Transverse Differential Protection for Quadruple-Circuit Lines with Asymmetrical Parameters
Liu Qi1, Tai Nengling1, Fan Chunju1, Yu Zhongan2, Shang Jin1
1. School of Electronic Information and Electrical Engineering Shanghai Jiaotong UniversityShanghai 200240 China; 2. School of Electrical Engineering and Automation Jiangxi University of Science and Technology Ganzhou 341000 China
Abstract：Due to the asymmetrical parameters of the quadruple-circuit lines, a new method for transverse differential protection and line selection is proposed. Fault super-imposed networks of the quadruple-circuit lines are discussed, and sequence currents of each line are also calculated during a fault. According to the characteristics of sequence currents obtained by the protector, negative- component based transverse differential protection approach is proposed. Different connection schemes of transverse differential protection are considered, and the setting values of the protection are calculated corresponding to different schemes. All the signals of all the protections are acquired by line selection to judge which line to be cut off. Simulation results have verified the reliability and feasibility of the negative-component based transverse differential protection.
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2016, Vol. 31 
