高压电器2017，Vol.53Issue(12)：119-123,5.DOI:10.13296/j.1001-1609.hva.2017.12.019
GIS局部放电特高频信号时延的分数阶希尔伯特估计算法
Time Delay Estimation of Partial Discharge UHF Signals in GIS Based on Fractional Hilbert Transform
马小敏 1甘德刚 1丁登伟 1何良 1王杰 1张燃1
作者信息
- 1. 国网四川省电力公司电力科学研究院,成都610072
- 折叠
摘要
Abstract
Time delay estimation is the basis of the localization algorithm for partial discharge (PD) in GIS based on time difference,and it is the key to the accuracy of localization.In this paper,the theoretical basis of employing fractional Hilbert transform for time delay estimation is described,an algorithm for estimating the time delay of ultra high frequency partial discharge in GIS is proposed based on fractional Hilbert transform,and corresponding numerical implementation steps of the algorithm are given.According to the abnormal PD signals found in the switch air chamber during an ultra high frequency PD inspection of a certain 220 kV GIS equipment,high speed oscilloscope is adopted to collect high frequency electromagnetic wave signal at pouring holes of the disk-type insulator on the two sides of the switch air chamber.According to the time delay of the signal,the space position of the PD source is located 1.25 meters away from the disk-type insulator pouring hole.After disintegration of the switch air chamber,the distance is measured as 1.3 meters.The location error of PD source based on fractional Hilbert algorithm is significantly lower than that based on the bi-spectrum time delay estimation algorithm and the interpolation cross-relation time delay estimation algorithm,respectively.关键词
气体绝缘金属封闭开关设备/时延估计/特高频/局部放电/定位精度/分数阶希尔伯特变换Key words
GIS/time-delay estimation/ultra high frequency/partial discharge/location accuracy/fractional Hilbert transformation引用本文复制引用
马小敏,甘德刚,丁登伟,何良,王杰,张燃..GIS局部放电特高频信号时延的分数阶希尔伯特估计算法[J].高压电器,2017,53(12):119-123,5.
