《35+kV并联电容器组群爆故障分析及其零序差流保护的参数整定.》.pdf

第38卷第11期 电力系统保护与控制 V01．38No．11 11 11堡!旦!旦 呈2兰!!堇兰!堡竺￡121竺垒2旦皇璺垒竺竺翌!翌! !竺：!：!!!Q 35kV并联电容器组群爆故障分析 及其零序差流保护的参数整定 陈庆祺，刘锦兰 (东莞供电局，广东东莞523000) 摘要：针对接连发生的35kV双星接线并联电容器群爆事故，计算分析了由于电容器组内部元件击穿引起的电容器过电压分 布情况。零序差流保护是通过检测双星接线电容器组的中性线不平衡电流来判断电容器组内部是否发生故障，最后提供了带 内熔丝的双星零序差流保护的正确整定计算方法，对现在执行的整定值进行了修正。 关键词：并联电容器；群爆；过电压；零序差流保护 on failureof35 Analysiscolonyfusing kV and setonitszero parallelcapacitorsparameters sequence differencecurrent protection CHEN Jin-lan Qing-qi，LIU Power 523000，China) (DongguanSupplyBureau，Dongguan Abstract：Inordertomakeit for kV clear accidentsof35double-star occurred explosion parallelcapacitors frequently，this paper calculatesand thedistributionof casued breakdownofelementswithinthe bank．Shunt analyzes overvoltageby capacitor capacitor zero differencecurrent carl in whetherthebreakdownofinternal elementsexistsbanks sequence protectionjudge capacitor by neutrallineunbalancedcurrent．At the methodofdouble—starzero differencecurrent detecting last,itgivessetting sequence andmodifiesthe value． protection workingsetting differencecurrent Keywords：parallelcapacitors；colonyfusingfailure；o