基于虚拟等效电感的特高压调压变压器励磁涌流判别算法

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Abstract Aiming at a typical mal-operation case of the differential protection of the ultra-high voltage (UHV) voltage-regulating transformer (VRT) in the 1 000 kV UHV experimental demonstration project, this paper analyzes the limitations of the 2nd harmonics with split-phrase lockout criterion on the spot for discriminating the VRT inrush. On the other hand, the terminal voltage of the VRT is unable to be measured, which limits the application of the equivalent instantaneous inductance. This paper suggests a method to obtain the terminal voltage of the VRT according to the structure of the UHV transformer. Meanwhile, it puts forward a discriminating algorithm for identifying inrush based on the distribution characteristics of the virtual equivalent inductance. By simulation, the 2nd harmonics with split-phrase lockout criterion and the waveform symmetry restraint principle are found to be inadequate for the VRT’s differential protection. Meanwhile, the proposed algorithm based on the virtual equivalent inductance has clear discriminating property. So it can distinguish inrush and a slight turn-to-turn fault reliably, which solves the miss-operation and mal-operation problems of the traditional methods in the VRT differential protection.

Key words： UHV voltage-regulating transformer inrush virtual equivalent inductance (VEI) 2nd harmonics waveform symmetry

Received: 24 March 2015 Published: 20 April 2016

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TM406

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	Zheng Tao
	Lu Geye
	Zhao Yanjie
	Chen Shuiyao

Cite this article:

Zheng Tao,Lu Geye,Zhao Yanjie等. A Discriminating Algorithm for Identifying Inrush of UHV Voltage-Regulating Transformer Based on Virtual Equivalent Inductance[J]. Transactions of China Electrotechnical Society, 2016, 31(7): 118-125.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I7/118

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