Wildfire disasters have a high probability to cause line trippings

which leads to power outages and threatening the safe and stable operation of power system. In order to study the fault signal characteristics of 35 kV transmission line caused by the wildfire

a mountain fire fault simulation test platform for 35 kV transmission line under the wildfire condition is established

and the wildfire fault simulation test is carried out. The waveforms and phenomena of flame single phase wire test

flame phase-to-phase wire test

smoke single phase wire test

and smoke phase to phase wire test are measured and recorded. The research shows that smoke has little effect on the insulation of transmission lines

while flames have a greater impact on the insulation of transmission lines. The research results can provide a theoretical support for the study of measures to prevent mountain fire accidents.