输电线路单相接地故障过渡电阻研究  

Study on Transition Resistance of Single Phase Grounding Fault in Transmission Line

作　　者：许志武 周学明 毕如玉 付剑津 刘姜 XU Zhiwu;ZHOU Xueming;BI Ruyu;FU Jianjin;LIU Jiang(Technical Training Center,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430074,China;Electric Power Research Institute,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430077,China;Maintenance Company,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430050,China)

机构地区：[1]国网湖北省电力有限公司技术培训中心,湖北武汉430074 [2]国网湖北省电力有限公司电力科学研究院,湖北武汉430077 [3]国网湖北省电力有限公司检修公司,湖北武汉430050

出　　处：《湖北电力》2020年第2期27-32,共6页Hubei Electric Power

摘　　要：输电线路单相接地故障点过渡电阻大小与接地点类型和接地媒质息息相关,并且直接影响到故障测量阻抗结果,进而影响保护测距的精准度。其影响除了与自身电阻值大小成正比外,还取决于两侧电源提供的短路电流比值和相位关系带来的助增因素。本文提出了一种基于故障录波图测量信息的过渡电阻计算方法,能够量化计算出接地故障点过渡电阻值,可根据过渡电阻值辅助运维人员判断故障性质和评估保护测距结果的准确性。The transition resistance of single-phase grounding fault point of transmission line is closely related to the type of connection point and grounding medium,and directly affects the result of fault measurement impedance,thus affecting the accuracy of protection ranging.In addition to being proportional to the value of its own resistance,the influence also depends on the ratio of short-circuit current provided by the two sides of the power supply and the phase relationship brought by the boosting factors.This paper presents a method for calculating the transition resistance based on the measurement information of fault recording diagram,which can quantitatively calculate the transition resistance value of grounding fault point,and assist the operation and maintenance personnel in judging the fault nature and evaluating the accuracy of the protection ranging result according to the value of transition resistance.

关 键 词：输电线路 单相接地 故障录波图 过渡电阻 

分 类 号：TM862[电气工程—高电压与绝缘技术]