基于瞬态场路耦合模型的变压器直流偏磁计算

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摘要利用变压器瞬态场路耦合模型,计算单相变压器的直流偏磁问题。对比在一次侧和二次侧注入直流时变压器的直流偏磁情况,结果说明两种注入方式下交流电流的波形基本相同。分析变压器直流偏磁时交流磁场和电路等效参数的变化,变压器直流偏磁时励磁电流波形畸变,其峰值与各次谐波含量均随直流电流增大而增加；动态电感取决于励磁的饱和程度,其波形在交流励磁的正负半周并不对称,两种运行方式下场路耦合参数受直流影响的变化规律相同。负载运行直流偏磁时动态漏电感波形畸变,外侧一次绕组的漏磁通增大。当直流电流超过一定值时,变压器发生偏磁时的励磁电流峰值与直流电流近似呈线性关系。最后,通过实验验证了瞬态场路耦合方法的准确性和可行性,为变压器直流偏磁计算提供新方法。

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	潘超
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	郭若颖

关键词 ：变压器直流偏磁, 瞬态场路耦合, 注入方式, 动态电感

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

收稿日期: 2011-11-29 出版日期: 2013-12-11

PACS:	TM74
	TM41

引用本文:

潘超，王泽忠，李海龙，刘连光，张科，郭若颖. 基于瞬态场路耦合模型的变压器直流偏磁计算[J]. 电工技术学报, 2013, 28(5): 174-181. Pan Chao,Wang Zezhong,Li Hailong,Liu Lianguang,Zhang ke,Guo ruoyin. DC-Bias Calculation for Single Phase Transformers Based on Transient Field-Circuit Coupled Model. Transactions of China Electrotechnical Society, 2013, 28(5): 174-181.

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

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