电子测量与仪器学报

孙抗,郭景蝶,马星河.高压电缆局部放电小波包峰度法在线检测与定位[J].电子测量与仪器学报,2017,31(7):1099-1106

高压电缆局部放电小波包峰度法在线检测与定位

On line partial discharge detection and localization based on the wavelet packet kurtosis

DOI：10.13382/j.jemi.2017.07.016

英文关键词:partial discharge kurtosis wavelet packet location actual time arrival

基金项目:

作者	单位
孙抗	河南理工大学电气工程与自动化学院焦作454000
郭景蝶	河南理工大学电气工程与自动化学院焦作454000
马星河	河南理工大学电气工程与自动化学院焦作454000

Author	Institution
Sun Kang	School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Guo Jingdie	School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Ma Xinghe	School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China

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中文摘要:

在利用双端行波法进行高压电缆局放在线检测与定位时，针对脉冲初至时刻拾取精度不高影响定位精度的问题，引入地震信号检测领域中的时变峰度法。首先利用时窗能量比检测局放事件，然后在确定的局放时窗内，通过计算时变峰度变化率并求其最大值点，初步实现脉冲初至时刻拾取。为了克服现场强噪声干扰对拾取精度的影响，利用小波包分离出局放脉冲所在的主要频带，并在此频带内求取时变峰度极大值，实现了局放脉冲初至时刻的高精度拾取。最后运用到达时间分析法实现局部放电源的在线精确定位。实验结果表明，该方法抗噪声干扰能力强，定位精度高，在-14 dB的噪声环境下定位误差小于2 m，能够满足高压电网对局放故障在线定位的精度要求，有效提高供电可靠性。

英文摘要:

On the basis of using double terminal traveling wave method to carry out on line detection and location of PD of high voltage cable, the time varying kurtosis method used in the field of seismic signal detection is introduced to solve the problem that the precision of the first break time affects the positioning accuracy. Firstly, the PD events is detected by using the method of time window energy ratio, then the pulse arrival time is preliminary picked up by calculating the time varying kurtosis change rate and the maximum point in determining the discharge time window. In order to overcome the influence of strong noise on picking precision, the main frequency band of partial discharge pulse is separated by wavelet packet, and the time varying kurtosis maximum is obtained in this frequency band, which ensures that the high precision picking up of the first break time of PD pulse is achieved. Finally, the PD source is located by the method of two terminal traveling wave. The simulation results show that this method can meet the high voltage power lines on the PD line fault positioning accuracy requirements and effectively improve the reliability of power supply, not only has high precision and strong anti interference ability, but also can realize that the error is less than 2 m in -14 dB noise environment.

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