油纸绝缘特性研究及微水含量评估

Research on oil-paper insulation characteristics and evaluation of its micro-water content

为充分发挥FDS宽频介电信息量丰富的优势,将其更好地应用于油纸绝缘微水含量的定量评估,首先对不同微水含量油纸绝缘试品的频域介电谱(即"频谱")进行了基于微观物理机制的深入剖析,在此基础之上采用向后选择多元回归法建立微水含量评估模型。最终的模型显著性检验结果表明,所提取的9个特征参量均对微水含量产生显著性影响且只有测试频率为10-1 Hz处所建立的多元回归方程线性显著。最后基于新测试数据对模型的有效性进行了检验,其中计算值与实际值的相对误差大部分小于4%且方程的决定系数R2高达0.9971,充分验证了本文所构建模型的可靠性。

The advantage of FDS’s rich dielectric information in a wide band is made full use for applying in the quantitative evaluation of the micro-water content of oil-paper insulation.The frequency domain dielectric spectroscopy of oil-paper insulation samples with different micro-water content is analyzed in depth based on the principle of micro-physics.Then,the backward selection multiple regression method is used to formulate the micro-water content evaluation model.The significance test results of the final model show that nine extracted characteristic parameters have significant influence on the micro-water content.Only the established multiple regression equation at the test frequency of 10-1 Hz is linearly significant.At the end of the article,the validity of the model is tested by using the new test data.The relative error between the calculated value and the actual value is mostly less than 4%and the decision coefficient R2 of the equation is as high as 0.9971.The reliability of the model is fully verified.