基于磁化曲线的分段式变压器励磁电感等效方法研究

Research of Segmentary Transformer Excitation Inductance Equivalent Method Based on Magnetizing Curve

提出一种基于磁化曲线的分段式变压器励磁电感的等效方法。分析了传统线性化基本磁化曲线中变压器励磁电感等效为线性定值的弊端;采用分段表达式方法,根据每段不同特点设置不同的数学表达式,找到励磁电感随时间的变化关系。仿真结果表明,该法准确地描述了变压器饱和时励磁电感的变化情况,为变压器励磁涌流识别及差动保护原理的拓展提供了参考。

This paper proposed a segmentary transformer excitation inductance equivalent method based on the magnetization curves. Analysiswas made to the disadvantages that the transformer excitation inductance was equivalent to the fixed linear constant value in the traditionallinear basic magnetization curves. According to the characteristics of each different mathematical expression, with the segmentary expressionmethod, this paper revealed the relationship between excitation inductance and the time. The simulation results show that this method coulddescribe the transformer magnetization curves accurately, to provide references for the transformer excitation surge current and the differentialprotection principle expansion.