阀区故障引起的接地极不平衡保护动作分析  

Analysis of Earth Electrode Unbalance Protective Actions Caused by Valve Area Failures

作　　者：贺红资 HE Hong-zi(Dali Bureau of China Southern Power Grid EHV Power Transmission Company,Dali 671000,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司大理局,云南大理671000

出　　处：《电工电气》2023年第5期44-47,共4页Electrotechnics Electric

摘　　要：介绍了一起直流工程阀区直流穿墙套管对地闪络故障引起的众多保护动作及直流控制保护系统响应过程,对该故障所引起的接地极电流不平衡保护动作进行了分析,找出了导致接地极电流不平衡的故障点及引起接地极故障的原因,即穿墙套管接地引起接地极区域过压,进而造成放电间隙不够的接地极线路招弧角被击穿放电,并提出了对损坏的招弧角进行放电间隙的调整或更换等优化建议。Protective actions and responses of DC control and protection system caused by the flashover failure to the ground from DC wall bushing in the valve area of the DC engineering are introduced.Then,the paper makes analysis of earth electrode current unbalance protective actions caused by this failure and finds out its fault point and causes.The reason for the failure is that the grounding of wall bushing leads to overvoltage in the earth electrode area,which causes the breakdown to the arcing horn of earth electrode lines with inadequate discharge gap.Therefore,to solve this problem,optimization suggestions such as adjustment or replacement of discharge gap for the damaged arcing horn are given.

关 键 词：直流穿墙套管 阀区故障 接地极电流不平衡保护 招弧角击穿 

分 类 号：TM721.1[电气工程—电力系统及自动化]