Contact Resistance Distribution on Anode Surfaces Eroded by Break Arcs in a DC48V Resistive Circuit

摘要

Break arcs are generated in a DC48V resistive circuit. The circuit current is varied from 1 A to 6 A. The contact resistance distribution on the anode surfaces eroded by break arcs is investigated. The following results are shown. When the current is 2 A, 3 A and 6 A, the contact resistance at the center region of the anode surface is higher than that around the center region. The contact resistance around the center region decreases with the decrease of the circuit current. When the current is 1 A, the contact resistance is very low at all positions on the contact surface. The lower contact resistance may be caused by the occurrence of the short arc that is extinguished in the metallic phase arc.