选择性定子单相接地保护方案浅析  

A Fundamental Research on Stator Single-phase Earthing Protection Schemes

作　　者：李振强[1] 吕艳萍[1] 张彦昌[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《大电机技术》2007年第3期13-16,共4页Large Electric Machine and Hydraulic Turbine

摘　　要：在分析了发电机定子绕组单相接地故障特点的基础上,简要阐述了常见的定子单相接地保护方案及其各自的主要特点,指出选择性保护的重要性,进而详细分析了三种具有选择性的定子单相接地保护(即零序功率方向保护、选择性行波保护和基于小波变换理论的定子接地保护)的原理及其优缺点,最后指出了目前在实际中应用的几种具有选择性的定子单相接地保护方案存在的主要问题,并对以后进一步的研究做出了展望——小波变换在选择性定子单相接地保护中有着广泛的理论价值和应用前景。On the basis of analyzing the characteristics of generator stator winding single-phase earth fault, the thesis simply presents some normal generator stator single-phase earth fault protection schemes, points out the importance of protection, analyzes detailedly the principle, merits and drawbacks of three selective generator stator single-phase earth fault protection schemes in practice （homopolar power direction protection, selective traveling wave protection and stator earthing protection based on wavelet transform）, and finally points out the problems existing in present selective generator stator single-phase earth fault protection and the direction of further study is also brought forward-wavelet transform has the further value in theory and practice.

关 键 词：定子单相接地 选择性 保护方案 发电机 

分 类 号：TM307[电气工程—电机]