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Abstract <p>Using finite element numerical modeling, it is shown on mock-ups of solid insulation of electrical equipment with defects in the form of an air cylindrical cavity that the use of the concept of “defect capacity” is incorrect, since the boundaries of the defective region do not coincide with the equipotential field lines. The lack of consideration of the actual configuration of the electric field in the mock-up leads to unacceptably large errors in calculating the electric-field strength in the defect and, as a result, to erroneous estimates of the PD occurrence voltage. The calculation of the PD occurrence voltage according to the avalanche-streamer transition condition correctly reproduces the effect of the defect size, which is confirmed by the measurement results. The discrepancy between the calculated and experimental results reaches 12%, which requires additional research and refinement of the calculated ratios.</p>

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Computational and Experimental Study of the Voltages of the Occurrence of PD in Models of Solid Insulation

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. M. Bykova,
  • A. V. Zhuikov,
  • P. A. Kolpakova,
  • D. A. Matveev,
  • M. V. Frolov

摘要

Abstract

Using finite element numerical modeling, it is shown on mock-ups of solid insulation of electrical equipment with defects in the form of an air cylindrical cavity that the use of the concept of “defect capacity” is incorrect, since the boundaries of the defective region do not coincide with the equipotential field lines. The lack of consideration of the actual configuration of the electric field in the mock-up leads to unacceptably large errors in calculating the electric-field strength in the defect and, as a result, to erroneous estimates of the PD occurrence voltage. The calculation of the PD occurrence voltage according to the avalanche-streamer transition condition correctly reproduces the effect of the defect size, which is confirmed by the measurement results. The discrepancy between the calculated and experimental results reaches 12%, which requires additional research and refinement of the calculated ratios.