Abstract:

As the core component of short-circuit breaking of medium voltage DC circuit breaker,the performance of electromagnetic tripper affects the breaking ability of circuit breaker.The static electromagnetic attraction characteristics and dynamic motion characteristics of an electromagnetic tripper are simulated and calculated,and the parameters of the electromagnetic tripper are determined according to the results.Finally,the test results of the tripping time of the electromagnetic tripper are consistent with the simulation results,which achieve the design goal.This simulation method can apply to the design and optimization of the electromagnetic tripper of the medium voltage DC circuit breaker.

Key words: medium voltage DC circuit breaker, electromagnetic trippers, magnetic adhesion, finite element analysis