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《Power System Protection and Control》 2015-05
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Research on the relationship between initial contact resistance and lifetime in contact life tests

ZHANG Feifei;LI Zhigang;LI Lingling;WANG Jing;School of Electrical Engineering, Hebei University of Technology;Zhangjiakou Wind and Solar Power Energy Demonstration Station Co., Ltd.,State Grid Xinyuan Company;  
If it could be found that the relationship between early contact resistance of relay and lifetime, the lifetime of a single product would be obtained by the prediction of early contact resistance, instead of using the complete life tests. Meanwhile, this method could avoid the disadvantage of using the life of a batch of products to represent the life of a sample. So, the relationship between contact resistance values and lifetime in life tests are studied. Based on relays' classification by the size of lifetime, the varying characteristic of the early contact resistance are compared and analyzed among groups of relays. The analysis shows that the lifetime of relays is related to the values of initial contact resistance. The relay is prone to early failure, and has short lifetime, when there are several large values of contact resistance in the early period in operation of relay, even if the value of contact resistant go back to the normal range after operating for a while. When the values of contact resistance are normal in the beginning period, and have a trend of soaring increase in the middle and later period, the relay is about to fail. The remaining useful life at the maximum of contact resistance is related to the change of the contact resistance values.
【Fund】: 国家自然科学基金(51377044);; 高等学校博士学科点专项科研基金(20121317110008);; 河北省科技支撑计划资助项目(13214303D 13214604D)~~
【CateGory Index】: TM58
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