高电压技术2017，Vol.43Issue(7)：2402-2409,8.DOI:10.13336/j.1003-6520.hve.20170628039
消弧线圈接地系统同母多回线相继故障分析
Fault Analysis on Successive Fault of Multi-feeders Connected to the Same Bus in Resonant Grounding System
摘要
Abstract
Successive faults occur frequently at multi-feeder connected to the same bus in urban distribution networks,which is particularly severe in resonant grounding systems.To find out the cause of such accidents,we firstly studied steady-state overvoltage caused by single-phase-to-ground fault,and analyzed the influences of fault resistor and reactive power compensation on the steady-state overvoltage of healthy phases.Then,we analyzed the distribution characteristics of transient overvoltage caused by intermittent earth fault.The results show that the intermittent arc overvoltage at the end of a non-fault line is much higher than that of the faulty line.Thereby,phase-to-phase fault may occur first in a non-fault line.Therefore,taking an actual accident as an example,we used a simulation case in PSCAD/EMTDC to study the process of the accident.Combined with the fault information,the cause of the accident was revealed.At last,corresponding solutions were put forward.关键词
相继故障/间歇性接地/工频过电压/弧光过电压/消弧线圈接地系统Key words
successive faults/intermittent earth fault/power-frequency overvoltage/arcing overvoltage/resonant grounding system引用本文复制引用
吴争荣,蔡颖倩,张俊潇,董旭柱,王钢,刘志文..消弧线圈接地系统同母多回线相继故障分析[J].高电压技术,2017,43(7):2402-2409,8.基金项目
国家自然科学基金(51477057) （51477057）
中国南方电网公司科技项目(WYKJ00000020).Project supported by National Natural Science Foundation of China (51477057),Science and Technology Project of China Southern Power Grid Co.,Ltd.(WYKJ00000020). （WYKJ00000020）
