摘要
绝缘子污闪时单相故障电流一部分通过杆塔入地,一部分通过地线(OPGW、钢绞避雷线)分流。当杆塔接地电阻较大时,地线有明显的分流效果,会造成地线发热,严重时甚至会导致断股断线。某线路绝缘子污闪过程地线分流的仿真结果表明有较大的短路电流流过地线;地线的短时热稳定校验结果也表明地线的安全系数下降较明显。通过对故障现象的原因分析,针对性提出了污闪、地线烧蚀方面的防范措施。
When the insulator pollution flashes,a part of the single-phase fault current enters the ground through the pole tower,and a part of the short-circuit current is shunt through the ground wire(OPGW,steel lightning rod).When the ground resistance of the pole tower is large,the ground wire has an obvious shunt effect,which will cause the ground wire to heat up,and in serious cases,it will cause broken strands and broken wires.Through the simulation analysis of the shunt of the ground wire during the pollution flashover process of the insulator of a line,it is shown that there is a large short circuit current flowing through the ground wire.Based on the analysis of the causes of the fault phenomena,the corresponding preventive measures are put forward in the aspects of pollution flashover and ground ablation.
作者
董芳如
刘举成
曾东
DONG Fangru;LIU Jucheng;ZENG Dong(College of Mechanic and Electrical Engineering,Hunan City University,Yiyang 413000,China;State Grid Qixia Power Supply Company,Qixia 265300,China;State Grid Hami Power Supply Company,Hami 839000,China)
出处
《电工技术》
2025年第11期233-237,共5页
Electric Engineering
基金
国网新疆电力有限公司科技项目“复杂极端环境下兼具防雷防冰害的架空地线技术研究”(编号5230DK24003)
国家电网公司总部科技项目“复合外绝缘可靠性评估及沿海地区输电线路污闪特性研究”(编号5500-202155502A-0-5-ZN)。
关键词
绝缘子
污闪
地线
分流
热稳定
insulator
contamination flashover
ground wire
shunting
thermal stability
