Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1977-10-31
1980-01-15
Ross, Herbert F.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
174 17LF, H01H 904, H01H 2108
Patent
active
041840593
ABSTRACT:
A high dielectric strength seal between the encapsulant and the outwardly projecting actuating arm of an externally operable encapsulated vacuum switch includes a fluid-receiving sealed cavity surrounding the actuating arm between the latter and the encapsulant. An externally accessible valve permits charging of the cavity with a dielectric fluid subsequent to encapsulation of the switch to insure displacement of air from the interface between the encapsulant and actuating arm, thereby greatly reducing the likelihood of corona formation and dielectric breakdown of the seal. Additionally, the dielectric fluid may be pressurized through the valve to preclude infusion of conductive contaminants into the cavity. In preferred forms, an accumulator is in fluid communication with the cavity to permit thermal expansion and contraction of the dielectric fluid without undesired leakage or cavitation of the liquid.
REFERENCES:
patent: 461239 (1891-10-01), Foster
patent: 2575726 (1951-11-01), Peck
patent: 2914744 (1959-11-01), Schendel
patent: 3522404 (1970-08-01), Trayer
patent: 3602679 (1971-08-01), Odom
patent: 3878314 (1975-04-01), Link
Azdell L. Ronald
Bruning Armin M.
Graham Richard
Gritton Earl S.
Kamp Eugene L.
A. B. Chance Company
Ross Herbert F.
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