摘要
针对一起500 kV输电线路架空地线断裂事件,进行了原因分析与感应电流的仿真计算。通过天气、外观、X光、解剖、金相和温升试验等分析手段,确认了因感应电流过大导致的金具发热及钢芯强度下降是造成断裂的主要原因。随后,利用仿真软件对线路进行了建模,仿真结果与现场实测数据相符,验证了模型的准确性。同时,通过仿真分析验证了故障所在线路的感应电流大小与线路负荷、接地方式、导线相序排列、空间结构参数、电感大小密切相关。最后,基于分析与仿真计算的结果,从设计规划、施工验收、施工改造和运维巡视四个方面,提出了抑制感应电流并防范其导致断线故障的建议与措施。
This paper investigates a fracture incident of an overhead ground wire in a 500 kV transmission line through cause analysis and simulation of induced currents.Various analytical methods,including weather condition analysis,visual inspection,X-ray examination,dissection,metallographic analysis,and temperature rise tests,confirmed that excessive induced current leading to hardware heating and degradation of steel core strength was the primary cause of the fracture.A simulation model of the transmission line was developed,and the results aligned with field measurements,validating the model’s accuracy.Furthermore,simulation analysis verified that the magni⁃tude of the induced current in the faulted line is closely related to line load,grounding method,conductor phase ar⁃rangement,spatial structure parameters,and inductance.Based on the analysis and simulation results,recommen⁃dations and measures for suppressing induced currents and preventing wire fracture are proposed in four respects:design and planning,construction acceptance,retrofitting,and operation and maintenance inspections.
作者
奚圣羽
杨勇
金涌涛
邓华
朱泽继
何坚
李特
XI Shengyu;YANG Yong;JIN Yongtao;DENG Hua;ZHU Zeji;HE Jian;LI Te(State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China;EHV Branch Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 311100,China)
出处
《浙江电力》
2026年第1期116-125,共10页
Zhejiang Electric Power
基金
国家自然科学基金(51977118)
国家电网有限公司总部科技项目(5108-202218280A-2-359-XG)。
关键词
输电线路
架空地线
感应电流
OPGW
金具
transmission lines
overhead ground wire
induced current
OPGW
hardware
