Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1988-08-31
1990-06-12
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144R, 200255, 200288, 200 50AA, A01H 3318
Patent
active
049335197
ABSTRACT:
A grounding switch device for a metal-clad switchgear is adapted to be inserted into a standard circuit breaker cell allows the bus and line conductors within the switchgear assembly to be grounded for maintenance. A plurality of fixed and selectable test ports are provided to facilitate various electrical tests. The ground switch device is disposed on a frame and contains a ground contact assembly for providing sliding contact between the ground switch device and the ground bus within the circuit breaker cell. The ground contact assembly is in electrical contact with a movable contact. The movable contact is adapted to engage a stationary contact mounted on a mounting plate, attached to the frame by way of an insulator. A selector switch assembly connects the stationary contact to either the upper bus terminals or line terminals in the metal-clad switchgear assembly. The contact portion of the movable contact is U-shaped having two spaced-apart blades. Each blade is adapted to be received in a jaw portion of the stationary contact assembly. The jaw portions of the stationary contact assembly are formed by a pair of U-shaped current loops having inwardly facing protrusions disposed intermediate the bight portion. These protuberances force the contact arm into the jaw when the switch is closed on a live circuit. A combination spring and damper is disposed adjacent the protrusion to provide contact pressure when the ground switch contacts are closed and also to prevent contact bounce which can cause arcing and welding of the assembly.
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Westinghouse, "VAC Clad-M Medium Voltage Metal-Clad Switchgear" Bulletin 32-255.
Westinghouse, "World-Class Medium-Voltage Switchgear with VCP-W Vacuum Circuit Breakers", Bulletin SA-11575.
Westinghouse, "VaClad-W The New Standard of World-Class Performance".
Bottegal Paul T.
Milianowicz Stanislaw A.
Patel Nagar J.
Remic, Jr. Henry J.
Macon Robert S.
Moran M. J.
Westinghouse Electric Corp.
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