Influences of High Temperature and Solid Particles on Streamer Discharge in Tree-line Faults

The occurrence of wildfires and line tripping caused by tree-line faults has emerged as a critical issue in power grids. To investigate the mechanism of streamer discharge under wildfires and provide theoretical support for realistic simulation of tree-line faults, a two-dimensional axisymmetric streamer discharge fluid model has been established. The microscopic quantities that cannot be measured experimentally such as densities of electrons and positive/negative ions, electric field spatial distribution during discharge process are calculated. The reliability of the model is verified by comparison with the existing research results. The calculation results show that with the increase of temperature, the electric field required for the streamer discharge is reduced, and the streamer radius and velocity are increased. The polarization electric field generated around the solid particles is larger than the maximum electric field of the original streamer. The combined effects of high temperature and solid particles greatly promote the development of streamer discharge, further increasing the streamer velocity.