低频分量导致并联高抗匝间保护误动机理分析  

Mechanism Analysis of Inter⁃turn Protection Mal⁃operation of High Voltage Shunt Reactor by Low Frequency Component

作　　者：王超 陈禹志 徐攀峰 罗来龙 文方 覃文继 WANG Chao;CHEN Yuzhi;XU Panfeng;LUO Lailong;WEN Fang;QIN Wenji(State Grid Xizang Electric Power Limited Corporation,Lasa 850000,China)

机构地区：[1]国网西藏电力有限公司,拉萨850000

出　　处：《电力电容器与无功补偿》2022年第3期36-42,共7页Power Capacitor & Reactive Power Compensation

摘　　要：匝间保护是高压并联电抗器匝间短路的主保护,主要由零序阻抗判据和分相阻抗判据构成。在线路单相接地故障跳闸后,高抗对应相与线路电容发生低频振荡,可能导致高抗匝间保护误动。本文深入分析了低频分量对高抗饱和的作用机理及其对匝间保护的影响,同步阐释了线路非全相状态对零序阻抗判据的影响,提出了高抗匝间保护优化方案,并进行了仿真验证。所提匝间保护方案兼顾了可靠性和速动性要求,希望能对相关从业人员提供有益参考。Inter⁃turn protection is the main protection for inter⁃turn short circuit of high voltage shunt reactor,which is mainly composed of zero sequence impedance criterion and split phase impedance criterion.After the single⁃phase grounding fault trip of line,the corresponding phase and line capacitance of the high⁃voltage reactor have low⁃frequency oscillation,which may lead to the inter⁃turn mal⁃operation of the high⁃voltage reactor.In this paper,the action mechanism of low frequency component on saturation of high voltage reactor and its influence on the inter⁃turn protection is analyzed in depth.The influence of line open phase state on zero sequence impedance criterion is explained simultaneously,and the optimization scheme of the inter⁃turn protection is proposed and verified by simulation.The proposed inter⁃turn protection scheme takes into account the requirements of reliability and rapidity,hoping to provide useful reference for relevant practitioners.

关 键 词：高压并联电抗器 匝间保护 低频分量 零序分量 逻辑优化 

分 类 号：TM472[电气工程—电器]