Abstract：Contact failure caused by arc ablation of contact materials is the main cause of the electrical-lifespan deterioration for miniature circuit breakers (MCBs). The study of electrical-lifespan evaluation method of MCBs is of great significance for improving safety and reliability of electricity networks. Taking some MCBs with a rated current of 16A as the object of the electrical-lifespan test, this paper observed the process of arc motion happened between moving contact and fixed contact via a high-speed camera, and extracted the characteristic quantities reflecting the degradation process of the MCB electrical lifespan from the waveform of arc voltage. Besides, this paper investigated the corresponding relationship of the contact ablation with the accumulative arcing energy and voltage reducing time respectively, and built an electrical-lifespan evaluation model of MCBs with these two characteristic quantities. The results show that the voltage reducing time has a tendency to increase with the increase of the number of breaking. The model accuracy test by experimental data shows that the evaluation method is suitable for the situation of different currents, and the evaluation error is acceptable, which can be used to assess the electrical lifespan of MCBs.
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2022, Vol. 37 
