摘要
某500 kV输电线路停电后在工作接地线挂设处发生了导线断裂掉线故障。通过对受损导线进行宏观检查、线路感应电流(电压)仿真、现场电流验证、接地线和导线材质检测及试验室验证等工作,认为故障原因为工作接地线铜线夹与铝导线长时间在酸雨潮湿环境中发生了原电池化学反应,且邻近线路的高幅值感应电流对电化学腐蚀进程具有加速作用,形成的间歇性电弧放电灼伤了导线,并最终导致导线断裂掉线;提出在超特高压输电线路上优先选用铝或铝合金材质线夹的接地线,以及处于强酸雨环境中工作接地线严禁选用铜质线夹等建议。
After a 500 kV transmission line was cut off,there was a broken wire fault at the grounding wire hanging point.Through the macroscopic examination of the damaged wire,the simulation of the line induction current and voltage,the field current verification,the grounding wire and the test of the wire material,it was considered that the cause of the fault was the formation of the chemical reaction of the primary battery between the copper wire clamp and the aluminum wire in the acid rain and wet environment for a long time,the arc discharge burned the conductor and eventually broke the wire,and the high amplitude induced current near the line accelerated the electrochemical corrosion process.
作者
朱迪锋
许杨勇
吴坤祥
丁栩麟
ZHU Difeng;XU Yangyong;WU Kunxiang;DING Xulin(Maintenance Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 311232,China)
出处
《内蒙古电力技术》
2018年第3期37-40,共4页
Inner Mongolia Electric Power
关键词
500KV输电线路
导线断裂
接地线
电化学腐蚀
电弧放电
500 kV transmission line
line fracture
grounding wire
electrochemical corrosion
arc discharge
