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In response to the fire accident caused by the sealing failure of the 220 kV transformer bushing, this paper reveals the process of the electric field distortion caused by the moisture of the bushing through finite element simulation. Based on the CIGRE arc energy model and multi-physics field simulation, it is confirmed that when there is a water droplet with a radius of 2 mm at the bottom of the bushing, the electric field reaches 16.31 kV/mm (about 2.4 times that of the normal working condition), triggering surface discharge of the oil-paper insulation system. The paper proposes the perspective of moisture migration and polarization at the bottom of the bushing and verifies the coupling mechanism of sealing defects and electric field distortion through fault cases, providing a theoretical basis for the moisture-proof design of the bushing.

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Simulation on the Mechanism of Electric Field Distortion Caused by Moisture of Oil-Immersed Transformer Bushings

  • 会议论文

  • 发表日期：

    2026年

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  • Shaoming Pan,
  • Liangyuan Chen,
  • Yi Su,
  • Wei Huang,
  • Rui Li,
  • Yuan Ma,
  • Lei Zhang,
  • Wei Zhang

摘要

In response to the fire accident caused by the sealing failure of the 220 kV transformer bushing, this paper reveals the process of the electric field distortion caused by the moisture of the bushing through finite element simulation. Based on the CIGRE arc energy model and multi-physics field simulation, it is confirmed that when there is a water droplet with a radius of 2 mm at the bottom of the bushing, the electric field reaches 16.31 kV/mm (about 2.4 times that of the normal working condition), triggering surface discharge of the oil-paper insulation system. The paper proposes the perspective of moisture migration and polarization at the bottom of the bushing and verifies the coupling mechanism of sealing defects and electric field distortion through fault cases, providing a theoretical basis for the moisture-proof design of the bushing.