摘要详情

ID / 提交时间

113 / 2024-04-12 21:23:12

标题

Study on the Fusing Characteristics of Parallel DC Fuses with Different Rated Currents

关键字

DC fuse,DC protection,Parallel fuses

主题及专题

7)Fundamental physics in Switchgear

状态

摘要录用

作者

Dongyu Wang / Xi'an Jiaotong University

Bin Xiang / 西安交通大学

Huixin Du / Xi'an Jiaotong University

Zhiyuan Liu / Xi’an Jiaotong University；State Key Laboratory of Electric Power Equipment

Yingsan Geng / Xi’an Jiaotong University；State Key Laboratory of Electric Power Equipment

Jianhua Wang / Xi'an Jiaotong University

摘要

DC fuses are widely used in the protection of photovoltaic module, electric vehicles, metal smelting and other DC transmission and distribution equipment, these devices take advantage of joule effect to break the fault current when it increases abnormally. However, it is difficult for DC fuses to break low fault current, because when the arc is generated, the instantaneous current density is low, lead to a low pressure in silica dioxide chamber, so the arc voltage is not high enough to extinguish arc. This paper’s research target is increase DC fuses arcing current density, at the same time ensuring the fuse’s rated current passing ability. A method of differentiated parallel DC fuses was proposed, two fuses with different rated current were connected in parallel, to make the low rated current fuse break low fault current eventually. The experimental circuit was built, the fuses whose rated current were 16A and 25A were paralleled together, in the low current fault(235A) situation, 11 group experiment shows all the 25A electric fuse were break firstly, then the paralleled 16A fuse interrupt the fault current; compare with the result from two 20A fuse in parallel, the differentiated parallel DC fuses can break a lower current than the same fuse in parallel, which may be benefit to enlarge fuse’s protection area. Three kinds of fuses’ I-t characteristic points position are discussed, and it is revealed that the arc sequence is due to the higher slope of I-t characteristic curve of fuses at low current, then different paralleled fuses’ characteristic points are moved, which are beneficial to increase the current density at the moment of arcing, shorten the pre-arcing time, and strengthen the breaking ability of low current faults.