关键词: 投影；光线延长线；短路；起火部位

Abstract: In a typical electrical fire accident investigation process, the investigators used the "Fire Inspection" video analysis software to analyze the key information in the video, determined the investigation direction of the electrical fire based on the arc characteristics, and used the fire video quantitative data method to calculate the fire video. The projection angle of the arc light, using the reverse extension line of the light projection to delimit the arc generation range. Through the experiment of light and shadow contour lines at different locations on the scene, the scope of investigation was narrowed as much as possible, and the conclusions of fire video analysis were verified by combining trace material evidence and witness testimony, so as to accurately determine the time, cause and location of the fire. Finally, the fire video analysis method, field experiment application, investigation and evidence collection measures are summarized and summarized.

Key words: forest fire; fire extinguishing technology; fire extinguishing agent; fire extinguishing bomb; fire extinguishing equipment