H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/215
H01H 33/66 (2006.01) H01H 33/56 (2006.01)
Patent
CA 1102378
ENCAPSULATED VACUUM SWITCH HAVING IMPROVED SWITCH ARM SEAL Abstract of the Disclosure 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 acces- sible 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 liklihood 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 com- munication with the cavity to permit thermal expansion and contraction of the dielectric fluid without undesired leakage or cavitation of the liquid.
313836
Azdell L. Ronald
Bruning Armin M.
Graham Richard
Gritton Earl S.
Kamp Eugene L.
Chance (a. B.) Company
Gowling Lafleur Henderson Llp
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