Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1979-11-20
1981-11-17
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200146R, 200148R, H01H 3318
Patent
active
043013406
ABSTRACT:
A pair of switches are disposed adjacent one another in a housing which contains the highly insulating gas sulphur hexafluoride. In a closed position of each switch, a pivotable contact arm engages fixed contact fingers to permit the flow of load current therethrough. On opening of each switch, the contact arm pivots away from the fingers so that an arc is drawn therebetween, the arc subsequently being transferred from the fingers to a tubular electrode. The arc current then flows through a field coil connected in series with the electrode, such that a magnetic field is generated which causes the arc to rotate and become extinguished. The electrode and field coil are common to both switches, the contact arms of the latter being disposed respectively at opposite ends of the coil and being isolated from each other by a transverse insulating member disposed centrally in the electrode. The field coil is spirally wound so as to be symmetrical about a transverse plane through its centre, and therefore provides the same operating characteristics for each of the two switches.
REFERENCES:
patent: 1827516 (1931-10-01), Greenwood
patent: 2027219 (1936-01-01), Austin
patent: 3274365 (1966-09-01), Beatty
patent: 3471666 (1969-10-01), Barkan
Brown Charles E.
Macon Robert S.
South Wales Switchgear Limited
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