Simulation and Analysis on the Force of Arc Contact of SF6 Circuit Breaker under Different Making Speed

Abstract

The making inrush current generated when the SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> circuit breaker is closed can cause serious erosion to the arc contact. During the making process of the SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> circuit breaker, the contact force generated by the movement of the moving arc contact against the static arc contact is the root cause of the wear of the arc contact. In order to study the influence of the making speed on the erosion of arc contacts, the force of the arc contact at different making speeds were simulated. The study found that the making speed has a significant effect on contact erosion. When the making speed is high, the impact force is large, but the arcing time is short. When the making speed is small, the impact force is small but the arcing time is long, so an optimal value of the making speed should have the least impact on the contact erosion. The research results in this paper have certain guiding significance for the analysis of the electrical life of contact making erosion.