Magnetic extinction of arcs in switches

Details Magnetic extinction of arcs in switches Magnetic extinction of arcs in switches

1981-06-22

1983-12-20

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200147A, H01H 944, H01H 3318

Patent

active

044219636

ABSTRACT:
The arc formed during circuit-breaking is lengthened to extinction. In order to achieve this, the magnetic flux density, the arc current intensity, and the gas pressure, adjacent the cathodic spot 11, are chosen to be such that the cathodic spot 11 is displaced contrary to the Lorentz force. The necessary magnetic field is preferably provided by a magnet 6 whose stray magnetic field has flux lines which form an arched tunnel extending along the cathode 1.

REFERENCES:
patent: 577371 (1897-02-01), Patten
patent: 3376401 (1968-04-01), Bazi et al.
patent: 3953694 (1976-04-01), Bernard et al.
patent: 4160140 (1979-07-01), Rolff
patent: 4250364 (1981-02-01), Kimblin et al.
C. J. Gallagher, Journal of Applied Physics, "The Retrograde Motion of the rc Cathode Spot", Aug. 1950, vol. 21, pp. 768-771.
V. I. Alferov et al., Sov. Phys. Tech. Phys., "Retrograde Motion of the Current in a Discharge in a Transverse Magnetic Field", vol. 22, No. 1, Jan. 1977, pp. 57-62.
Eidinger et al., "Verhalten des Lichtbogens im Transversalen Magnetfeld" Archiv fur Electrotechnik, vol. 43, Section 2, 1957, pp. 94-114.

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