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Natural esters, as new environmentally friendly alternatives to conventional liquid insulation dielectrics, have been widely studied. However, their high viscosity and poor lightning impulse performance pose challenges to the structural design of transformers. In this work, a new type of long-chain fatty acid mono-ester (LAME) with low viscosity and high lightning impulse breakdown voltages (LI BDV) is studied.LAME shows similar positive LI BDV but significantly higher negative LI BDV when compared with soybean oil (SBO). The negative LI BDV of LAME is about 30% higher than that of SBO with a 65 mm gap. The negative LI BDV of the mixed insulation oil made from SBO and LAME is significantly higher than that of pure SBO. A nonlinear relationship between the negative LI BDV of the mixed insulation oil and the mixing ratio is observed.

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Lightning Impulse Breakdown Properties of a Long-Chain Modified Mono-Ester and Its Mixture with Soybean Oil as Alternative Liquid Dielectrics

  • 会议论文

  • 发表日期：

    2025年

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  • Fangyuan Han,
  • Liangyuan Chen,
  • Bei Li,
  • Yiyi Zhang,
  • Bo Feng,
  • Min Yu

摘要

Natural esters, as new environmentally friendly alternatives to conventional liquid insulation dielectrics, have been widely studied. However, their high viscosity and poor lightning impulse performance pose challenges to the structural design of transformers. In this work, a new type of long-chain fatty acid mono-ester (LAME) with low viscosity and high lightning impulse breakdown voltages (LI BDV) is studied.LAME shows similar positive LI BDV but significantly higher negative LI BDV when compared with soybean oil (SBO). The negative LI BDV of LAME is about 30% higher than that of SBO with a 65 mm gap. The negative LI BDV of the mixed insulation oil made from SBO and LAME is significantly higher than that of pure SBO. A nonlinear relationship between the negative LI BDV of the mixed insulation oil and the mixing ratio is observed.