Novel Self-adjusted Full-line Current Protection Strategy for Small Resistance Grounding Distribution Network  

作　　者：Yabing Yan Fei Ao Huilin Liu Biao Xu Jinbo Wu Hui Li Yong Li Sijia Hu 

机构地区：[1]State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410007,China [2]State Grid Hunan Electric Power Company Limited,Changsha 410004,China [3]College of Electrical and Information Engineering,Hunan University,Changsha 410082,China

出　　处：《Chinese Journal of Electrical Engineering》2024年第4期83-96,共14页中国电气工程学报(英文)

基　　金：Supported by the National Natural Science Foundation of China(U22B20106);the State Grid Power Company of Hunan Province Science and Technology Project(5216A5220022).

摘　　要：The existing current break protection cannot achieve full-line current protection and may lose its protection capability. Therefore, a self-adjusted full-line current protection strategy based on a double-layer criterion is proposed. The first layer of the criterion adopts the adaptive adjustment threshold as the setting value to realize full-line fault monitoring, which is not affected by the system operation mode and fault type. The second layer is used to locate the fault section of the line and improve the selectivity of the protection strategy. Considering the difficulty in accurately identifying high-resistance ground faults using current protection, an identification method based on compound power is proposed by analyzing the zero-sequence network of the system. Simulation results show that the proposed protection strategy can realize full-length line protection and the effective identification of high-resistance ground faults and is not affected by the system load variation and fault type.

关 键 词：Small resistance grounding distribution network current protection self-adjusted protection high resistance ground fault 

分 类 号：TM773[电气工程—电力系统及自动化]