避雷器被大量運用於電力系統雷擊防護，其特性對供電的品質及可靠性有很重要的影響。本論文探討避雷器裝設於架空配電線路遭雷擊之響應，做為相關保護措施參考。本論文採用ATP(暫態模擬軟體)，建立架空配電線路模型，模擬分析不同雷擊位置、避雷器裝置間距及避雷器接地電阻對雷擊響應，最後利用台電配電系統(台南小北變電所轄區)進行實務模擬，得知避雷器間距及接地電阻越大，防護效果越差。 The arresters are widely used for power system against lightning stroke. The performance will affect the power quality and stability. In this thesis, the arrester's response installed on overhead distribution system for lightning stroke are analyzed. The ATP software is employed for construct the distribution system model. The simulations include different stroke position、arresters installation span and ground resistance. The distribution system of Tainan area is adopted for practical simulations,arresters installation span and ground resistance that the greater,protective effect is worse.