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Identification of Electrical Tree Aging State in Epoxy Resin Using Partial Discharge Waveforms Compared to
Roger Schurch1, Osvaldo Munoz2, Jorge Ardila-Rey1
1Department of Electrical Engineering, Universidad Tecnica Federico Santa Maria, Valparaiso 2390123, Chile.
Polymers
|June 10, 2023
Summary
Partial discharges cause electrical trees in epoxy insulation, leading to equipment failure. PD pulse waveform analysis effectively detects tree crossing, offering a robust diagnostic tool for high-voltage insulation asset management.
Area of Science:
- Electrical Engineering
- Materials Science
- Physics
Background:
- Electrical treeing is a primary degradation mechanism in high-voltage polymeric insulation.
- Epoxy resin is a critical insulating material in power equipment like transformers and switchgears.
- Electrical trees, driven by partial discharges (PDs), lead to insulation breakdown and power system failures.
Purpose of the Study:
- To evaluate and compare different PD analysis techniques for identifying electrical tree bulk-insulation crossing in epoxy resin.
- To determine the most robust method for detecting insulation failure precursors.
- To assess the potential of PD analysis for asset management of high-voltage insulation.
Main Methods:
- Simultaneous use of two PD measurement systems: one for PD pulse sequences and another for PD pulse waveforms.
- Deployment of four PD analysis techniques: Phase-Resolved PD (PRPD), Pulse Sequence Analysis (PSA), Nonlinear Time Series Analysis (NLTSA), and PD pulse waveform parameter analysis.
- Evaluation of NLTSA using correlation dimension to assess system complexity changes.
Main Results:
- PRPD and PSA identified tree crossing but were sensitive to AC voltage amplitude and frequency.
- NLTSA showed a reduction in correlation dimension post-crossing, indicating a less complex system.
- PD pulse waveform parameters demonstrated the best performance, reliably identifying tree crossing irrespective of AC voltage variations.
Conclusions:
- PD pulse waveform analysis is a robust and reliable method for detecting electrical tree crossing in epoxy insulation.
- This technique is independent of AC voltage amplitude and frequency, making it suitable for diverse applications.
- PD pulse waveform analysis can be effectively utilized as a diagnostic tool for the asset management of high-voltage polymeric insulation.
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