In order to study the relationship between coil current and electromagnetic system performance,an electromagnetic system mathematical model of hydraulic and spring high-voltage circuit breaker operating mechanism was established by magnetic circuit.The effect of parameters,such as coil voltage,coil loop resistance and the core air travel,on coil current was analyzed in theory and simulation.Tests were carried out on high-voltage circuit breakers of 126 kV spring mechanism and 550 kV hydraulic mechanism with changing electromagnetic system parameters.The simulation and experimental results showed that electromagnetic system parameters,such as closing coil voltage,coil loop resistance and core air travel,have a significant impact on the performance of the operating mechanism,and would affect the operation of high voltage circuit breakers performance and reliability.The research results could have important implications for the status assessment of high voltage circuit breaker operating mechanism.
