Magnetic Blow-out of Break Arcs Occurring between Silver Electrical Contacts with Copper Runners

摘要

Arc runners are fixed on silver electrical contacts. Break arcs are generated between the contacts in a 450VDC circuit. Circuit current when contacts are closed is 10A. Supply voltage is changed from 200V to 450V. The following results are shown. With the runners, the cathode and anode spots stay between the contact and the runner after arc dwell time. After that, the cathode spots remain between the cathode and the runner but the anode spots run on the runner. Several reignitions occur for each break arc when the supply voltage is 300V and over. Arc duration of break arcs with runners is longer than that without runners.