摘要
"摸清家底"是发现单相接地故障处理各个环节缺陷的重要工作,在此基础上"补齐短板",有针对性地消除缺陷,对于提升单相接地故障处理性能具有重要意义。介绍了电容电流水平的估算法、间接测量法和直接测量法,阐述了采用现场勘查方式摸清消弧线圈系统、零序电压系统、零序电流互感器、变电站内外自动化装置等运行现状。介绍了对某市电缆化率较高的变电站开展的"摸清家底"和"补齐短板"的工作实效,整改前单相接地选线正确率仅28.6%,整改后单相接地选线均投跳闸,跳闸正确动作率达到95.2%。
Making clear the resources is an important task for finding defects in all aspects of single-phase grounding fault handling.On this basis,making up the shortcomings and eliminating defects are of great significance for improving the performance of singlephase grounding fault handling.This paper discusses the approaches of estimation,indirect measurement and direct measurement to grasp the capacitance current.The field survey methods to obtain the situation of arc suppression coil system,zero sequence voltage system,zero sequence current system,and automation devices of substations are described.The practice of finding out and making up the defeats of substations with high cable rate is introduced.The correctness of the single-phase grounding line selection was only 28.6%before rectification.After the reconstruction project,as the tripping mechanism is added to earthed fault handling,the correctness of tripping action reached 95.2%.
作者
刘健
张小庆
陈洁羽
陈一悰
左宝峰
王毅钊
LIU Jian;ZHANG Xiaoqing;CHEN Jieyu;CHEN Yicong;ZUO Baofeng;WANG Yizhao(State Grid Shaanxi Electric Power Research Institute,Xi'an 710100,China)
出处
《供用电》
2021年第11期9-13,共5页
Distribution & Utilization
基金
国家自然科学基金重点支持项目“城市智能配电网保护与自愈控制关键技术”(U1766208)。
关键词
中性点非有效接地系统
变电站
配电网
单相接地
电容电流
消弧线圈
neutral non-effectively grounded systems
substations
distribution network
single-phase grounding
capacitive current
arc suppression coils
