摘要
针对架空地线直接接地挂点金具发热并磨损问题,笔者深入分析架空地线直接接地金具产生过热以及出现磨损的原因,得出由于线路正常运行时架空地线存在感应电流和感应电压,挂点金具长时间存在不平衡力的作用和受外部环境的影响导致腐蚀,使接触电阻值增大,在出现感应过电压时产生电弧放电从而导致挂点金具局部发热。为有效处理500 kV输电线路架空地线直接接地挂点金具发热与磨损问题,通过分析500 kV天平I线(以下简称天平线)小转角杆塔左、右架空地线挂点金具出现发热异常现象,采取安装引流线和更换腐蚀、磨损严重的挂点金具的措施来消除异常发热现象,对轻微锈蚀的金具采用加强防锈喷漆方式处理来提高地线挂点金具的强度。
In view of the heating and wear problem of the hanging point fittings of overhead ground wire direct grounding, the authors deeply analyze the causes of overheating and wear of the hanging point fittings of overhead ground wire direct grounding. It is concluded that due to the existence of inductive current and inductive voltage of overhead ground wire during the normal operation of the line, the hanging point fittings have the effect of unbalanced force for a long time and are corroded due to the influence of the external environment, which increases the contact resistance value and generates arc discharge when the inductive overvoltage occurs, resulting in local heating of the hanging point fittings. In order to effectively deal with the heating and wear problem of the hanging point fittings for overhead ground wire direct grounding of 500 kV transmission line, through the analysis of the abnormal heating phenomenon of the hanging point fittings on the left and right overhead ground wire of small angle tower in 500 kV Tianping LineⅠ, the abnormal heating phenomenon is eliminated by taking the measures of installing the drainage line and replacing the corrosion, wear serious hanging point fittings, the slightly rusted fittings were treated by strengthening the anti-rust spray painting to improve the strength of the grounding wire hanging point fittings.
作者
王祥祥
谭永殿
龙振海
韦雄珏
WANG Xiangxiang;TAN Yongdian;LONG Zhenhai;WEI Xiongjue(Raise Bureau,EHV PowerTransmission Company,China Southern Power Grid Co.,Ltd.,Raise,Guangxi,533000)
出处
《红水河》
2020年第6期86-90,共5页
Hongshui River
关键词
架空地线
挂点金具
发热
磨损
接地
输电线路
overhead grounding wire
hanging point fitting
heating
wear
grounding
transmission line
