摘要
某500 kV变电站35 kV 1号干式空心并联电抗器发生U相跳闸事故,通过现场试验及解体检查后,确认事故是由于制造工艺缺陷引起电抗器局部过热、绝缘材料失效,导致匝间短路;绝缘材料失效面积扩大,短路现象加重,最终造成电抗器放电烧损。针对本次电抗器事故,提出减少并联电抗器投运次数、加强电抗器绝缘测试工作、增加红外检测频率、严格审查采购方案等整改建议。
To the U-phase tripping accidents on a 35 kV No.1 dry type hollow shunt reactor in 500 kV substation,from the aspect of equipment operating conditions,field test,the collapse of the analysis,got the following conclusions：According to the aging mechanism of the insulation material,the reason of insulation failure was presumed to high temperature,by coating a melting pit speculated that high temperature reached 660 degrees,using wire layout disequilibrium and bulge,determined manufacturing defects,etc.Finally determined the direct cause of the failure for manufacturing defects lead to wire partial discharge superheat,and pointed out the problems of the design life and the means of safety maintenance of equipment failure,and put forward suggestions for improvement in combination with the actual power grid.
出处
《内蒙古电力技术》
2016年第2期77-81,共5页
Inner Mongolia Electric Power
关键词
干式空心并联电抗器
绝缘材料
匝间短路
线圈
制造工艺
dry type hollow shunt reactor
insulation material
turn-to-turn short circuit
coil
manufacturing process
