Closing and locking self-checking state indicating device

Abstract

The invention belongs to the technical field of electric power infrastructures, and particularly relates to a closing and locking self-checking state indicating device. The device is arranged on a standard handcart type switch cabinet, and is characterized by comprising a state indication panel and a plurality of connecting loops electrically connected with an original closing and locking self-checking loop of the standard handcart type switch cabinet, and specifically, in a breaker closing and locking loop, the device is led out from two ends of a breaker closing normally-open auxiliary contact; and is connected with a manual button positioned on the panel of the comprehensive state indicating device in parallel; and a pair of normally open contacts which act together with a closing loopcontact to be closed when a closing locking electromagnet acts on the travel switch of the closing locking electromagnet of the circuit breaker is added. According to the closing and locking self-checking state indicating device and method provided by the invention, the integrity of the closing and locking loop can be effectively checked in the operating state of the circuit breaker, so that the effective implementation of a reclosing function is ensured to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of electric power infrastructure, and in particular relates to a closing and locking self-checking state indicating device. Background technique [0002] The control circuit of the high-voltage circuit breaker realizes the closing and opening operations of the circuit breaker, and the effective monitoring of its closing and opening circuits has always been an important means to ensure that the circuit breaker can effectively realize the closing and opening operations. Closing and locking design is generally adopted in the operation circuit of 35 kV and below handcart circuit breakers to ensure that the circuit breaker is allowed to close only in the test or working position, but if the circuit breaker is in the running state for a long time (the handcart is in the working position , the circuit breaker is closed), the closing circuit cannot be monitored, and it is impossible to know whether the closing locki...

AI Technical Summary

Problems solved by technology

Closing and locking design is generally adopted in the operation circuit of 35 kV and below handcart circuit breakers to ensure that the circuit breaker is allowed to close only in the test or working position, but if the circuit breaker is in the running state for a long time (the handcart is in the working position , the circuit breaker is closed), the closing circuit cannot be monitored, and it is impossible to know whether the closing locking electromagnet can operate reliably. Faults cannot achieve reclosing, reducing power supply reliability

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