Analysis and treatment of a 400V circuit breaker failure to close

Based on the fault finding process of 401 circuit breaker at the low voltage side of 10kv#1 grounding station of 110kV Fenghuang substation, combined with the structural principle of HSW1-2000 circuit breaker, this paper expounds the fault causes and exposed problems of HSW1-2000 circuit breaker, and puts forward corresponding operation and maintenance suggestions.