绝缘电阻试验判断变压器绝缘的判据探讨

理论和实测分析认为 ,大型变压器绝缘状况应用绝缘电阻、吸收比和极化指数 3个测量值的不同情况综合判断 ,某一单项测量结果不合格不决定整个绝缘合格的判断 ,绝缘电阻值很高而吸收比不合格的情况正是绝缘状况良好的依据。最后提出了用绝缘电阻、吸收比和极化指数综合分析大型变压器绝缘状况的参考性判据

Study on Transformer Insulation Condition Estimation with Insulation-Resistance Measurement

According to theory analysis and actual measurements, this paper points out that large scale transformers' insulation condition estimation can not depend on absorptivity alone. It should use overall analysis, which consist of 3 factors such as insulation resistance, absorptivity and polarization exponent. Sometimes one measurement data maybe unqualified, however, it can't determine that insulation condition of transformer is unqualified in whole. The transformer's insulation is in good condition while insulation resistance is quite high but absorptivity is unqualified. A reference estimation is presented for large transformers' insulation condition with overall analysis of insulation resistance, absorptivity and polarization exponent.