小电流接地选线装置在10kV系统站间转供电期间的应用分析  

Analysis of the Application of Small Current Grounding Line Selection Device d uring the Transfer of Power Supply between Stations in 10 kV system

作　　者：付艺磊 李泽琴 Fu Yilei;Li Zeqin(Lijiang Power Supply Bureau,Yunnan Grid Co.,LTD.,Lijiang 674100,China)

机构地区：[1]云南电网有限责任公司丽江供电局,云南丽江674100

出　　处：《云南电力技术》2021年第5期70-73,81,共5页Yunnan Electric Power

摘　　要：近年来电网系统积极加装、不断改造小电流接地选线装置以快速锁定并隔离不接地系统单相接地故障设备,大面积加装小电流接地选线装置解决电网难题同时带来新的运行风险。文章分析系统单相接地故障时零序电流的分布特征,剖析小电流接地选线装置在10 kV系统站间转供电期间的运行风险,提出防范措施。In recent years,the power grid system has been actively installed and constantly modified the small curren t grounding line selection device to quickly lock and isolate the single phase grounding fault equipment of the ungro unded system.The large area of small current grounding line selection device work to solve the grid problems and br ing new operation risks.This paper analyzes the distribution characteristics of zero sequence current when the single-phase grounding fault occurs in the system,analyzes the operation risk of the small current grounding line selection device during the transfer of power supply between stations in the 10 kV system,and puts forward the preventive measures.

关 键 词：中性点不接地系统 小电流接地选线 继电保护整定方案 

分 类 号：TM74[电气工程—电力系统及自动化]