Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1974-09-23
1977-01-11
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144AP, H01H 3366
Patent
active
040028674
ABSTRACT:
A vacuum-type circuit interrupter has a condensing shield which is maintained at a predetermined potential relevant to the separable contacts by the use of resistance means, which are tapped off to the condensing shield. The resistance means may assume either the form of a surface coating with a preselected resistance on the inside or the outside of the insulating envelope casing, or the resistance means could be a ceramic envelope casing having a preselected volume resistance. Additionally, the use of coatings of metals and/or semiconductors on the inside and/or the outside of the insulating envelope casing may be used to obtain the desired preselected surface resistance values. Even external circuitry, connected to the condensing shield and the contacts, may be used to achieve the proper resistance values.
The foregoing arrangements prevent the condensing shield from "floating" in potential value relevant to the separable electrodes, and gives rise to desirable results.
REFERENCES:
patent: 2453555 (1948-11-01), Thommen
patent: 3147356 (1964-09-01), Luehring
patent: 3160727 (1964-12-01), Colclaser, Jr. et al.
patent: 3541284 (1970-11-01), Wachta
patent: 3708638 (1973-01-01), Mitchell
Crout Willard R.
Macon Robert S.
Westinghouse Electric Corporation
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