Influence of Contact Welding Process on Performance of Low Voltage Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2021.08.003

Abstract

Abstract:

As the core component of low voltage circuit breaker,electrical contact bears the role of connecting,loading and breaking current in the circuit,and its performance directly affects the service life and safety of related equipment.The ideal electrical contact should meet the requirements of high breaking capacity,strong arc resistance,good welding resistance and low temperature rise.This paper analyzes the important influence of contact welding process on the performance of low voltage circuit breaker based on the fixed mode of electric contact and the relevant tests in the design and certification process of low voltage circuit breaker.At the same time,some reasonable suggestions are put forward for the contact welding in the manufacturing process of low voltage circuit breaker.

Key words: electric contact, low voltage circuit breaker, fixing mode, welding process

CLC Number:

TM561

LI Ziqi, CHEN Yinbing. Influence of Contact Welding Process on Performance of Low Voltage Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2021, 0(8): 11-15.

材料名称	成分/%	材料性能
材料名称	成分/%	硬度HV	电导率/(MS·m^-1)	软化温度/℃
纯铜Cu-EPT	Cu≥99.9	50~90	56	150
镉铜CuCd1	Cd 0.7~1.3,Cu余量	90~95	43~45	250
铬铜CuCr1	Cr 0.3~1.2,Cu余量	85~140	43	475
铬锆铜CuCr1Zr	Cr 0.5~1.4,Zr 0.02~0.2,Cu余量	100~140	43	500
铍钴铜CuCo2Be	Co 2~2.8,Be 0.4~0.7,Cu余量	180~190	23	748
铜钨W75Cu	W 75,Cu余量	220	17	1 000
铜钨W78Cu	W 78,Cu余量	240	16	1 000
铜钨W70Cu	W 70,Cu余量	300	12	1 000
钨W	W 99.5	420	17	1 000
钼Mo	Mo 99.5	150	17	1 000
氧化铝铜Cu-0.38A1203	A1203(0.38),Cu余量	490	84	900
氧化铝铜Cu-0.94A1203	A1203(0.94),Cu余量	503	83	900

样品名称	金相图	异常组织成分
焊接后样品表面异常组织	图8	Cu、P、Ag
4.5 kA试验后动触点表面	图10	Cu、Ag、C
4.5 kA试验后静触点表面	图11	Ag、C
低短路电流分段试验后动触点表面	图12	Ag、Cu、C
低短路电流分断试验后静触点表面异常组织	图14	Cu、P、Ag

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Influence of Contact Welding Process on Performance of Low Voltage Circuit Breaker

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