相电流差突变量选相在混压同塔输电线跨电压故障中的适应性分析

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Abstract Cross-voltage fault is prone to occur in the mixed-voltage multi-circuit transmission lines system.As to the direction pilot protection and distance pilot protection,phase-selector is important.Taken the single phase to single phase cross-voltage earthed fault in transmission lines with strong-magnetic and weak-electric condition as an example,a composite sequence method that could decoupled the mixed-voltage transmission completely is proposed in this paper.The difference of the sudden-change of phase-current-difference between the proposed phase-selectors and the practically used simplified method is analyzed.Then the relationship between the adaptability of the phase-selector and the electromotive force phase difference of two sources is analyzed.The result shows that the adaptability is depend on the range of the electromotive force phase difference.The ranges of the phase differences for different situations are calculated.Finally,the theoretical analysis is tested in a 500 kV/220 kV four-circuit transmission line model built in PSCAD.

Key words： Cross-voltage fault single phase to single phase earthed fault mixed-voltage four-circuit transmission lines sequence-network phase-selector sudden-change of phase-current-difference

Received: 28 April 2015 Published: 12 November 2015

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TM315

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	Liu Xin
	Huang Shaofeng
	Zhang Peng

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Liu Xin,Huang Shaofeng,Zhang Peng. Adaptability Analysis of Phase-selector Based on Sudden-change of Phase-current-difference in Cross-voltage Fault Occurred in Mixed-voltage Transmission Lines[J]. Transactions of China Electrotechnical Society, 2015, 30(21): 118-126.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I21/118

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