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Identification of Electrical Tree Aging State in Epoxy Resin Using Partial Discharge Waveforms Compared to

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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.

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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.