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| B-H Curve Based on Core and Asymmetric Magnetizing Current in DC-Biased Transformers |
| Guo Mansheng1 Mei Guihua2 Liu Dongsheng1 Liu Yancun2 Cheng Zhiguang1 Zhang Xile1 |
| 1. Baoding Tianwei Baobian Electric Co. Ltd. Baoding 071056 Chinab 2. Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510600 China |
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Abstract Based on the direct current biased magnetization properties for transformer core, an engineering-oriented practical method to calculate the asymmetric magnetizing current in DC biased large power transformer is presented in this paper.Firstly, the characteristic curves involved ?-I、B-H related to different DC biasing level are established by experiments on the transformer model, which reduced in scale to a linear dimentional ratio of approximately 1/50 relative to a 250MVA class transformer; Secondly, the effect on the curves due to biased magnetic flux are considered by simulation. Lastly, the method are developed to determine the asymmetric magnetizing current.The experiments are in accordance with the simulation results, confirming the validity of the proposed method.
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Received: 26 December 2007
Published: 14 February 2014
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2009, Vol. 24 
