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| Accuracy Analysis for DC-Biased UHV Transformer in No-Load |
| Tan Ruijuan1, Wang Zezhong1, Deng Tao1, Xu Jianwen2, Li Shulian2 |
1. Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China;
2. Shandong Power Equipment Co. Ltd Jinan 250000 China |
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Abstract Due to the problem about DC-biased computation on UHV transformer, a new segmented analytical method for simplified circuit model of no load has been proposed. It lays the foundation for the numerical calculation. According to the simplified circuit model of no load, analytical formula is derived. With the change of the current, inductance is in two stages. The inductance value is determined by comparing the calculated current value with the critical current value. A critical current error criterion is set to determine whether the calculated current value reaches the critical current. The calculated result shows that the accurate solution of dc component can be obtained under a low resistance and a small error criterion. Instead, with a larger error criterion, the values of dc component vary greatly with accurate solutions, even exist wrong solutions. Finally, based on the above analytical solutions, the numerical solutions of the fourth Runge-Kutta are analyzed. The results show that it is necessary to increase the resistance when the time step is large, corresponding to a large error criterion; while the resistance may not be too much with a smaller time step, corresponding to a smaller error criterion. An accurate numerical solution can be obtained with an appropriate time step and an artificially increased resistance in the calculation of UHV DC bias transformer.
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Received: 22 February 2016
Published: 01 March 2017
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2017, Vol. 32 
