Statistical Analysis of Spatial and Temporal Distribution of Vegetation Fire Trip Accidents of EHV and UHV Transmission Lines of China Southern Power Grid

Disaster prevention and reduction of the power grid is an important guarantee for the power grid to withstand external disasters and ensure safe operation. Extra-high voltage(EHV) and ultra-high voltage(UHV) transmission line corridors usually traverse sparsely populated forest areas and span a long distance, so they are more susceptible to natural disasters such as vegetation fires. In this paper, 73 vegetation fire trip accidents of overhead transmission lines with the voltage level of 500kV, ± 500kV and ±800kV within the jurisdiction of China Southern Power Grid Co., Ltd.(CSG) from 2014 to 2022 are statists. Their temporal and spatial distribution pattern and influencing factors are analyzed. The results show that vegetation fire trip accidents mainly occur at 500kV, and the reclosing success rate is only 34.92%. The trip accidents mainly appear from February to April every year, and the period is mainly from 12:00 to 20:00. The risk of fire trip accidents is the highest in compound forest vegetation mainly contains pine trees. Meteorological parameters mainly have a great influence on the occurrence probability and spreading speed of fires. The conclusion of this study can provide a reference for reducing the vegetation fire trips of the power grid.