应用矢量图判别接地相的方法探讨  

EXPLORATION ON WAY OF DISCRIMINATING EARTHING PHASE BY APPLICATION OF VECTORGRAM

作　　者：林蹟 

机构地区：[1]中铁四局集团电气化工程有限公司,安徽蚌埠233040

出　　处：《铁道工程学报》2005年第2期62-65,共4页Journal of Railway Engineering Society

摘　　要：在中性点非直接接地电网中,绝大部分系统故障是单相接地故障。本文通过对单相接地故障的分析研究,总结出地电位(D)轨迹与系统电动势(E)之间,随系统参数、接地电阻变化的特性规律,利用该规律可在三相矢量图上迅速准确地判断出接地故障相,克服了仅用零序电压方向判断接地故障相可能产生的误差,提高了判断接地故障相的准确性,为系统及时采取防止过电压和消除单相接地故障措施提供了必要条件。Because most of failures are single-phase earthing failures in neutral non-direct earthing electric network, this paper sums up the characteristics law between earth potential trace and electromotive force and changeable law of earthing resistance with changes of system parameters based on the analysis and study on single-phase earthing failure. The earthing fault phase can be discriminated on three-phase vectorgram rapidly and accurately by application of the law. In this way, the possible error caused by application of null sequence voltage to discriminate earthing failure can be eliminated, the accuracy of discriminating earthing fault phase can be improved and the necessary conditions are provided to the system for preventing over voltage and eliminating single-phase earthing failure.

关 键 词：矢量图 方法探讨 中性点非直接接地电网 单相接地故障 判别 应用 故障相 系统故障 系统参数 电阻变化 方向判断 零序电压 必要条件 电动势 地电位 准确性 过电压 三相 

分 类 号：TM774[电气工程—电力系统及自动化] TP391.41[自动化与计算机技术—计算机应用技术]