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1事故经过 1997年3月23日8时50分,某城市用电所因线路检修,去35kV变电所办理停电线路检修工作票。值班员根据停电要求填好操作票,即拉开01~#、02~#、03~#、04~#开关,将手车拉出置检修位置,随后分别合这四路的接地刀闸。因03~#接地刀闸合不上,螺丝打滑,就拉开10kV进线101~#总开关,将101~#总开关手车拉出放检修位置,即合101~#接地刀闸。一声巨响,主变高压侧3023~#开关跳闸,经查看系带电合接地刀闸造成。接地刀闸与手车开关是闭锁的,手车开关不拉出接地刀闸合不上,为什么10kV总开关在带电时能合上接地刀闸呢?
1 Accident After at 8:50 on March 23, 1997, a city electricity due to line maintenance, to 35kV substation for blackout line maintenance work ticket. The attendant clerks fill out the operation ticket according to the blackout requirements, that is, open 01 ~ #, 02 ~ #, 03 ~ #, 04 ~ # switch, pull out the handcart for overhaul and then respectively connect these four grounding knuckles. Due to 03 ~ # earthing knife switch is not on, screw skidding, opened the 10kV into the line 101 ~ # switch, the 101 ~ # switch handcart pulled out overhaul position, that is, 101 ~ # ground knife. A loud noise, the main transformer high side 3023 ~ # switch tripping, grounding by the joint cable knife. Grounding switch and the handcart switch is closed, handcart switch does not pull out the grounding switch is closed, why the 10kV main switch can be charged when grounding switch?