Optimization Design and Experimental Verification of Electromagnetic Repulsion Trip Mechanism of Medium Voltage DC Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2021.07.006

Abstract

Abstract:

In order to improve the current limiting level of the medium voltage DC circuit breaker and reduce the inherent operation time of the circuit breaker,an electromagnetic repulsion trip mechanism was designed to respond quickly to the fault short-circuit current.In this paper,the electromagnetic analysis software Ansoft Maxwell is used to simulate the dynamic characteristics of electromagnetic repulsion trip mechanism.By changing the radius and thickness of the repulsion disk and the air gap between repulsion disk and coil,the influence of various structural parameters on the performance of repulsion mechanism is obtained,which provides a basis for the design and optimization of electromagnetic repulsion trip mechanism.Finally,the motion characteristics of the mechanism are tested by experiments.The experimental results show that the dynamic characteristics of the electromagnetic repulsion trip mechanism are consistent with simulation results,and its performance index can meet the design requirements.This simulation method provides an effective way for the design and optimization of electromagnetic repulsion trip mechanism of medium voltage DC circuit breaker.

Key words: medium voltage DC circuit breaker, electromagnetic repulsion trip mechanism, dynamic characteristics, finite element analysis

CLC Number:

TM561

KONG Fanliang, XU Kai, MA Ziwen. Optimization Design and Experimental Verification of Electromagnetic Repulsion Trip Mechanism of Medium Voltage DC Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2021, 0(7): 34-39.

Figures/Tables 13

References 8

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参数	数值	参数	数值
斥力盘内径/mm	8	线圈盘内径/mm	17
斥力盘外径/mm	65	线圈盘外径/mm	65
斥力盘厚度/mm	8	线圈高度/mm	10
斥力盘材料	铝	线圈线径/mm	2
气隙/mm	1.2	线圈匝数/匝	52
负载质量/kg	3	电容容值/μF	10 000
运动距离/mm	5.8	电容预充电压/V	300