基于冗余表决的行波小波系数极大值极性法配电网接地故障选线原理研究  

Distribution grid earth fault line detection study by the traveling wave wavelets coefficient maximum polarities redundancy voting

作　　者：黄景光[1] 刘会家[1] 吕艳萍[2] 

机构地区：[1]三峡大学,湖北宜昌443002 [2]武汉大学,湖北武汉430072

出　　处：《继电器》2006年第7期13-17,共5页Relay

摘　　要：研究了配电网中单相接地短路故障时暂态行波的特性,利用母线电压及各线路电流暂态行波0模初始波头的小波系数的极大值极性的特征,构成了新的基于小波分析的故障选线保护判据,通过识别初始波头小波系数的极大值,判断极大值极性特征,并对多次判断结果进行冗余表决,完成故障选线工作。该文利用M atlab建立了一个典型的配电网系统仿真模型,通过编写选线保护仿真程序,完成对仿真结果的计算和分析,证明了此方法的正确和有效,并对应用研究提出了有益的建议。The paper studies the features of the transient traveling waves when a single phase earth fault taking place in distribution grid. And using the traveling wave wavelets coefficient maximum polarities of the bus bar voltage and lines currents＇zero modes, a new detection technique based on wavelets is introduced. After identifying the primary ripples and the coefficient maximum polarities, and redundancy voting the results of 7 times detections, the fault line will be identified. The paper simulates a small typical distribution grid. A simulation program is compiled, and the exactness and availability are proved. Some application advices are brought forward as well.

关 键 词：小波分析 故障选线 极大值极性 冗余表决 

分 类 号：TM862[电气工程—高电压与绝缘技术]