Abstract:

In order to obtain the mechanical characteristic information of the vacuum circuit breaker,it is necessary to perform the parameter measurement and state analysis,and to calculate the closing speed of the circuit breaker.It is necessary to obtain the moment-close point of the moving and static contacts.First,several methods for testing the mechanical characteristics of circuit breakers are introduced,and the existing methods for extracting the moment-close point are compared.The advantages and disadvantages of each method are clarified.Combined with the filter derivation method,the moment-close point of a certain type circuit breaker is extracted and compared with the real moment-close point.For online monitoring applications,the above methods can extract the moment-close point of the circuit breakers.There must be some trades-off in practice.

Key words: circuit breaker, moment-close point, closing coil current, contact pressure, displacement curve