大型发电机谐振引起的定子接地保护误动原因分析

摘要

针对山西省内多起大型发电机谐振引起定子接地保护误动的故障，介绍了故障发生时的情况，从发电机中性点消弧线圈挡位选择、发电机出口电压互感器等方面入手，分析了导致发电机定子接地保护误动的原因，最后提出避免大型发电机定子接地保护误动的措施和建议。%Focusing on the faults of some large capacity generator stator ground protection mal-operation in Shanxi province,this paper briefly introduces the situations when the faults occurred. It analyses the causes leading to generator stator grounding protection mal-operation from the the aspects including gear selection of arc suppression coil at generator neutral point and voltage transformer at generator outlet.At last,the measures and suggestions for avoiding large capacity generator stator grounding protection mal-operation are put forward.