基于频域介电谱油纸结构对变压器绝缘的影响研究

Study on the Influence of Oil-paper Structure on Transformer Insulation Based on Frequency Domain Dielectric Spectrum

为研究油纸层数对频域介电特性的影响,进而评估油纸结构对变压器绝缘特性的影响。在实验室内制备不同油纸层数的试品进行FDS测试。通过对得到FDS试验结果深入分析后提出以特征频率f=0.1mHz、f=0.01Hz、f=10Hz处的复电容实部C′为频域介电特征参量。将油纸层数与频域介电特征参量进行拟合,通过两者的拟合关系评估油纸绝缘结构对变压器绝缘性能的影响。研究结果表明:油纸层数与频域介电特征参量具有高拟合优度的函数关系,证明该方法评估油纸层数对频域介电特性的影响具有很高的可行性,该方法还为应用FDS法评估油纸结构对油纸绝缘性能提供了一定依据。

In order to study the influence of the number of oil-paper layers on the frequency domain dielectric characteristics,and then evaluate the influence of oil-paper structure on the transformer insulation characteristics.Test samples with different layers of oil-paper were prepared in the laboratory for FDS test.After in-depth analysis of the obtained FDS test results,it is proposed that the real part C′of the complex capacitance at the characteristic frequencies f=0.1mHz,f=0.01Hz and f=10Hz is the frequency domain dielectric characteristic parameter.The number of oil-paper layers and the dielectric characteristic parameters in frequency domain are fitted,and the influence of oil-paper insulation structure on the insulation performance of transformer is evaluated through the fitting relationship between the two.The research results show that there is a function relationship between the number of oilpaper layers and the frequency domain dielectric characteristic parameters with a high degree of goodness of fit,which proves that this method is highly feasible to evaluate the effect of the number of oil-paper layers on the frequency domain dielectric characteristics.This method also provides a certain basis for the application of FDS method to evaluate the insulation performance of oil-paper structure.