Abstract
In middle and low voltage distribution networks, single-phase grounding fault is most like to occur, so the mathematical model to accurately reflect the characteristics of grounding arc is the basis of network fault analysis. Based on arc-gap balance theory, this paper analyzes the characteristics of the classic Mayr model and Cassie model, establishes an arc model with reasonable combination of Mayr and Cassie, and further studies the influence of arc length parameters on arc characteristics, and reflects the physical characteristics of the grounding arc. Finally, the arc model is simulated in a 10 kV distribution network in the fault form of intermittent arc grounding. By comparing the results with the actual situation, the correctness of the arc model is verified, which lays a good foundation for the following fault analysis of distribution network.
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