Abstract
The objective of this paper is to compare the electrical performance of CuCr30 (30%wt of Cr) contact material manufactured by vacuum arc-melting (VAR) and vacuum induction melting (VIM) technology. Experimental results show that the contacts manufactured by VAR having a better electrical performance than that of VIM. Firstly, the contacts manufactured by VAR have more homogeneous micro-structures than the contacts produced by VIM. Secondly, the electrical endurance performance of contacts manufactured by VAR shows better electrical endurance than that manufactured by VIM. Results of electrical endurance test, performed according to national standard GB/T 3855–2008, show that the contacts manufactured by VIM can withstand 38 interruptions of 25 kA short-circuit current at 12 kV voltage level. However, the contacts manufactured by VAR show 56 interruptions under the same test duty.
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