Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1981-02-13
1983-12-20
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
044219610
ABSTRACT:
A vacuum power interrupting device comprising a bell-shaped vacuum power interrupter which includes a bell-shaped metallic casing wherein a pair of electrical contact rods are extended for interrupting a large current with a high voltage, and insulating molded block made of a resin for supporting the bell-shaped vacuum power interrupter. According to the present invention, there is provided a single-phase or three-phase vacuum power interrupting device comprising a vacuum power interrupter which includes a bell-shaped metallic casing, a ceramic insulating circular end plate fitted to the opening end of the bell-shaped metallic casing, and a pair of electrical contact rods having electrical contacts partially extended within the casing, being normally in contact with each other or moving away from each other, and an insulating molded block made of a resin into which the outer peripheral surface of the radially extended portion of the bell-shaped metallic casing and insulating circular end plate are integrally burried, whereby the atmospheric creepage distance from a movable electrical contact rod serving as an electrically charged portion is increased so that the atmospheric dielectric strength of the vacuum power interrupter becomes greater and a larger current with higher voltage can be interrupted.
REFERENCES:
patent: 3372258 (1968-03-01), Porter
patent: 3562682 (1971-02-01), Ohwada et al.
patent: 3812314 (1974-05-01), Nonken
patent: 4351992 (1982-09-01), Crouch
Miyagawa Hiroshi
Sakuma Shinzo
Tokuhata Kazuo
Yanagisawa Hifumi
Kabushiki Kaisha Meidensha
Macon Robert S.
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