时变非线性涡流场的一种分析方法

An approach to analyse the time dependent nonlinear eddy current field

变压器在过激磁情况下运行,由于磁场高度饱和及非线性,使磁场和电流的计算十分复杂,而且在激励源是电压源时,传统的解法不能适用。本文考虑到电压激励源作用,应用场、路结合来计算磁场和电流的时空分布,以时间周期性作为约束条件,进行有限元数值求解,新方法对单相变压器空载运行时的磁场和电流的计算结果,与实验测得电流大小和波形作了对比,证明比传统的有限元法具有减少运行计算时间和提高计算精度等显著优点。

Since the field is nonlinear and the exciting source is external voltage,the problem of ansly-sis and calculation of magnetic field and current in the transformers under overexciting condition are very complicated. This paper presents a new method which applies the combined F. E. M. and circuit equation to calculate the magnectic flux and current distribution under the voltage excitation and takes the periodic time of magnetic characteristic as the restrained condition, the assumption of initial value is disappeared. Through the calculation of field and current in the windings of a single phase transformer operating under no-load, this method demonstrates some eminent advantages on the less conputing time,the higher accuracy than those of the conventional methods.