Device for preventing operation of grounding switch of switch cabinet

Abstract

The invention discloses a device for preventing operation of a grounding switch of a switch cabinet. The device comprises a cabinet body, a panel and a grounding knife shaft arranged in the cabinet body, wherein a circuit breaker operating hole and a sealing device thereof are arranged on the panel, a movable plate provided with a through hole is arranged on the sealing device, and the movable plate is linked with the grounding knife shaft through a transmission guy cable. When the grounding switch is switched on, the grounding knife shaft rotates and drives a pull head to move together, at that time, the transmission guy cable pulls the movable plate towards one side to block the circuit breaker operating hole on the panel so as to prevent a handcart operating handle from being inserted into the operating hole to effectively prevent an operator from operating the circuit breaker by mistake at the switching off state of the grounding switch to avoid electrical accidents. When the grounding switch is switched off, the grounding knife shaft rotates, the movable plate resets to a position where the through hole is opposite to the circuit breaker operating hole under the action of an offsetting spring without affecting other operations, so that the application is convenient.

Description

technical field [0001] The invention belongs to the technical field of high-voltage switchgear preventing misoperation devices, in particular to a device for preventing a circuit breaker from being operated when the grounding switch of the switchgear is in the closing state. Background technique [0002] High-voltage switchgear is widely used in power plants, industrial and mining enterprises, power distribution, and power receiving and transmission in secondary substations of electrical systems. According to the five-proof requirements of the high-voltage switch, when the grounding switch is in the closed state, the handcart of the circuit breaker must not enter the working position. In order to meet this requirement, the existing switch cabinets are equipped with guide rail interlocking devices. On the guide rail of the circuit breaker handcart, there is a tongue-shaped stop pin linked with the grounding knife. When the grounding knife is in the closing position, the stop ...

AI Technical Summary

Problems solved by technology

The existing interlocking device has the defect that it is prone to misoperation, because the travel of the circuit breaker handcart is a screw propulsion method. When in use, the operating rod is inserted through the operating hole on the panel and then shakes the screw to propel; due to the guide rail interlocking device The stop pin is located at the rear of the guide rail, and the handcart of the circuit breaker is relatively heavy, and the inertia is large when traveling; although the stop pin is in the extended state when the grounding knife is closed, the switch cabinet has been used for many years. The handcart will easily push the stop pin and enter the working position by mistake

At the same time, the operating hole on the panel of the existing switchgear is open, and the operator is easy to shake the handcart of the circuit breaker due to misoperation, resulting in a serious power supply accident when the outlet end of the switchgear is charged and the circuit breaker is operated.

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