Analysis and design of a new electromagnetic induction passive trigger
In view of the problem that the electronic trigger active power supply and the arc trigger in the hybrid current limiting fuse cannot be fully disconnected and heated,this paper presents a passive electromagnetic induction trigger scheme with full range breaking capability.This paper introduces its working principle,and focuses on the analysis and design of two functional modules:self-induced power supply and amplitude setting.The electromagnetic field and circuit are coupled by the finite element method,and the variation characteristics of magnetic induction intensity of iron core coil with position are studied.At the same time,in order to solve the problem of insufficient supply of induced voltage under low rise rate,a single Hall chip is proposed to judge the amplitude of short-circuit current to reduce power consumption.In order to improve the reliability of trigger,a delay control circuit is designed.Finally,the engineering prototype is designed according to the simulation parameters,and the minimum short-circuit current rise rate of the rated 4000 V/6000 A fuse is 8 A/μs and maximum short circuit rise rate 33 A/μs.The test is carried out under the current limiting requirement of 10 kA short-circuit judg-ment amplitude,and the test results verify the feasibility and effectiveness of the design scheme.
short circuitelectromagnetic inductiontriggerhall chipfault detection
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