电网技术2016，Vol.40Issue(7)：2244-2261,18.DOI:10.13335/j.1000-3673.pst.2016.07.046
考虑波速特性的小波变换模极大值法的电力电缆局部放电定位研究
PD Location Method of Power Cable Based on Wavelet Transform Modulus Maxima Considering Wave Characteristics
高树国 1刘贺晨 2范辉 1裴少通 2刘云鹏 2潘瑾 1王芷路3
作者信息
- 1. 国网河北省电力公司电力科学研究院，河北省 石家庄市 050021
- 2. 华北电力大学 电气与电子工程学院，河北省 保定市 071003
- 3. 中国科学技术大学 信息科学技术学院，安徽省 合肥市 230022
- 折叠
摘要
Abstract
The efficiency detection and precision location of partial discharge in power cable are of great signification to the safety and reliability of the urban distribution network. In this paper, an oscillating waveform test system for 10 kV cable which was used for the PD testing of a 497 meters long cable with defects was established in the laboratory. The propagation characteristics of partial discharge signal in power cable ware analyzed. By comparing the PD location precision of different TDR methods, a method which combined the wavelet transform modulus maximal method and self-correlation method was proposed. In order to reduce the PD location errors caused by velocity ambiguity of PD signal, the velocity characteristics of the test cable were measured in the laboratory. Then the central frequency at each wavelet scale and the corresponding velocity was calculated. After that, the calculated velocity was used for the location of PDs. Due to the frequency component at each scale is relatively concentrated, the location errors caused by velocity ambiguity are reduced. At last, experimental results shown that oscillating voltage can effectively excite the generation of partial discharge and the location method proposed in this paper is a valid method for PD location with sufficient accuracy and reliability which fully meets the project need.关键词
振荡波/电缆/局部放电/小波变换模极大值法/自相关/定位Key words
oscillating voltage/cable/partial discharge/wavelet transform modulus maximal/self-correlation/location分类
动力与电气工程引用本文复制引用
高树国,刘贺晨,范辉,裴少通,刘云鹏,潘瑾,王芷路..考虑波速特性的小波变换模极大值法的电力电缆局部放电定位研究[J].电网技术,2016,40(7):2244-2261,18.
