10kV/2kA混合型限流熔断器用电弧触发器的分析与设计

电弧触发式混合型限流熔断器是电子测控式限流熔断器的一种更新装置,具有可靠性高、体积小、成本低等优点,但现有产品的最高额定电流只有600A,额定极限分断电流只有25kA。为此,对电弧触发式装置进行了分析,认为制约其额定电流和极限分断电流水平的关键因素是电弧触发器的动作快速性不够,提高动作快速性的有效方法是提高狭颈的载流密度。基于ANSYS 11.0软件对电弧触发器进行仿真分析和参数优化,获得了电弧触发器熔体的优化设计结构。实际制作的电弧触发器,其狭颈额定载流密度高达3 300A/mm2,可用于额定电压10kV、额定电流2kA、额定分断能力40kA的混合型限流熔断器。

Analysis and Design of Arc Trigger of 10kV/2kA Hybrid Current Limiting Fuse

Arc triggering hybrid current limiting fuse is an upgrading apparatus of the electronic measurement and control fuse for limiting current.Despite the advantages of high reliability,small volume,and low cost,the maximum rated current of this apparatus is only 600A,and the rated interrupting capability is only 25kA.Analysis of the arc triggering apparatus shows that the major limitation of the rated current and the rated interrupting capability is due to deficiency of operation rapidity.Increasing the carrying current density is an effective way to improve the operation rapidity.Consequently,simulation and parameters optimization of the arc trigger were conducted under ANSYS 11.0to attain the optimal fuse element structure.Fractured arc trigger in practical techniques which achieved a carrying current density up to 3 300A/mm2,could be utilized to rated 10kV,2kA,and 40kA interrupting capability hybrid current limiting fuse.