Spring transmission based circuit breaker auxiliary contact conversion apparatus and circuit breaker control loop formed by same

Abstract

The invention relates to the technical field of a circuit breaker, and specifically to a spring transmission based circuit breaker auxiliary contact conversion apparatus and a circuit breaker control loop formed by the same. The spring transmission based circuit breaker auxiliary contact conversion apparatus comprises a circuit breaker auxiliary change-over switch, a spring and a transmission connecting rod, wherein one end of the transmission connecting rod is externally connected with a circuit breaker main contact transmission shaft; the other end of the transmission connecting rod is connected with one end of the spring; one end of the spring is connected with the contact of the circuit breaker auxiliary change-over switch; according to the circuit breaker control loop, a time-delay contact 52A is connected with an auxiliary contact 52b of a circuit breaker switch-on control loop in parallel; a time-delay contact 52B is connected with an auxiliary contact 52a of a circuit breaker switch-off control loop in parallel; the time-delay contact 52A and the time-delay contact 52B are both spring transmission based circuit breaker auxiliary contact change-over apparatuses; the trigger characteristic of the time-delay contact 52A is the same as that of the auxiliary contact 52a; and the trigger characteristic of the time-delay contact 52B is the same as that of the auxiliary contact 52b.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a spring-driven circuit breaker auxiliary contact switching device and a circuit breaker control circuit formed therefrom. Background technique [0002] Current design methods for circuit breaker control loops (e.g. figure 1 shown), the basic principle is that during the closing operation of the circuit breaker, the integrity of the two sets of trip circuits of the circuit breaker can be monitored through the intermediate HWJ relay, and the integrity of the closing circuit cannot be monitored at this time; during the opening period of the circuit breaker, through the intermediate The relay TWJ monitors the integrity of its closing circuit, and cannot monitor the integrity of the tripping circuit at this time. From the point of view of actual operation, during the closing operation of the circuit breaker, the defect of recessive closing control circuit disconnection ofte...

AI Technical Summary

Problems solved by technology

In the case of the above defects, when the line fault occurs during the closing operation of the power grid, after the protection device trips the circuit breaker to remove the fault, after the reclosing device issues a closing command, due to a disconnection fault in the closing control circuit, the circuit breaker cannot Normal closing, which brings hidden dangers to the stability of power grid operation and reduces the reliability of power supply to users

Images