Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1984-10-24
1986-05-27
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144R, 200148R, 200252, H01H 3312
Patent
active
045916802
ABSTRACT:
In this isolating switch, which is suitable for electrically isolating and connecting components of gas-insulated encapsulated switching stations under, at the most, low load conditions, the fixed contact member (1) is provided with a central trailing contact (2) which ends in a contact member (7). It is coaxially surrounded by a circle of rated-current fingers (3a-h) and a fixed contact shielding electrode (15). The central contact rod (5) of the movable contact member (4) is coaxially surrounded at a distance by a shielding electrode (6) which is also movable.
In order to prevent undesirable flash-overs, in particular flash-overs at the encapsulation, the rated-current fingers (3a-h) are in contact with the contact rod (5) in the area surrounded by the shielding electrode (6) which is also movable. They are mounted to be rotatable and have forces applied to them which press their end members (14a-h) radially inward. The contact member (7) is constructed as a shield-like plate having a front face (21) which is domed forward towards the movable contact arrangement (4). When the trailing contact (2) is pushed back, the rated-current fingers (3a-h), which are located behind the front face (21) when the trailing contact (2) is pushed forward, project through openings (22a-h) in the contact member. The contact rod (5) and, on its inside, the shielding electrode (6) which moves along with the former are provided with circumferential grooves (19,20).
REFERENCES:
patent: 896210 (1908-08-01), James
patent: 3278711 (1966-10-01), Thuries et al.
patent: 4338500 (1982-07-01), Pham Van et al.
patent: 4427858 (1984-01-01), Fehr et al.
patent: 4499351 (1985-02-01), Koppl
BBC Brown Boveri & Co. Ltd.
Macon Robert S.
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