边界保护的理论基础 第三部分:故障暂态频谱差异EMTP仿真  

The spectrum analysis of fault transients for transmission lines Part Ⅲ:extraction of fault transient spectrum

作　　者：哈恒旭[1] 张保会[1] 吕志来[1] 

机构地区：[1]西安交通大学电气学院,陕西西安710049

出　　处：《继电器》2002年第11期1-4,共4页Relay

摘　　要：全文的第一部分 ,研究了线路在三个典型位置故障暂态分量的特征 ,发现区内外故障暂态分量差异取决于线路边界的反射和折射系数 ;第二部分研究了反射系数和折射系数的频谱特征 ,发现区内外故障暂态分量的差异的确存在 ,而且比较明显 ,特别是具有阻波器线路在阻波频带内的差异非常明显。本文是全文的第三部分 ,对具有阻波器线路 ,利用三阶Cui样条小波变换提取故障暂态分量中的 [0 ,2T]× [阻波频带 ]时频区域内的信息 ,并进行频谱分析。EMTP仿真结果表明 ,区内外故障差异不仅存在而且十分明显 ,足够构成边界保护判据 ,在单端实现全线的速动。In the part Ⅰ and Part Ⅱ of the whole paper,we studied the characters of the fault induced transients at three typical fault point,and the spectrum of reflective and refractive coefficient of line boundary,based on which we make a conclusion that the different characters between internal and external faults really exists and large enougn.This paper is the 3 rd part,using wavelet transform to extract the information of transient signals in the time frequency region of T]×[Trap choke band],where T is the traveling time from on end to another,for the transmission lines with three phase line traps.The EMTP simulations tests show that the different character of transient signal spectrum between internal and external fault is obvious and using the information can construct the criterion of Boundary protection which can absolutely protect the whole line at single end.

关 键 词：边界保护 小波变换 三阶Cui样条小波 EMTP仿真 故障暂态分量频谱差异 输电线路 

分 类 号：TM771[电气工程—电力系统及自动化]