水轮发电机失磁保护阻抗特性分析  

Impedance Characteristics Analysis of Excitation-loss Protection for Hydro-generator

作　　者：郭思源[1] 李理[1] 洪权[1] 李辉[1] 刘海峰[1] 蔡昱华[1] 张命强 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南长沙410007 [2]湖南省电网工程公司,湖南衡阳421002

出　　处：《湖南电力》2017年第4期4-7,共4页Hunan Electric Power

摘　　要：本文以水轮发电机为研究对象,详细推导了其静稳边界阻抗圆的动作特性。针对具体发电机变压器组保护装置的失磁保护判据进行研究,经研究表明投入无功反向判据并不能减小实际运行机组的静稳边界圆动作范围。随后通过一个算例,将低励限制曲线从功率平面P-Q转换到阻抗平面R-X,统一在阻抗平面来说明失磁保护与低励限制的配合关系。The hydro-generator being study subject , this paper deduces the action characteristics of the static stability boundary impedance circle in detail. For specific excitation-loss protection criterion of generator transformer protection group, the research shows that putting into reactive reverse criterion does not reduce the static stability boundary circle range of the actual operation generator. Then through an example, by converting the low excitation limit curve from the power plane P-Q to impedance plane R-X, the cooperate relationship between excitation-loss protection and low excitation limit is illustrated in the impedance plane uniformly.

关 键 词：水轮发电机 失磁保护 无功反向判据 低励限制 

分 类 号：TM77[电气工程—电力系统及自动化]