Protection Principle of Single-Phase High Resistance Fault for Distribution Network Based on Zero-Sequence Power Variation
Long Yi1, Ouyang Jinxin1, Xiong Xiaofu1, Ma Getu1, Yang Mingbo2
1. State Key Laboratory of Power Transmission Equipment & System Security and New TechnologyChongqing University Chongqing 400030 China; 2. Guizhou Power Grid Co. Ltd Guiyang Power Supply Bureau Guiyang 550004 China
Abstract：Since the single-phase high resistance fault is difficult to be effectively removed from the low-resistance grounding system, which has a large potential safety hazard. A single-phase high resistance fault protection method based on zero-sequence power variation is proposed in this paper. Firstly, the zero-sequence current distribution characteristic in the normal operation and single-phase high resistance fault are analyzed theoretically. On this basis, the zero-sequence power of the feeder is constructed as the characteristic of the single-phase fault identification of the distribution network. Then, utilizing the characteristic that the zero-sequence power variation of the non-fault feeder is small while the zero-sequence power variation of the fault feeder reflects the active power of transition resistance, the principle of single-phase fault protection based on zero-sequence power variation for the distribution network and its setting method are proposed. Theoretical and simulation analysis shows that the protection principle can accurately reflect the higher transition resistance with only single terminal information, and is less affected by the line-to-ground parameters and capacitance current, and has higher reliability and adaptability.
龙毅, 欧阳金鑫, 熊小伏, 马格土, 杨明波. 基于零序功率变化量的配电网单相高阻接地保护[J]. 电工技术学报, 2019, 34(17): 3687-3695.
Long Yi, Ouyang Jinxin, Xiong Xiaofu, Ma Getu, Yang Mingbo. Protection Principle of Single-Phase High Resistance Fault for Distribution Network Based on Zero-Sequence Power Variation. Transactions of China Electrotechnical Society, 2019, 34(17): 3687-3695.
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2019, Vol. 34 
