基于奇异点检测的单端行波测距方法改进  

Improvement on Single-Ended Traveling Wave Based Fault Location Through Singular Point Detection

作　　者：辛超山[1] 李凤婷[1] 

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047

出　　处：《中国电力》2013年第9期71-74,91,共5页Electric Power

基　　金：国家自然科学基金资助项目(51267019);新疆维吾尔自治区自然科学基金资助项目(2012211A002)

摘　　要：单端测距不受通信条件的限制成为研究的热点问题,通过小波变换可精确定位第1个波头。但在复杂线路中,由于波形叠加、交叉透射波等因素的影响,第2个反射波会迅速衰减,降低了测量精度。在分析不同阻抗线路行波折反射规律、行波提取及小波变换基础上,针对第2个波头的衰减,提出对变换后的第2个反射波进行平均化处理,提高测量精度;建立了改进的基于单端电气量行波测距的流程,并通过Matlab仿真分析了此方法的效果,结果表明,与模极大值法相比,改进的均值处理方法能提高测距精度。The single-ended traveling wave based fauh location became the focus of study due to the feature that it is not subject to communication constraints. Through wavelet transforming, the fil＇st wave head can be located precisely. But, in complex circuits, the second reflected wave will decay rapidly due to superimposed waw,furms and cross transmission waves, which leads to the decrease of measuring accuracy. In this paper, based on the analysis of refraction-reflection law for different impedance line, the extraction of traveling waves and wavelet transfimnatinn, the method of averaging processing for the transformed second wave to improve the measuring accuracy is proposed. An improved scheme of traveling wave based fauh location using single end electric parameters is established and simulation is performed in Matlah. The resuhs show that, compared with the modulus maxima method, the updated averaging processing can significantly improve the fauh location aeeuraey. The eom!etness anti effectiveness of the new scheme are proved.

关 键 词：故障测距 反向行波 突变性检测 均值化 

分 类 号：TM773[电气工程—电力系统及自动化]