Arc Behavior and Electrical Damage of Rolling Current-carrying Cu Pairs at Different Rotating Speeds

doi:10.3901/JME.2021.15.168

Abstract

Abstract: Using the FTM-CF100 rolling current-carrying friction tester, the effect of rotating speed on the friction performance and damage mechanism of pure copper rolling current-carrying contact pairs is investigated. The arc behaviors and the surface electric damage are emphasized. With the increase of rotating speed, the average current-carrying friction coefficient decreases gradually and is always higher than mechanical friction coefficient, and the real-time current is more prone to drastic fluctuations. At higher speed, the arc appears earlier, the arc rate and arc energy are higher. The unstable contact at high speed may provide discharge gaps, which is advantageous to arc generation. After the arc appearance, the surface damage mechanism changes from the dominant mechanical damage at low speed to the coexistence of mechanical damage and arc ablation. Arc discharge can lead to current fluctuation, serious oxidation and the increase of contact resistance.

Key words: rolling, current-carrying, rotation speed, arc

CLC Number:

TH117

LI Jiawei, ZHANG Yanyan, SONG Chenfei, SUN Yixiang, CHEN Tianhua, ZHANG Yongzhen. Arc Behavior and Electrical Damage of Rolling Current-carrying Cu Pairs at Different Rotating Speeds[J]. Journal of Mechanical Engineering, 2021, 57(15): 168-176.

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