摘要详情

ID / 提交时间

117 / 2024-04-13 15:42:41

标题

The Effect of Fault Current on the Post Arc Dielectric Recovery of 500V Low Voltage AC Fuses

关键字

Fuse,post arc,dielectric recovery

主题及专题

7)Fundamental physics in Switchgear

状态

全文录用

作者

Huixin Du / Xi'an Jiaotong University

彬项 / 西安交通大学

东宇王 / 西安交通大学

Shuxing Ma / Xi'an Jiaotong University

Zhiyuan Liu / Xi’an Jiaotong University

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

Jianhua Wang / Xi'an Jiaotong University

摘要

When a fuse interrupt the fault current, the ability of the fuse to withstand the TRV without dielectric breakdown after current zero determines whether the interruption is successful or not. At present, there is relatively little research on the post arc process of fuses, and the specific process of the post arc dielectric recovery of fuses is not clear. In this paper, the post arc dielectric recovery process of fuses with a rated voltage of 500VAC is experimentally investigated. The dielectric recovery is measured by applying 1500V DC voltage pulse to the fuse after current zero. The dielectric recovery process of fuses under both overload and short circuit conditions is studied. It is found that when the fault current is 8 times the rated current, the dielectric recovery speed of the fuse is much slower than that of 35 times the rated current. Meanwhile, the experimental result has significant dispersity when the fault current is 8 times the rated current. Based on the analysis of experimental data and the observation of fulgurate, it is found that the reason for the dispersion of the dielectric recovery strength of the fuse under overload current is the uneven arcing of the series-parallel narrow sections. The post arc dielectric recovery strength of the fuse at 100us was analyzed, and the results showed that the arc voltage and arcing time of the fuse were linearly related to the dielectric recovery strength. The shorter arc time and the larger arc voltage lead to the higher dielectric recovery strength.