基于串联电阻的特高压变压器空载直流偏磁计算

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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.

Key words： UHV transformer, DC-bias, field-circuit coupling, series resistance, voltage compensation

Received: 15 June 2016 Published: 02 May 2017

PACS:	TM41
	TM153

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	Wang Zezhong
	Tan Ruijuan
	Zang Ying
	Yang Xiaoxiao
	Zhou Xuntong

Cite this article:

Wang Zezhong,Tan Ruijuan,Zang Ying等. DC-Bias Calculation for UHV Transformer in No-Load by Series Resistance[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 129-137.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I8/129

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