Abstract
AbstractAiming at the influence of operation characteristics of single-phase transformer and three-phase column transformer, the difference of magnetic circuit formed by DC bias, this paper takes 1 kV single-phase transformer and 1 kV three-phase column transformer as research objects. Firstly, the causes of DC bias are explained and the mechanism of DC bias is analyzed. Secondly, according to the magnetic circuit structure of single-phase transformer and three-phase transformer, the magnetic circuit is analyzed and the DC bias magnetic circuit is deduced. Finally, the quantitative DC bias is calculated by the formula, and the distribution of DC bias, magnetic density, distortion of excitation current and harmonic content are carried out. The DC bias tolerance of single-phase and three-phase transformers is verified from theoretical simulation analysis and real test, and the influence of bias current on excitation current, harmonic distortion rate and electromagnetic transient is comprehensively analyzed. It can provide a reference for solving the influence of transformer under DC bias condition, and has important research significance.KeywordsUnipolar earth circuitDC magnetic biasExcitation currentPower transformer
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