DC circuit breaker and its self-locking device

Abstract

The invention provides a DC circuit breaker and its self-locking device, which can lock the circuit breaker after the circuit breaker is opened, and can only perform the closing operation after the self-locking device is unlocked, so as to solve the problem of the circuit breaker in the prior art. potential safety hazards. The self-locking device of the DC circuit breaker includes first and second locking parts. The first locking part is used for transmission connection with the shift fork that transmits the closing operation force in the DC circuit breaker, so as to be connected with the shift fork along the direction of the tripping action of the shift fork. Synchronous action, with a self-locking position corresponding to the tripping state of the shift fork and an unlocking position corresponding to the recovery state of the shifting fork; the guiding movement direction of the first and second locking parts is vertical; one of the two locking parts is provided with a lock pin, and the other one is provided with a lock pin card entrance; the mouth edge of the lock pin card entrance forms a lock pin stop edge, and the lock pin stop edge is used to move the first locking member and the second locking member along the shift fork When the direction of the tripping action moves relative to the lock pin, it is supported by sliding.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a DC circuit breaker and a self-locking device thereof. Background technique [0002] Most of my country's subway traction power supply systems use DC power supply. The subway traction substation converts AC power into DC power through a rectifier, and then transmits it to the DC traction catenary through a DC circuit breaker through a DC cable. DC circuit breakers are installed in subway trains or traction power supply systems to control the introduction and breaking of DC power supplies, and also play a role in protecting the power supply system. [0003] The DC circuit breakers in the prior art have different structures. For example, the DC circuit breaker disclosed in the patent document whose authorized announcement number is CN102592897B and whose authorized announcement date is 2013.07. The static contact relies on the swing of the moving contact to contact and d...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-locking device of a DC circuit breaker, which can lock the circuit breaker after the circuit breaker is opened, and can only perform closing operation after the self-locking device is unlocked, so as to solve the problem of circuit breaker in the prior art. potential safety hazards existing in the circuit breaker; another purpose of the present invention is to provide a DC circuit breaker, which can lock the circuit breaker after the circuit breaker is opened, and can only perform closing operation after the self-locking device is unlocked, with high safety

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