Abstract
When breaking low current, DC fuse is prone to voltage drop. It is caused by uneven arc burning between parallel necks. The problem of uneven arc burning in parallel slows down the breaking speed of the fuse, and in severe cases causes the fuse to overheat and arc spray. To solve this problem, this paper establishes a mathematical model of fuse arc, a commutation model between parallel necks and a pre-arc time model of necks. Based on Matlab, the current of each branch is calculated as well as temperature of necks. Then this paper explains the cause of uneven parallel arcing and analyzes the influence of the machining error and current on the phenomenon. Finally this paper calculates the minimum current density that fuse can arc evenly in parallel under different machining errors, and the conclusion can be used to guide the design of DC fuse.
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