SU1686559A1 - Cabinet for compete high-voltage switchboard arrangement - Google Patents

Abstract

The invention relates to electrical engineering and can be used in high voltage switchgear. The purpose of the invention is to increase reliability by lowering the short-circuit current threshold of the arc short circuit, as well as reducing the size. The cabinet contains equipment compartments, an electric arc sensor, made in the form of a limit switch mounted on the frame with the ability to interact with a sensitive element mounted on the frame. The electric arc sensor is made with an angular lever that can communicate with one end with a spring-loaded contact element and the other with a sensitive element. The sensing element is made in the form of a plate mounted inside the frame with the possibility of two-way rotation around its axis. 2 ep f-ly. 3 il.

Description

WITH

WITH

The invention relates to electrical engineering, namely to complete switchgear (switchgear) of high voltage (6-35 kV).

The purpose of the invention is to increase reliability by lowering the short-circuit current threshold of a short circuit and downsizing

Figure 1 shows the closet switchgear, general view; figure 2 - sensor of the electric arc, side view; FIG. 3 shows section A-A in FIG. 2

The switchgear cabinet consists of a case in which there are compartments: cable (outgoing line) 1, busbar 2, relay protection

3 and switch 4. Compartment 1 cable from the compartment

4 switches are fenced off by a partition 5. On the wall of the latter, an electric arc sensor 6 is installed. It may also be located on the cabinet body, for example, sensor 7

electric arc in figure 1. A reflector 8 can be used to shift the direction of the gases towards the ground, it protects the sensor from snow, rain. Figure 1 shows the location of the calculated short circuits - point K1 - KZ.

The electric arc sensor consists of a limit switch 9, which serves as the actuator of sensor 6. It is rigidly mounted on top of frame 10, in which a sensing element (plate) 12 rotates on axis 11. The ends of the axis 13 extend beyond the frame 10 for the reliability of the sensing element 12, the Stop 11 is a holding element. Its end part 15 rests on the end of the movable part of the sensing element 12 Stop 14

About 00 About SL

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It is part of the angular lever 16. It is fixed in the support 17 and can be rotated on its axis. On the side of the final control element 9, the lever 16 has a bevel 18 which abuts against the spring-loaded contact element 19. In the initial position, it is recessed. Its contacts are, for example, in an open state. It can contain several contact pairs at once. Part of them is open, part is closed. With the aid of the lugs 20, the frame 10 is fastened to the bulkhead inside the cabinet or to the cabinet body. The screw 21 serves as a handle for moving the sensing element 12. The end 15 of the anvil 14 of the angle lever 16 may have a concave surface for engagement with the end face of the sensing element 12.

In FIG. 3, reference numeral 22 denotes a bulkhead wall (or cabinet wall). Position 23 marked the cutout in the bulkhead. It is necessary to allow the electric arc sensor 6 to operate bilaterally, if, for example, it is located on the bulkhead between the compartments (sensor 6, FIG. 1). If it stands on the wall of the housing (sensor 7, FIG. 1), then cutout 23 increases the sensitivity of the sensor by eliminating the counter-pressure (compression) from the side of the closed volume behind the sensitive element 12 towards the wall. In order to avoid gas blowing out to the outside, a portion of the uncut wall 22 was left. In the actuated position (position 24), the sensitive element 12 prevents the gases to blow out. In double-sided mode, this stop is needed to prevent the sensor element 12 from coming close to the current-carrying tires. Position 25 shows the position of the lever 16 in the actuated position. The stop 26 serves to limit the travel of the sensing element 12 when using the sensor 6 in a two-way mode. The angles A and C allow adjusting the speed of operation of the electric arc sensor 6, ease of cocking the angle lever 16 into operation, and reliability of operation.

Cabinet KRU works as follows.

When occurring, ke for example, at point K1, the shock wave presses on the sensitive element 12 with an effort P (FIG. 3, indicated by an arrow). The sensing element disengages from the stop 14. The angle lever 16 takes position 25 and the spring-loaded contact element comes out, closing the circuit to turn off the power to the switchgear cabinet. Similar work at k. at points K2 and KZ.

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Claims (3)

1. The cabinet of the high voltage switchgear containing the busbar compartments of waste line, switch, relay protection and arc sensor, made in the form of a limit switch with a spring-loaded contact element installed with the possibility of interaction with a sensor mounted rotatably around its axis on a frame mounted on the cabinet body, characterized in that, in order to increase reliability by reducing the arc short-circuit current cut-off threshold, as well as downsizing, the limit switch is mounted on the frame, the arc sensor is made with an angular lever having the ability to interact at one end with a spring-loaded contact element, the other end with the end of the movable end of the sensitive element, made in the form of a plate, while The sensing element is installed inside the frame with the possibility of two-sided rotation around its axis. 2. A cabinet according to claim 1, characterized in that the end of the angular lever, which is mounted so as to interact with the sensitive element, is made with a concave surface facing the angular lever. 3. A cabinet according to claim 1, characterized in that. In order to increase the convenience of operation, the end of the angle lever on the side of the spring-loaded movable contact element is made with a bevel at an acute angle located on the side of the frame and facing the spring-loaded movable contact element. 2 17 1819 , L L l 1 FIG. 2 13 V444 44V444 SSSS SSSSSgSS 22 / T A-A 3 Faye. J 2J