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Localization of partial electrical discharges using compressive spherical frequency-difference beamforming
Jeung-Hoon Lee1, Yongsung Park2, Peter Gerstoft2
1School of Mechanical Engineering, Changwon National University, Uichang-gu, Changwon, 51140, South Korea.
The Journal of the Acoustical Society of America
|October 23, 2024
Summary
This study enhances partial electrical discharge localization using acoustic sensors and advanced beamforming. The new method improves accuracy for high-voltage systems by addressing near-field challenges and wave biases.
Area of Science:
- Electrical Engineering
- Acoustics
- Signal Processing
Background:
- Accurate localization of partial electrical discharges (PD) is critical for diagnosing high-voltage systems.
- Ultrasonic sound emission during PD events necessitates sophisticated localization techniques to avoid spatial aliasing.
- Existing compressive frequency-difference beamforming methods show promise but require expansion for near-field applications.
Purpose of the Study:
- To develop an improved method for accurate near-field localization of partial electrical discharges.
- To adapt compressive frequency-difference beamforming for spherical wave analysis.
- To enhance localization accuracy by mitigating biases from nonplanar waves.
Main Methods:
- Utilized an acoustic sensor array and an expanded compressive frequency-difference beamforming approach.
- Incorporated spherical wave analysis for near-field scenarios.
- Implemented a two-step normalization process to standardize field variables and preserve phase/relative amplitude.
- Employed a distributed algorithm based on the alternating direction multiplier method for convex optimization.
Main Results:
- The proposed method successfully extends near-field localization capabilities for partial electrical discharges.
- The two-step normalization effectively eliminates bias from nonplanar waves.
- The distributed optimization algorithm efficiently solves the complex problem.
- Validation was achieved using both simulated and experimental data.
Conclusions:
- The enhanced beamforming technique provides accurate near-field localization of partial electrical discharges.
- This advancement is crucial for improved diagnostics and maintenance of high-voltage equipment.
- The method offers a robust solution for challenging acoustic localization problems in complex environments.
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