直流偏磁对变压器励磁特性的影响

DC bias of transformer excitation characteristics of impact analysis

介绍了变压器直流偏磁的相关知识,阐述了直流偏磁对变压器的诸多影响,分析了直流偏磁的产生机理。其次利用PSCAD仿真软件建立了变压器模型,分析了不同直流偏磁下励磁电流各次谐波电流变化关系,对比了有无直流偏磁下的基波分量大小,有无偶次谐波和偶次谐波大小以及奇次谐波的大小。利用仿真实验手段分析了变压器直流偏磁时的励磁特性,验证了变压器直流偏磁理论的正确性。

This article first introduces the knowledge of transformer DC bias, the paper expounds the influence of DC bias of transformer, analyzes the mechanism of DC bias, derived the expression of the total magnetic flux under DC bias. Second transformer model was established using PSCAD simulation software, and made the following transformer simulation. Analyzed under different DC bias magnetic field current relation between every harmonic current, and mainly compares the presence of fundamental component size under DC bias, or accidentally harmonic and accidentally harmonic size and the size of the odd harmonics. This article USES the means of simulation experiment analyzed the excitation characteristics of transformer dc bias, verifies the correctness of the theory of transformer DC bias.