基于多时域特征参量的变压器油纸绝缘状态综合评估

利用RVM5461测试仪的现场测试结果对变压器的回复电压极化谱进行了分析。利用扩展德拜模型对变压器弛豫机构参数进行了分析。对去极化电流能量谱中反映变压器油纸绝缘老化状态的特征量进行了分析。对多台变压器的实测数据进行统计,建立变压器标准状态参量表。采用主客观相结合的综合赋权法确定各个时域特征量的权重系数,并融合证据理论和多指标评估方法,建立变压器油纸绝缘状态综合评价体系。实例分析结果表明了所提方法的有效性。

Synthetic insulation state evaluation based on multiple time-domain characteristic parameters for transformer oil-paper

The return voltage polarization spectrum is analyzed based on the results of field test by RVM5461 tester, the parameters of transformer relaxation mechanism are analyzed based on the extended Debye model, the characteristic variables of depolarization current energy spectrum, which reflect the aging condition of transformer oil-paper insulation, are analyzed, and a standard state parameter table is established based on the measured data of multiple transformers. A comprehensive weighting method combining subjective weighting and objective weighting is adopted to determine the weights of different time-domain characteristic parameters and a comprehensive evaluation system combining multi-index evaluation method and evidence theory is established for assessing the insulation state of transformer oil-paper. The results of case test show the effectiveness of the proposed method.