Study on Vibration of Contact Mechanism of Double Breakpoint Moulded Case Circuit Breaker in Limit Breaking Capacity Test

doi:10.16628/j.cnki.2095-8188.2022.01.006

Abstract

Abstract:

In order to solve the problem that the moving and static contacts vibrate due to high-strength impact load or alternating load during the closing process of double breakpoint moulded case circuit breaker,a contact mechanism of circuit breaker is proposed.The test results show that the new circuit breaker contact mechanism increases the limit short-circuit breaking capacity from 100 kA to 150 kA,greatly reduces the arcing time and on-off time,and effectively improves the contact bounce problem.

Key words: contact mechanism, contact vibration, limit short-circuit breaking capacity, arcing time, on-off time

CLC Number:

TM561

ZENG Yi, CHEN Luming, WU Jiansheng, LI Jidan, OUYANG Haijun, TONG Wei. Study on Vibration of Contact Mechanism of Double Breakpoint Moulded Case Circuit Breaker in Limit Breaking Capacity Test[J]. LOW VOLTAGE APPARATUS, 2022, 0(1): 31-34.

序号	材料	成型方法	断裂时压力值/N
1	SMC	挤注	3 200
2	DMC	压制	3 800
3	SMC	压制	4 100

材料类别	材料牌号	耐温	韧性	弹性
碳素弹簧钢丝	65、70、75、85	低	低	高
琴钢丝	T8、T8A、T9、T9A	低	高	高
弹簧用不锈钢丝	1Cr18Ni9	高	高	低

项目	分断能力/kA	通断时间 T_mb/ms	燃弧时间 T_are/ms
改进前	100 (AC 400 V)	7.78	6.53
改进后	150 (AC 400 V)	1.15	1.16

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Study on Vibration of Contact Mechanism of Double Breakpoint Moulded Case Circuit Breaker in Limit Breaking Capacity Test

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