Arcing failure analysis of miniature circuit breaker using nano-W–Cu material

摘要

In order to solve the problem of frequent failures of miniature circuit breakers and the resulting short arcing,rnresearch on nano-tungsten–copper (nano-W–Cu) material in arcing failure analysis of miniature circuit breakers wasrncarried out by the authors. Ordinary pure copper material, which is widely used in electrical power distribution,rnexhibits major limitations such as low melting point and metal vapor, which causes frequent failure of the miniaturerncircuit breaker. In this way, on the basis of analyzing the mechanism of miniature circuit breaker arcing and usingrnnano-tungsten–copper material, this paper makes provisions for the 10 kA tolerance test process and conditions ofrnshort-circuit current and extracts the commonly used test for a certain type of miniature circuit breaker combinedrnwith nano-tungsten–copper material. The test results show that miniature circuit breaker arcing can be reduced byrnusing nano-tungsten–copper material to replace the ordinary pure copper alloy. This could significantly enhance thernperformance of miniature breaker arcing and its breaking capacity and reduce the miniature circuit breaker arc timernas well as the breaking time, which could effectively improve the reliability, security and stability of miniature circuitrnbreakers and effectively solve the problem of miniature circuit breaker arcing failure.