Dependence of the Break arcs Driven by Transverse Magnetic Field on the Contact Opening Speed in a DC High-voltage Resistive Circuit

概要

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Break arcs are generated between pure silver electrical contacts in a DC high-voltage resistive circuit. The break arc is driven by the external transverse magnetic field of a permanent magnet. Electrical contacts are separated at constant opening speed at 25, 50, 75mm/s. The maximum supply voltage is 300V. The maximum circuit current when electrical contacts are closed is 20A. The maximum output power of the supply is limited to 6kW. The gap between the contacts and the magnet is defined as x. The gap x is 2.5mm. The magnetic flux density at the center of the magnet B_c is 121mT. The break arc is observed with a high-speed camera. The effect of the magnetic field on the arc duration is examined. The effect when the contacts opening speed is varied is examined. As a result, the arc duration shortened extremely by the transverse magnetic field using the permanent magnet. The arc duration decreased with increase of the opening speed. Just before lengthening of the break arcs between the contacts, in this experimental condition, the arc length is constant and the Lorentz force is proportional to the arc current.
社団法人電子情報通信学会の論文
2010-11-04