Circuit breaker tripping and closing loop all-condition monitoring circuit

Abstract

A circuit breaker tripping and closing loop all-condition monitoring circuit comprises a closing monitoring loop, a closing loop, a tripping monitoring loop, a tripping loop, a first circuit breaker body and a second circuit breaker body. The first circuit breaker body comprises a closing coil YC, a normally open contact S1, a normally closed contact S2 and a normally closed contact S3. The normally open contact S1 is connected in series with a coil part of a closing loop monitoring relay HJS. An end A of the normally-closed contact S3 is connected with an end A of the coil part of the closingloop monitoring relay HJS and a coil part of a closing self-holding relay SHJ respectively. The invention aims to provide a circuit breaker tripping and closing loop all-condition monitoring circuitwhich can well perform all-condition monitoring on tripping and closing loops of a circuit breaker, comprising comprehensive monitoring of the tripping and closing loops, tripping and closing coils and an interlocking loop.

Description

technical field [0001] The invention relates to the field of relay protection, in particular to a circuit breaker tripping and closing circuit full working condition monitoring circuit. Background technique [0002] Traditional circuit breaker tripping and closing circuit monitoring, such as figure 1 As shown, it is realized by using HWJ and TWJ monitoring relays. Its principle is that the HWJ monitoring relays are connected in parallel at both ends of the trip outlet contacts, and then connected in series to the trip coil circuit. When the circuit breaker is closed, the monitoring of the trip circuit is realized. The TWJ monitoring relay is connected in parallel at both ends of the closing outlet contact, and then connected in series to the closing coil circuit, and realizes the monitoring of the closing circuit when the circuit breaker is in position. [0003] Obviously, the HWJ monitoring relay can only play a monitoring role when the circuit breaker is closed, and the T...

AI Technical Summary

Problems solved by technology

[0006] 1) It can only monitor whether the tripping and closing coil is disconnected, but it does not have the monitoring function for whether there is an inter-turn short circuit in the tripping and closing coil;

[0007] 2) It cannot monitor the interlock circuit other than the trip coil

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