一起HGIS设备带电合地刀事故的分析和防范

Analysis and Prevention on a HGIS Accident of Closing Grounding Switch to Energized Live Part

带电合地刀是五大恶性误操作之一,必须坚决予以防范。介绍了发生在某500 kV变电站HGIS设备的一起带电合地刀操作及其分析处理过程,得出事故发生的原因为HGIS内部隔离开关操动机构某连板螺钉脱落,导致刀闸实际未断开,提出了厂家应采取改进措施、建立完善的五防系统、标注HGIS分合闸位置、严格执行间接验电程序4条防范措施,对于防止类似事件的发生有很好的借鉴作用。

Closing grounding switch to energized live part is one of the five serious misoperation accident,which must be resolutely against.This article introduces a closing grounding switch to energized live part accident of HGIS equipment,including its operation,analysis,treatment process in a 500 kV substation.The cause is a screw drop off from disconnector operating mechanism in HGIS chamber,resulting in the switch has not disconnect actually.This paper emphatically put forward to four preventive measures, that is,improving measures to be taken by the manufacturers,establishing a perfect five prevention misoperation system,tagging HGIS close-open position clearly,strictly executing indirect electrical inspection procedures.It provides a reference to prevent similar incidents.