真空断路器分闸电磁铁动态仿真及故障分析OA

The fault of the opening and closing electromagnetic mechanism is the main reason for the abnormal switching,refusal operation and mal-operation of vacuum circuit breaker.Accurate analysis of the operating state of the opening electromagnet of the vacuum circuit breaker is of great significance for stable operation of power system.In this paper,the opening electromagnet of the vacuum circuit breaker is taken the study object and a dynamic simu-lation model of the opening electromagnet of the vacuum circuit breaker is set up.First,the operating principle of the opening electromagnet is derived and the operating state of the plunger in normal condition is analyzed.Then,the simulation current waveform characteristics under such failure states as poor contact,core jamming and inter-turn short circuit are compared to analyze systematically the influence of different faults on the opening of the circuit breaker.Finally,a simulated opening experiment is performed on the circuit breaker's opening electromagnet,with three types of faults-poor contact,core jamming and inter-turn short circuit,being configured.The opening coil cur-rnt under fault conditions is collected and compared with the simulated waveforms.The effectiveness of the simula-tion model is verified by the experimental result,which provides an important means for fault analysis,fault monitor-ing,and condition assessment of circuit breaker electromegnatic mechanisms.