Effect of Shapes of Contact Surfaces on Break Arcs occurring between Electrical Contacts in which a Magnet is embedded

概要

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Break arcs are rotated with the radial magnetic field formed by a magnet embedded in the fixed contact. They are generated in a DC42V resistive circuit. The circuit current when the contacts are closed varies from 5A to 21A. The strength of a radial magnetic field for rotating break arcs is constant. The contact surface of the anode is changed. The arc duration and the dependence of the arc length and the positions of the break arcs on the contact surfaces are investigated to study the effects of the contact surface shape on the break arc. The following results are obtained. When the circuit current when the contacts are closed is smaller, arc duration becomes shorter as the radius of curvature becomes small. The effect of the difference of the anode shape to the arc duration becomes larger with decrease of the circuit current when the contacts are closed. The arc length when the rotational break arc is extinguished is not dependent on the shape of the contacts. When the circuit current when the contacts are closed is large, the anode spot region is located nearer to the center axis in time just before arc extinction for each contact shape.
一般社団法人電子情報通信学会の論文
2011-11-10