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Insulator Partial Discharge Localization Based on Improved Wavelet Packet Threshold Denoising and Gxx-β Generalized
Hongxin Ji1, Zijian Tang1, Chao Zheng1
1School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China.
Sensors (Basel, Switzerland)
|July 12, 2025
Summary
Accurate partial discharge (PD) source localization in power systems is improved using wavelet packet denoising and a novel Gxx-β algorithm. This method enhances signal quality and time difference estimation, achieving high localization accuracy for engineering applications.
Area of Science:
- Electrical Engineering
- Signal Processing
- Power Systems
Background:
- Partial discharge (PD) degrades insulation and can cause power system failure.
- Accurate PD source localization is challenging due to significant field noise interference.
Purpose of the Study:
- To propose a 3D spatial localization method for PD sources using a four-element ultra-high-frequency (UHF) array.
- To enhance PD signal denoising and time-of-arrival estimation for improved localization accuracy.
Main Methods:
- Wavelet packet decomposition and an improved threshold function for PD signal denoising.
- Gxx-β generalized cross-correlation algorithm with an improved weighting function for time difference calculation.
- Analysis of sensor array configurations and PD source positions for optimal localization.
Main Results:
- The improved wavelet packet denoising effectively separates PD signals from noise, increasing SNR with low distortion.
- The enhanced Gxx-β weighting function significantly improves the accuracy of time difference estimation between UHF sensors.
- The proposed method achieved a relative localization error of 3.46% and an absolute error within 6 cm.
Conclusions:
- The developed method offers effective PD source localization in noisy environments.
- The combination of advanced denoising and cross-correlation algorithms meets engineering application requirements for accuracy and reliability.
Keywords:
generalized cross-correlationlocalizationpartial dischargeultra-high frequencywavelet packetMore Related Videos
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