10 kV配电网断线坠地故障地表电势分布及安全距离研究  

Study on Surface Potential Distribution and Safety Distance of Disconnected Grounding Fault in 10 kV Distribution Network

作　　者：丛子涵 刘亚东[1] 王鹏 方健 罗林根[1] 张行 江秀臣[1] CONG Zihan;LIU Yadong;WANG Peng;FANG Jian;LUO Lingen;ZHANG Hang;JIANG Xiuchen(School of Electronic Information and Electric Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Electric Power Research Institute,Henan Electric Power Company,Zhengzhou 450052;Guangzhou Power Supply Bureau Co.,Ltd.,Guangzhou 510620)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]国家电网河南省电力公司电力科学研究院,郑州450052 [3]广州供电局有限公司电力试验研究院,广州510620

出　　处：《高压电器》2022年第4期101-107,共7页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(51707117)。

摘　　要：研究配网线路断线坠地故障的地表电势分布,可为线路巡检,安全防护工作提供理论支撑。针对城市电网土地特点,构建了3层土壤模型,采用点电流源格林函数,分析了在干土地、湿土地、干混凝土地、湿混凝土地等不同工况下的地表电势分布,并通过现场试验验证了上述方法的正确性,最后结合工频电流对人体的威胁程度,划定了不同故障场景下的危险/安全距离。Studying the surface potential distribution of disconnected grounding fault of distribution network line can provide theoretical support for line inspection and safety protection work.In view of the characteristics of the ground of urban power grids,a three-layer soil model is constructed.The point current source Green’s function is used to analyze the surface potential distribution under such different working conditions as dry land,wet land,dry cement land and wet cement land.The correctness of the method mentioned above is verified by site test.Finally,the criteria for the danger/safe distance in different fault scenarios is defined in combination with the threat of power frequency current to the human body.

关 键 词：城市配电网 断线故障 地表电势分布 跨步电压 安全距离 

分 类 号：TM75[电气工程—电力系统及自动化]