DC-Bias Calculation for UHV Transformer in No-Load by Series Resistance
Wang Zezhong1, Tan Ruijuan1, Zang Ying2, Yang Xiaoxiao1, Zhou Xuntong2
1. Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China ; 2. Shandong Power Equipment Co. Ltd Jinan 250000 China
Abstract：The DC-biased characteristics of UHV transformer are solved based on the time-domain field-circuit coupled model. The accuracy of the DC component about the calculated current is improved by increasing the series resistance. According to the calculations of different series resistance, the range of series resistance is deserved. The series resistance changes the circuit configuration of UHV transformer, while the voltage compensation effectively eliminates the current calculation error arising from the series resistance. The transient current is solved by the fourth Runge-Kutta, where a slope calculation corresponds to an inductance calculation. Reducing the time step appropriate can improve the calculation accuracy of current DC component and reduce the series resistance. Based on the analysis of the stability and accuracy, the precise excitation current waveforms are obtained and harmonic components are analyzed through DC bias calculation for UHV transformer in no-load with different bias currents.
王泽忠, 谭瑞娟, 臧英, 杨箫箫, 周训通. 基于串联电阻的特高压变压器空载直流偏磁计算[J]. 电工技术学报, 2017, 32(8): 129-137.
Wang Zezhong, Tan Ruijuan, Zang Ying, Yang Xiaoxiao, Zhou Xuntong. DC-Bias Calculation for UHV Transformer in No-Load by Series Resistance. Transactions of China Electrotechnical Society, 2017, 32(8): 129-137.
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2017, Vol. 32 
