摘要
感应雷过电压是10 kV配电网跳闸和停运的主要原因。为评估其风险,首先,建立了感应雷过电压的电磁暂态仿真模型,分析了雷击距离、雷电流幅值、土壤电阻率对过电压幅值的影响,据此提出了一种感应雷过电压幅值简化计算方法;然后,根据输配电线路杆塔坐标、土壤电阻率和雷电流幅值概率密度,建立配电网杆塔闪络概率计算模型;最后,结合地闪密度构建感应雷闪络风险评估模型。
Induced lightning overvoltage is the main reason for the tripping and shutdownn of 10 kV distribution network.Inorder to assess the risk,the electromagnetic transient simulation model of induced lightning overvoltage is established firstly.The influences of lightning distance,lightning current amplitude and soil resistivity on the overvoltage amplitude are analyzed,and a simplified calculation method for induced lightning overvoltage amplitude is proposed.And then,according to the tower coordinates,soil resistivity and probability density of lightning current amplitude of transmission and distribution lines,the calculation model for lightning flashover probability of distribution network tower is established.Finally,the risk assessment model of induced lightning flashover is constructed combined with the lightning density.
作者
雷潇
陈梦军
刘小江
廖文龙
刘强
Lei Xiao;Chen Mengjun;Liu Xiaojiang;Liao Wenlong;Liu Qiang(State Grid Sichuan Electric Power Research Institute, Chengdu 610041, Sichuan, China;State Grid Zigong Electric Power Supply Company, Zigong 613000, Sichuan, China)
出处
《四川电力技术》
2021年第1期1-4,76,共5页
Sichuan Electric Power Technology
基金
国网总部项目5500-202037100A-0-0-00(川藏高海拔地区电网雷电基础参数综合分析与工程化应用研究)。
关键词
地理信息
配电网
感应雷过电压
风险评估
geography information
distribution network
induced lightning overvoltage
risk assessment
