研究了大容量断路器喷口材料的耐烧蚀性能，设计了一套基于恒流源的直流电弧发生装置，该装置可产生电压在0~400 V、电流在0~50 A内稳定燃烧的直流电弧。结果表明：稳定燃烧的直流电弧呈现负电阻特性；当燃弧时间不变时，喷口材料的烧蚀量随着电弧能量的增加而增大。
The ablation resistance of large capacity circuit breaker nozzle material was studied. A set of DC arc generator based on constant current source was designed, which could produce a stable combus-tion of DC electric arc with the voltage ranging from 0 V to 400 V and the current ranging from 0 A to 50 A. The results show that the stable combustion DC arc presents negative resistance characteristic. When the arcing time is constant, the ablation quality of the nozzle material increases with the increase of arc energy.
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