Low voltage AC contactor including high recovery voltage gas sys

Details Low voltage AC contactor including high recovery voltage gas sys Low voltage AC contactor including high recovery voltage gas sys

1994-06-15

1997-05-13

Scott, J. R.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Air-current blowout

218 1, 218 43, 218 46, 218 85, 218 51, 218146, H01H 3304, H01H 930

Patent

active

056295065

ABSTRACT:
An AC contactor having a high recovery voltage strength includes a contact assembly and a high recovery voltage gas system coupled to the contact assembly. The contact assembly includes two contact pads per electrical phase, with one of the contact pads being attached to a positioning device that selectively disposes the contact pad between a closed circuit position and an open circuit position. The high recovery voltage gas system includes a thermal gas evolving medium for introducing a high recovery voltage strength gas into the gap between the contact pads, which gas has a high glow discharge cathode voltage fall value, as determined for silver-based contacts, of not less than about 300 volts, and typically greater than about 500 volts. The high recovery voltage strength gas typically comprises carbon monoxide, carbon dioxide, water vapor, or the like. The thermal gas evolving medium typically is as a Group IA carbonate (e.g., sodium bicarbonate), and is disposed in the contact assembly.

REFERENCES:
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patent: 2345375 (1944-03-01), Bennett
patent: 2347052 (1944-04-01), Hobson
patent: 2824194 (1958-02-01), Moorhead
patent: 3997746 (1976-12-01), Harper et al.
patent: 4465910 (1984-08-01), Martin
patent: 5416455 (1995-05-01), Moldovan et al.
James D. Cobin, Ph.D., "Gaseous Conductors," Dover Publications, Inc., New York.

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