Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1996-09-26
1998-05-26
Picard, Leo P.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337 6, 337168, 361603, 361608, 200 5021, 200 5027, H01H 8520, H02B 500
Patent
active
057572607
ABSTRACT:
Fuses for the potential transformers (PTs) in medium voltage switchgear are mounted in fuse assemblies which are reciprocated within the switchgear enclosure independently of the transformers they protect between a connected position in which the fuse assemblies engage stabs at the rear wall of the enclosure and a retracted position adjacent a door at the front of the enclosure through which the fuses are inserted and removed while the fuse assemblies remain within the enclosure. The fuse assemblies include insulative tubes having first releasable contacts at a distal end which engage the stabs and second releasable contacts which engage fixed contacts connected to the transformers and spaced from the rear wall. The insulative tubes are mounted on a carriage which reciprocates between the connected and retracted positions. An interlock prevents opening of the door except where the carriage is in the retracted position and blocks movement of the carriage with the door open. The carriage can be alternatively turned over so that it can serve a transformer mounted over or under the fuse assembly, or two units, one having a connection facing upward and the other having its connection facing downward, can be inserted between an upper and lower transformer.
REFERENCES:
patent: 3896353 (1975-07-01), Burton et al.
patent: 3991348 (1976-11-01), Evans
patent: 4233643 (1980-11-01), Iverson et al.
patent: 5001600 (1991-03-01), Benson
OEM Switchgear Component Products, EATON Corporation, SA-12098, File No. 33-700, May 1996.
Westinghouse VacClad-W Medium Voltage Metal-Clad Switchgear, EATON Corporation, Application Data: 32-265, Mar. 1996.
Marchand Francois
Smith James E.
Yanniello Robert
Eaton Corporation
Gandhi Jayprakash N.
Moran Martin J.
Picard Leo P.
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