考虑衰减时变压器短路电磁力的数值计算

Numerical Calculation of S-C Electromagnetic Forces of Power Transformer with Attenuation

变压器突然短路时线圈中短路电磁力的计算,已在文献[1]中进行了研究;本文在此基础上进一步考虑了时间衰减对短路电磁力的影响。结果表明,稳态短路时线圈中的电磁力仅有一个恒定分量和一个100Hz分量;一般情况下,最大短路电磁力约为稳态短路电磁力幅值的3.5—6倍,且作用在窗口内部线圈的辐向电磁力比窗口外部的略大;轴向电磁力则略小。

The radial and axial electromagnetic forces of power transformer under short circuit condition have been calculated in the reference [1]. In this paper, the influence of time attenuation and iron window is investigated. The results show that, there are only 100Hz and D.C force components on transformer coils in steady state, and the maximum S-C force is about 3.5—6 times of extent value in steady state. The radial forces on the coils inside windows are greater than the outside windows ones and the axial forces on the coils inside windows are smaller than the outside windows ones.