Circuit breaker body three-phase inconsistency protection maloperation prevention loop with monitoring function

Abstract

The invention discloses a circuit breaker body three-phase inconsistency protection maloperation prevention loop with a monitoring function. The loop comprises a first starting loop, a second startingloop, a first outlet loop, a second outlet loop, a first monitoring loop, a second monitoring loop, a first DC power supply and a second DC power supply; wherein the starting loop comprises a contactcombination and a time relay coil which are connected in series at two ends of a direct-current power supply, a pair of normally open contacts and tripping relay coils of two time relays which are connected in series at two ends of the direct-current power supply, and also includes monitoring relay normally closed contacts which are connected in parallel at two ends of the normally open contactsof the time relays; the outlet loop comprises a normally open contact group of the tripping relay, and a first end of the outlet loop is connected to the first end of the direct-current power supply after contact combination; and the monitoring loops are connected in parallel to two ends of the contact combination and comprise monitoring relay coils. Compared with the prior art, even if an outletloop is mistakenly conducted, outlet mistrip cannot be caused, and switch misoperation can be effectively prevented; the two sets of loops are independent of each other and can effectively prevent switch operation refusal.

Description

technical field [0001] The embodiment of the present invention relates to the field of circuit breaker technology, in particular to a three-phase inconsistency protection anti-misoperation circuit of a circuit breaker body with a monitoring function. Background technique [0002] In the power system, the three-phase inconsistent operation of the circuit breaker occurs frequently, which seriously affects the stability of the system. In order to avoid the damage to the system caused by the three-phase inconsistency of the circuit breaker body, the circuit breaker of 220kV and above must be equipped with the three-phase inconsistency protection of the body. [0003] The three-phase inconsistency protection circuit of the 220kV and above circuit breaker body currently in operation adopts the same circuit breaker configuration with the same two sets of body three-phase inconsistency protection circuit scheme. However, due to complex wiring and harsh operating environment, there ...

AI Technical Summary

Problems solved by technology

Connecting the contacts of the two outlet circuits directly in series will also lead to the problem of refusal of the protection circuit caused by a set of circuit failures

[0004] The existing three-phase inconsistency protection circuit of the circuit breaker body has frequent misoperation and refusal to operate, which cannot meet the needs of safe operation of the power grid

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