Study on Electrical Life Test of Miniature Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2022.01.004

Abstract

Abstract:

An electrical life test device of miniature circuit breaker (MCB) is built,and the electrical life tests with MCB samples are carried out.Using the arcing voltage and arcing current signals collected in the test,the characteristic quantities that could reflect the degradation process of electrical life of MCB are extracted.In addition to the above works,an electrical life assessment model of MCB based on BP neural network is built,which used characteristic quantites as input parameters.The result of study shows that the extracted relative closing time and arcing voltage dropping time can greatly reflect degradation process of electrical life of MCB,and the electrical life assessment model has good assessment effect.

Key words: miniature circuit breaker (MCB), electrical lifespan, characteristic quantites, assessment model

CLC Number:

TM561

HE Zhipeng, ZHAO Hu. Study on Electrical Life Test of Miniature Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2022, 0(1): 19-26.

Figures/Tables 17

References 22

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参数	内容
静触头材料	AgC₄
动触头材料	铜锌合金
试验电压/V	AC 235
试验电流/A	16
负载类型	阻性
合分闸操作频率/(次·h^-1)	210
每次操作循环中触头处于断开位置的时间/s	10

触头烧蚀量x/mm	电寿命等级
x<0.35	Ⅰ
0.35≤x<0.7	Ⅱ
0.7≤x<1.05	Ⅲ
1.05≤x	Ⅳ

参数	数量
神经元数目/个	7	8	9	10	11
评估准确度/%	91.18	91.18	90.86	91.55	91.02