Erosion behaviour and 'erodibility' of Ag/CdO and Ag/SnO/sub 2/ contacts under AC 3 and AC 4 test conditions

Proceedings of the Thirty Fifth Meeting of the IEEE Holm Conference on Electrical Contacts Pub Date : 1989-09-18 DOI:10.1109/HOLM.1989.77905

H. Manhart, W. Rieder

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引用次数: 9

Abstract

Contact erosion depends on both the duration and efficiency of interaction between arc and contacts. The arc motion in a magnetic field was recorded, and the material loss caused by arc erosion was weighed. The material loss related to 1 ms of arc interaction, called erodibility, was evaluated for the contact materials Ag/CdO and Ag/SnO/sub 2/. All tests were performed in one type of commercial contactor (rated current 110 A). The erodibility was determined for new and partly eroded contacted prestressed during life tests under AC 3 and AC 4 conditions according to IEC test specification 158-1. AC 4 erosion was mainly caused by break arcs, but the effect of make arcs was negligible, whereas AC 3 erosion was due to both break and make arcs. The latter were more effective in Ag/SnO/sub 2/ contacts. After AC 3 life tests the erodibility values determining the erosion of Ag/SnO/sub 2/ contacts at the site of arc formation were higher than those of Ag/CdO; after AC 4 life tests, however, there was hardly any difference between the erodibilities of the two materials.<>

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ac3和ac4试验条件下Ag/CdO和Ag/SnO/ sub2 /触点的侵蚀行为和可蚀性

触点侵蚀取决于电弧与触点之间相互作用的持续时间和效率。记录了电弧在磁场中的运动，并对电弧侵蚀造成的材料损耗进行了称重。测定了接触材料Ag/CdO和Ag/SnO/sub / 2/在电弧作用1ms时的可蚀性。所有试验均在一种商用接触器(额定电流为110 A)中进行。在AC 3和AC 4条件下的寿命试验中，根据IEC试验规范158-1确定了新接触预应力和部分侵蚀接触预应力的可蚀性。ac4侵蚀主要是由断弧引起的，而形成弧的影响可以忽略不计，而ac3侵蚀是由断弧和形成弧共同引起的。后者在Ag/SnO/ sub2 /接触中更有效。AC - 3寿命试验表明，Ag/SnO/sub - 2/触头在电弧形成部位的侵蚀率高于Ag/CdO;然而，经过ac4寿命试验，两种材料的可蚀性几乎没有差别。

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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Proceedings of the Thirty Fifth Meeting of the IEEE Holm Conference on Electrical Contacts

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