大型电力变压器线圈中波过程的数值分析

The Numerical Analysis of Impulse Voltage distribution in Large Power Transformer Windings

主要分析和计算在过电压情况下，大型电力变压器线圈中的冲击电压分布．利用求方程系数矩阵的广义特征值求解变压器线圈的等值电路，编制了一套多功能计算程序．并用实例做了验证，计算和测量结果吻合良好．分析了多线圈变压器，特别是自耦变压器、有载调压变压器线圈波过程的特点．以电感和电容组成的多线圈变压器等值网络是以一对线饼为单元，细分变压器的主要线圈而组成的，以便尽可能全面了解线圈内部的冲击电位及梯度电压分布．可以用低μ值铁芯导磁率计算变压器线圈等值网络的电感参数．线圈中组合绝缘材料的等值介电系数的计算和选择，是电容参数计算中的重要因素。

Analysis and computation of surge response in power transformer windings under over-voltage.The equations are solved by finding the generalijed eigenvalues of the coefficient matrices for large equivalent network and the multi-function computer program has been performed.The calculating results show good agreement with the experimental results.The distinguishing features of surge response in the multiwinding transformer,especially in the multiwinding autotransformer and transformer fitted with O.L.T.C.are described.The equivalent network of these multiwinding transformers is formed by the precis subdivision of the main windings of a transformer(e.g.taking a pair of disk coils as a unit),so that the voltage stresses in the windings can be obtained in more detail.This paper is shown that the inductances adopted in the equivalent circuit can be calculated with low value of the permeability of the leg when the iron core is taken into account.The accuraccy of capacitance calculation is more significant for the computation of the surge response.