Simulation Analysis of Current Zero Arc Characteristics in SF6 Circuit-breaker by Lattice Boltzmann Method

Abstract

Nowadays, The SF6 circuit breaker is an indispensable critical protective device in the UHV power transmission network. In order to study the arc characteristics more accurately, a nozzle arc model is established based on mesoscopic lattice Boltzmann method. Based on this model, the arc process of SF6 circuit breaker is simulated. This paper analyzes the temperature change in 50$\mu$s before and after zerocrossing current. The high-temperature particles mainly gather at the front end of the static contact, where the risk of thermal breakdown is greater. The distribution of temperature, density, and gas velocity on the arc core shows the cause of this hightemperature region.