Mechanism Analysis of Mountain Fire Caused by Arc Grounding Fault Discharge in Distribution Network in Forest and Pastoral Areas

The distribution network environment in forest and pastoral areas is complex and changeable, which is very easy to cause arc-like high resistance grounding fault, thus causing a large area of mountain forest fire accidents. However, arc-like grounding faults are mostly random, and it is difficult to describe their development process by traditional analysis methods. In view of this problem, this paper analyzes the process of arc grounding fault discharge causing mountain fire, establishes the arc high resistance grounding fault model considering the development characteristics of arc grounding fault, carries out the arc fault true type test of distribution network, and simulates the development process of arc fault in the distribution network of forest and pastoral areas by conducting the arc grounding fault test under the typical fault environment of forest and pastoral areas. Through the analysis of the experimental data, the influence of the change trend of the transition resistance on the electrical fire is analyzed. The test results show that the high resistance grounding fault of the distribution network in the forest and pastoral areas has a development process and is easy to cause electrical fire.