Adaptability Analysis of Phase-selector Based on Sudden-change of Phase-current-difference in Cross-voltage Fault Occurred in Mixed-voltage Transmission Lines
Liu Xin1,Huang Shaofeng1,Zhang Peng2
1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China 2.State Grid DC Project Construction Branch Company Beijing 100052 China
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.
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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2015, Vol. 30 
