摘要: |
研究了模量电流信号在高压交叉互联电缆中的传播特性,提出了以电流模量4作为高压电缆的行波测距信号。并设计了不受电缆波速变化影响的在线行波测距算法,有效解决了交叉互联电缆波阻抗不连续造成的行波折反射复杂问题,以及内外模量行波的交叉透射问题。算法通过提取故障暂态行波中能量百分比比较高的频带进行暂态行波的重构,有效降低了暂态行波的频带宽度,减小了行波色散对测距结果的影响。EMTP仿真及Matlab计算表明该算法适应性好,测距精度高。 |
关键词: 电缆 交叉互联 故障测距 行波色散 EMTP |
DOI:10.7667/PSPC151406 |
投稿时间:2015-08-11修订日期:2015-09-23 |
基金项目:上海市绿色能源并网工程技术研究中心(13DZ2251900) |
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Design of online travelling wave based fault location algorithm for HV power cable |
YANG Jian,TANG Zhong |
(School of Electrical Engineering, Shanghai University of Electrical Power, Shanghai 200090, China) |
Abstract: |
This paper analyzes the propagation characteristic of modal current in cross bounding power cable, and designs an online fault location algorithm for HV power cable by using current mode 4 as fault location signal. The algorithm is independent of the propagation velocity, which can solve the problem of complicated reflection and refraction of traveling wave on cross-bounded power cable and the problem of inner mode and outer mode wave crossing into each other. By extracting the frequency band of high energy in the transient traveling wave to reconstruct the transient wave, the bandwidths is significantly reduced, thus the influence of wave dispersion is decreased. EMTP simulation and Matlab calculation results show that the fault location algorithm is not only feasible but also has higher accuracy. |
Key words: power cable cross-bonded fault location traveling wave dispersion EMTP |