基于地理信息的配网感应雷闪络风险评估

Risk Assessment on Introduced Lightning Flashover of Distribution Network Based on Geography Information

摘要:

感应雷过电压是10kV配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。

Abstract:

Induced lightning overvoltage is the main reason for the tripping and shutdownn of 10 kV distribution network. The electromagnetic transient simulation model of induced lightning overvoltage is established. The influences of lightning distance, lightning current amplitude and soil resistivity on the overvoltage amplitude are analyzed, and a simplified calculation method is proposed. According to the tower coordinates, soil resistivity and probability density of lightning current amplitude of transmission and distribution lines, the calculation model of lightning flashover probability of distribution network tower is established. The risk assessment model of induced lightning flashover is constructed combined with the lightning density.