Tripping system of circuit breaker

Abstract

The invention discloses a tripping system of a circuit breaker. The tripping system comprises a static contact, a moving contact, a moving contact rod, a spring mechanism, a hook, a tripping shaft, a rotating rod, a pulse tripping device and an overcurrent tripping device, wherein the static contact is fixed on the rack of a circuit breaker, a static contact sheet is welded at the front end of the static contact, the moving contact is welded and fixed at one end of the moving contact rod, the tripping shaft is fixed at the other end of the moving contact rod, the moving contact rod is rotationally connected with the rack of the circuit breaker through a rotating shaft, one end of the spring mechanism is hinged with the rack of the circuit breaker, the other end of the spring mechanism is rotationally connected with the moving contact rod through the rotating shaft, one end of the hook is in hasp connection with the tripping shaft, the end, connected with the tripping shaft, of the hook extends outwards, the other end of the hook is rotationally connected with one end of the rotating rod, the other end of the rotating rod is hinged with the rack of the circuit breaker, and the pulse tripping device and the overcurrent tripping device are used for jacking the hook, so that the static contact and the moving contact are further separated, and tripping and opening of the circuit breaker are realized.

Description

technical field [0001] The invention relates to the field of switching appliances, in particular to a tripping system of a circuit breaker. Background technique [0002] A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. In the rail transit traction power supply system, the circuit breaker is the guarantee for the safe operation of the power supply system. Under abnormal circuit conditions, the breaking time of the circuit breaker will directly affect the time for the traction power supply equipment to carry the fault current. In order to protect the safety of the power supply equipment under abnormal conditions, the circuit breaker needs to start a quick opening response in a short time. Generally, in order to shorten the inherent opening time of the circuit breaker, the depth of the mechanical buckle of the circuit ...

AI Technical Summary

Problems solved by technology

Generally, in order to shorten the inherent opening time of the circuit breaker, the depth of the mechanical buckle of the circuit breaker is only 1 to 2mm. Due to the small depth of the mechanical buckle, it is very difficult to operate in an operating environment with vibration and shock (such as locomotives, ships, etc.). It is easy to cause false tripping of the circuit breaker, which reduces the closing reliability of the circuit breaker

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