基于小波变换的高压电缆混合线路故障定位方法及验证试验Fault Location Method and Verification Test Analysis of Hybrid HV Cable Lines Based on Wavelet Transform
曹俊平,黄勃,王成珠,李乃一,周路遥,江航,王振国
CAO Junping,HUANG Bo,WANG Chengzhu,LI Naiyi,ZHOU Luyao,JIANG Hang,WANG Zhenguo
摘要(Abstract)：
传统基于均匀参数的线路故障定位方法难以实现电缆-架空线混合线路的故障区间判断和故障点精确定位。对此,提出了一种基于小波理论的双端故障精确定位方法,通过对比高压电缆线路首、末端故障电流工频暂态信号的极性以实现故障区间判断,通过采集故障电流的双端行波信号以实现电缆段内故障点的精确定位,并构建了110 kV高压电缆状态仿真试验平台,开展了高压电缆线路区间内和区间外故障模拟试验。结果表明:基于小波理论的故障定位方法可实现混合线路故障区间判断,可准确判断故障点位于高压电缆线路区间内还是区间外;该方法可实现高压电缆线路区间内故障点的精确定位,定位精度偏差小于9.2 m,定位精度取决于行波电流传感器采集精度和同步时钟精度。
The traditional fault location method based on uniform parameters can hardly judge fault section and locate fault point accurately. For this reason, this paper proposes an accurate double-end fault location method based on the wavelet theory. Through the collection of power frequency transient signal polarity of HV cable fault current at the first and end of the line, the fault section location is realized Then through the acquisition of the fault current double-end traveling wave signal, fault point is located accurately. The 110 kV HV cable state simulation test platform is built to carry out fault simulation test inside and outside the HV cable line range. The results show that the fault location method based on the wavelet theory can locate the fault range of the HV cable hybrid line and determine whether the fault point is located inside or outside the range of the HV cable line accurately. The method can locate the fault points in the HV cable line accurately, and the positioning accuracy deviation is less than 9.2 meters, and the accuracy depends on the acquisition accuracy of the traveling wave current sensor and the accuracy of the synchronization clock.
关键词(KeyWords)：
高压电缆;混合线路;故障定位;模拟试验;小波变换
HV cable;hybrid line;fault location;simulation test;wavelet transform
基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211DS18002W）
作者(Author):
曹俊平,黄勃,王成珠,李乃一,周路遥,江航,王振国
CAO Junping,HUANG Bo,WANG Chengzhu,LI Naiyi,ZHOU Luyao,JIANG Hang,WANG Zhenguo
DOI: 10.19585/j.zjdl.202102003
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