直流偏磁对三相电力变压器的影响

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Abstract In order to look into the influence on the operation performance of a power transformer caused by the direct current (DC) bias, an improved electric and magnetic circuit coupled model is used. The eddy current effects of the core material are taken into consideration. The characteristics of exciting currents, leakage magnetic flux, secondary-side induced voltage, and the level of DC flux in limb are investigated for transformers with different core types and coil connections. The definition of transformer DC bias ratio is presented in the paper, with the aim of assessing the DC bias endurance in an unifed condition. The results indicate that the increasement of the DC bias ratio lead to distortion of the exciting currents waveform, increased harmonic currents and leakage magnetic flux from the coil. Meanwhile, the secondary-side induced voltage remains the same as in normal condition. In all transformer products, the three-phase three-limb transformer has the lowest level of sensitivity to the DC bias, but the single-phase three-limb tranformer bank with YN, yn connected coils has the highest level. The existence of the delta-connected coil has a positive meaning on improving the transformer endurance to the DC bias.

Key words： Transformer DC bias magnetic circuit exciting current leakage magnetic flux

Received: 09 October 2009 Published: 04 March 2014

PACS:	TM14
	TM41

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	Articles by authors
	Li Hongzhi
	Cui Xiang
	Liu Dongsheng
	Lu Tiebing
	Cheng Zhiguang

Cite this article:

Li Hongzhi,Cui Xiang,Liu Dongsheng等. Influence on Three-Phase Power Transformer by DC Bias Excitation[J]. Transactions of China Electrotechnical Society, 2010, 25(5): 88-97.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I5/88

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