基于瞬态场路耦合模型的变压器直流偏磁计算

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Abstract The DC-biased problem of single-phase transformer is solved based on the transient field-circuit coupled model. Different patterns of DC injection,as DC current flowing through the primary winding or the secondary winding,are considered and compared. Result shows that the AC currents of the two injecting ways are nearly the same. On this basis,DC bias in no-load or load running is simulated by computing the excitations and dynamic parameters. The impacts of DC current on AC magnetic field and equivalent circuit parameters are analyzed. The exciting current is distorted wave,and its peak value and harmonic components increase when DC current grows. The dynamic inductance is asymmetric,which depends on the saturation. Consequently,the coupling parameters of different running modes have the similar varying regularity. In load operation,the dynamic leakage inductance perform as distorted waveforms under DC biasing,and leakage flux from the primary winding increases. As DC current exceeds certain value,the peak value of exciting current is approximately linear with DC current. Tests are carried out to prove the transient field-circuit method,which will be a new way for practical DC-biased transformers.

Key words： DC-biased transformer transient field-circuit coupling injecting way dynamic inductance

Received: 29 November 2011 Published: 11 December 2013

PACS:	TM74
	TM41

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	Pan Chao
	Wang Zezhong
	Li Hailong
	Liu Lianguang
	Zhang ke
	Guo ruoyin

Cite this article:

Pan Chao,Wang Zezhong,Li Hailong等. DC-Bias Calculation for Single Phase Transformers Based on Transient Field-Circuit Coupled Model[J]. Transactions of China Electrotechnical Society, 2013, 28(5): 174-181.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I5/174

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