励磁系统交流侧接地对转子接地保护的影响  

Influence of AC Side Grounding of Excitation System on Rotor Grounding Protection

作　　者：侯小虎[1] 肖江滔[1] 杨维胜 郭文[1] 张舸[1] HOU Xiaohu;XIAO Jiangtao;YANG Weisheng;GUO Wen;ZHANG Ge(China Yangtze Power Co.Ltd.,Xiluodu Hydropower power Plant,Zhaotong 657300,China)

机构地区：[1]中国长江电力股份有限公司溪洛渡水力发电厂,云南省昭通市657300

出　　处：《水电与抽水蓄能》2024年第5期43-46,共4页Hydropower and Pumped Storage

摘　　要：励磁系统交流侧接地将引起注入式转子接地保护、乒乓切换式转子接地保护误动作。本文介绍了一起相关案例,并对引起误动的基本原理进行了深入分析和定量计算,总结了励磁系统交流侧接地引起采样数据变化的典型特征,提出了关于缩小转子接地保护定位范围的思考。当转子一点接地保护动作后,应首先根据采样数据的变化,对故障点位于励磁系统交流侧还是直流侧做出初步判断,缩小故障定位范围,为快速查找故障提供决策依据。The AC side grounding of excitation system will cause the misoperation of injection rotor grounding protection and ping-pong switching rotor grounding protection.This paper introduces a relevant case,deeply analyzes and quantitatively calculates the basic principle of misoperation,summarizes the typical characteristics of sampling data changes caused by AC side grounding of excitation system,and puts forward some thoughts on reducing the positioning range of rotor grounding protection.When the rotor one point grounding protection acts,first make a preliminary judgment on whether the fault point is located at the AC side or DC side of the excitation system according to the change of sampling data,so as to narrow the fault location range and provide decision-making basis for rapid fault finding.

关 键 词：电力系统及其自动化 交流侧接地 注入式转子接地保护 乒乓切换式转子接地保护 

分 类 号：TM77[电气工程—电力系统及自动化]