Switch contact device for interrupting high current, high...

Details Switch contact device for interrupting high current, high... Switch contact device for interrupting high current, high...

2005-01-04

2005-01-04

Donovan, Lincoln (Department: 2832)

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Contact structure

C218S146000, C200S252000

Reexamination Certificate

active

06838632

ABSTRACT:
A high voltage switch contact structure capable of interrupting high voltage, high current AC and DC circuits. The contact structure confines the arc created when contacts open to the thin area between two insulating surfaces in intimate contact. This forces the arc into the shape of a thin sheet which loses heat energy far more rapidly than an arc column having a circular cross-section. These high heat losses require a dramatic increase in the voltage required to maintain the arc, thus extinguishing it when the required voltage exceeds the available voltage. The arc extinguishing process with this invention is not dependent on the occurrence of a current zero crossing and, consequently, is capable of rapidly interrupting both AC and DC circuits. The contact structure achieves its high performance without the use of sulfur hexafluoride.

REFERENCES:
patent: 3239637 (1966-03-01), Pierce
patent: 4426562 (1984-01-01), Kemeny
patent: 5818148 (1998-10-01), Shiomi
patent: 5898142 (1999-04-01), Ohtaki et al.

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