Silver electrical contacts are separated at a constant speed and break arcs are generated in a DC300V-450V/10A resistive circuit. The transverse magnetic field formed by a permanent magnet is applied to the break arcs. Alumina pipes are placed around the contacts to restrict the motion of break arcs. The dependences of the arc lengthening time and arc length just before arc extinction
L on the strength of the magnetic field and supply voltage are investigated. It was found that the arc lengthening time increases with increasing supply voltage
E and tends to decrease when the magnetic flux density
Bx is increased. The arc length just before arc extinction
L increases with increasing
E and decreasing
Bx. It also increases linearly with increasing arc lengthening time
tm when no reignitions occur.
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