Vacuum fault current limiter

Details Vacuum fault current limiter Vacuum fault current limiter

1975-01-20

1977-05-03

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200147R, H01H 3366

Patent

active

040216284

ABSTRACT:
A vacuum current limiting circuit interrupter having rapidly separable contacts and magnetic field coils disposed to produce a magnetic field transverse to the arc formed during circuit interruption. The transverse magnetic field creates arc instability and causes rapid arc extinction. The relatively movable contacts are disposed in an evacuated insulating envelope and are movable between a closed position completing an electrical circuit through the vacuum interrupter and an open position wherein the contacts are spaced relatively far apart with respect to the necessary voltage withstand level of the circuit interrupter. Magnetic field coils are supported to produce a magnetic field transverse to the arc plasma when the contacts approach maximum separation creating arc instability. An alternate current limiting path is provided in parallel with the vacuum interrupter through which reduced current flows until complete circuit interruption.

REFERENCES:
patent: 1906602 (1933-05-01), Hull
patent: 3147356 (1964-09-01), Luehring
patent: 3624324 (1971-11-01), Barkan et al.
patent: 3708638 (1973-01-01), Mitchell
patent: 3737819 (1973-06-01), Thuries et al.

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