Research and Experiment on Improving Current Carrying Capacity of AC Contactor

doi:10.16628/j.cnki.2095-8188.2024.01.010

Abstract

Abstract:

In order to meet the demand for miniaturization of electrical equipment and solve the problem of temperature rise exceeding the standard after the current carrying capacity of AC contactors was increased,a feasible approach to improve the current carrying capacity of contactors was selected by analyzing the main factors affecting the temperature rise and contact resistance of AC contactors.Taking a certain type of AC contactor as the object,the contact material,contact type,contact pressure,etc.were optimized.The feasibility of the optimization scheme was verified through the theoretical calculation,and the effectiveness of the scheme was finally verified through experiments.

Key words: AC contactor, current carrying capacity, contact resistance, contact temperature rise

CLC Number:

TM572.2

HE Wei, JI Hua, GONG Yelin. Research and Experiment on Improving Current Carrying Capacity of AC Contactor[J]. LOW VOLTAGE APPARATUS, 2024, 0(1): 56-59.

状态	触点材料	触点厚度/mm	触点接触面	是否有压纹
优化前	AgSnO₂(8)In₂O₃(4)	2.4	线接触	无
优化后	AgSnO₂(10)	1.8	平面接触	有

试品	主回路温升/K
试品	A相		B相		C相
1#试品	54.2	58.0	56.1	59.5	52.3	53.4
2#试品	52.7	49.0	54.9	55.0	51.4	50.1

试品	主回路温升/K
试品	A相		B相		C相
1#试品	72.0	73.1	80.9	82.0	71.5	70.3
2#试品	68.7	72.5	78.4	84.2	74.4	73.8

试品	主回路温升/K
试品	A相		B相		C相
3#试品	53.2	55.8	59.4	58.7	52.3	55.4
4#试品	51.8	52.5	55.7	54.6	52.8	53.3

试品	主回路温升/K
试品	A相		B相		C相
3#试品	61.5	59.8	64.3	62.1	59.7	57.5
4#试品	60.7	58.6	63.1	61.5	58.4	56.8

Research and Experiment on Improving Current Carrying Capacity of AC Contactor

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