近年来受极端天气影响，山火事件频发，导致南方电网山火跳闸事件显著增多。为探究输电线路山火跳闸的主要影响因素及其作用规律，收集了近5年南方电网地区输电走廊的山火告警与跳闸事件数据，结合气候、地形及地表植被等因素，从时间与空间两个维度开展统计分析。同时，提出“输电线路山火跳闸敏感度”概念，用于表示单位山火告警次数下的山火跳闸概率，有效规避了统计分析中“相关即因果”的逻辑谬误。最后，结合火焰蔓延模型与空气击穿模型，深入剖析了环境因素影响规律背后的物理机制。结果表明：尽管南方电网的山火告警与跳闸事件逐年增加，但得益于电网山火监控手段的多元化及灭火措施的及时性，山火跳闸敏感度总体呈逐年下降趋势。该研究结论将有助于电网运维人员针对现场环境制定更具针对性与差异化的山火治理策略。

In recent years, affected by extreme weather, frequent wildfires have led to a significant increase in wildfire tripping incidents in the Southern Power Grid. To investigate the main influencing factors and their mechanisms behind wildfire tripping of transmission lines, data on wildfire warnings and tripping incidents along transmission corridors in Southern Power Grid region over the past five years are collected. Statistical analysis is conducted from both temporal and spatial dimensions, incorporating factors such as climate, terrain, and surface vegetation. Additionally, the concept of "transmission line wildfire tripping sensitivity" is proposed to represent the probability of wildfire-induced tripping per unit of wildfire warnings, effectively avoiding the logical fallacy of "correlation implies causation" in statistical analysis. Finally, by integrating flame spread models and air breakdown models, the underlying physical mechanisms of environmental factor influences are thoroughly analyzed. The results indicate that although wildfire warnings and tripping incidents in Southern Power Grid have increased year by year, thanks to diversified wildfire monitoring methods and timely firefighting measures, the overall wildfire tripping sensitivity has shown a declining trend annually. The findings of this study will assist grid operators in developing more targeted and differentiated wildfire management strategies based on field conditions.