The influence of switching arcs on contact resistance of Ag/SnO2 materials

2015 IEEE 61st Holm Conference on Electrical Contacts (Holm) Pub Date : 2015-10-01 DOI:10.1109/HOLM.2015.7355092

T. Mutzel, R. Niederreuther

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引用次数: 2

Abstract

Silver tin oxide (Ag/SnO2) contact materials are widely used for relays and contactor applications. Device approbation in accordance to standards requires several types of temperature rise test in new and switched conditions. Significant differences in temperature rise after the various switching sequences are experienced. In addition, differences between individual phases of one device - especially in switched condition - are known from test. In this work, the contact resistance evaluation under different load conditions has been studied. Therefore the arcing events at make and break operation during different endurance tests (AC-3 and AC-4) have been analyzed and correlated to the contact resistances at rated current level during temperature rise test. Surface layer changes of contact materials after load are characterized by metallurgical methods. The paper shows the formation of different surface layers as a function of arcing energies during make and break operation. The results demonstrate that make and break arc together are creating the surface layers defining the final contact resistance.

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开关电弧对Ag/SnO2材料接触电阻的影响

银锡氧化物(Ag/SnO2)触点材料广泛用于继电器和接触器。根据标准，设备批准需要在新的和切换的条件下进行几种类型的温升试验。不同开关顺序后的温升有显著差异。此外，从测试中可以知道一个器件的各个相位之间的差异，特别是在开关状态下。本文研究了不同负载条件下的接触电阻评估。因此，本文分析了不同耐磨性试验(AC-3和AC-4)中合断操作的电弧事件，并将其与温升试验中额定电流下的接触电阻进行了关联。用冶金方法对接触材料加载后的表层变化进行了表征。本文给出了在闭合和断开过程中不同表面层的形成与电弧能量的关系。结果表明，电弧的形成和断弧共同形成了决定最终接触电阻的表层。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2015 IEEE 61st Holm Conference on Electrical Contacts (Holm)

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