching status and erosion indication is robust, very easy and the viewer always shows the state of the Contactor to in respect of its switching contacts.