Experimental Simulation of Bimetallic Strip Thermal Flexivity Specialty in Miniature Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2022.02.008

Abstract

Abstract:

This paper studied the thermal tripping bimetallic strip in miniature circuit breaker (MCB),analyzed the thermal flexivity specialty from aspects of theoretical calculation,experiment and digital simulation,respectively.A new method was proposed for bimetallic strip optimization design,and a platform was established to simulate the thermal flexivity of the bimetallic strips.A set of special fixture was developed and designed for bimetallic strip flexivity performance experiments,the experiment platform and the method were improved.Using numerical simulation instead of part of preliminary experiments,with DOE,the optimal solution of design parameters could be solved rapidly,therefore the investment and time cost were both saved.In addition,the simulation platform could also be used for the collaborative design of operating mechanism parameters,of which the verification objective is tripping force and tripping stroke.

Key words: miniature circuit breaker (MCB), bimetallic strip, specific thermal flexivity, finite element, experimental simulation

CLC Number:

TM561

PAN Qingyuan. Experimental Simulation of Bimetallic Strip Thermal Flexivity Specialty in Miniature Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2022, 0(2): 46-52.

Figures/Tables 18

References 14

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组元层材料	ρ/ (Ω·mm²/m)	F_b/ (× 10^-6·K^-1 )	E/GPa	组分层厚/mm			μ	E校验/ GPa		E误差/ %
组元层材料	ρ/ (Ω·mm²/m)	F_b/ (× 10^-6·K^-1 )	E/GPa	数值计算	约化		μ	E校验/ GPa		E误差/ %
FeNi20Mn6	0.790 0	19.0	202.0	0.434 712		0.44	0.30
Cu	0.017 5	17.0	114.0	0.140 505		0.14	0.33	169.643	2.813 7
FeNi36	0.830 0	0.8	154.9	0.424 783		0.42	0.30

时间序列	电流大小	通电时长/min
1	I_n	180
2	1.13I_n	60
3	1.45I_n	20
4	1.45I_n(1+5%)	10
5	1.45I_n(1+10%)	5
6	2.55I_n	1/6

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