变压器线圈暂态的频域分析

Frequency domain analysis of the transient in the transformer winding

建立了变压器线圈频率依赖数字仿真模型。通过局部线圈等值电路与整体变压器线圈等值电路相结合，既可以计算整体变压器线圈的暂态电压分布，也可以计算局部线圈匝间电压分布。该模型还可以用于变压器在线条件下的暂态分析。实例计算与实测的结果吻合得很好。

A frequency dependent model for transient simulation in power transformer windings is described in this paper. The model consists of two parts: an equivalent circuit on turnbasis for a part-winding or a coil and an equivalent circuit on coil basis for transformer wind.ings as a whole in which the impedance of the circuit unit is calculated from the previous circuit on turn basis. The modified Fourier transform is used in the frequency analysis to overcome the aliasing problems caused by chopping a long-tail wave. This model can be used tosimulate part-winding resonance and very fast-front transient in transformer windings. Acomparison between the calculated and measured results shows that the model presented herehas sufficient accuracy for practical use.