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Failure analysis of CuWCuCrZr contact materials in capacitor bank switch.pdf

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Failure analysis of CuWCuCrZr contact materials in capacitor bank switch.pdf

Engineering Failure Analysis 62 (2016) 156–163 Contents lists available at ScienceDirect Engineering Failure Analysis journal homepage: /locate/engfailanal Failure analysis of CuW/CuCrZr contact materials in capacitor bank switch Qiao Zhang a,b, Shuhua Liang a,b,?, Xiaohong Yang a,b, Zhibing Li c, Yuchun Li c, Youpeng Zhang d a School of Materials Science and Engineering, Xian University of Technology, Xian 710048, China b Shaanxi Province Key Laboratory of Electrical Materials and In?ltration Technology, Xian University of Technology, Xian 710048, China c Electric Power Research Institute, Beijing 100192, China d Henan Pinggao Electric Co., Ltd., Pingdingshan 467001, China article info Article history: Received 18 August 2015 Received in revised form 21 December 2015 Accepted 19 January 2016 Available online 21 January 2016 Keywords: Arc contact Failure analysis Arc erosion Mechanical wear abstract The type test of CuW/CuCrZr arc contact used for ultra-high voltage system capacitor bank switch was conducted. Through the comparative analysis of morphologies, compositions, properties and microstructures of the contact materials before and after failure, it can be found that the abnormal open of moving arc contact and the arc erosion and mechanical wear of static arc contact are the major reasons affecting the arc contact failure. The failure mechanism and main affecting factors were investigated in detail. The results showed that arc erosion and mechanical wear are the two main factors that affect the service lifetime of arc contacts used for ultrahigh voltage transmission lines and cannot be ignored. Therefore, improving the arc erosion resistance and mechanical wear resistance simultaneously is the key to prepare the arc contact materials with longer lifetime. ? 2016 Elsevier Ltd. All rights reserved. 1. Introduction With the rapid development of the ultra-high voltage transmission lines used for national power grid construction, the higher performance requirements