Growth of Transferred Pip and Electrical Property on AgCdO Make-only Contacts in a Resistive Circuit with de 14V and 42V Power Supply

摘要

AgCdO12wt% contacts mounted on electrical relays were tested in a de 14V-21A and 42V-8.4A resistive circuit as make-only contacts. In this experience, we took photograph records and measured arc duration and number of bounces. The transferred pip has been grown on cathode surface, and its height H has grown "H/Gap>0.5", sticking have happened easily. Rapid of growth or shape of the transferred pip have not influenced circuit condition, but there is a difference from each sample. Since arc discharge of switching operations at make-only contacts occurs during a rebound, arc duration as well as number of bounce fluctuates.