Distribution transformer having a primary disconnect switch
AssigneeWestinghouse Electric Corp.
InventorsDonald J. Ristuccia, John F. Cotton
Life of this patent
Estimating the term…
Abstract
An oil-filled distribution transformer having a primary disconnect switch disposed within the housing and utilizing two movable bridging contacts and four stationary contacts for completing a series circuit therethrough. The switch includes a trip mechanism, a bimetal element isolated from the current path through the switch and responsive to the temperature of the oil to activate the trip mechanism upon overtemperature condition, and a float mechanism attached to the switch and cooperating with the trip mechanism so that the float assembly will activate the trip mechanism when the oil level within the housing drops below a predetermined value.
Claims10
A high voltage disconnect switch, comprising:
- a metal base;
- two sets of stationary contacts, each set having first and second contacts;
- means for electrically connecting said second contacts;
- two movable bridging contacts;
- two metal contact arms movable between open and closed positions;
- first insulating means outwardly extending from said base in a plane parallel to said base for supporting said stationary contact sets;
- second insulating means for supporting each of said bridging contacts upon one of said contact arms;
- and
- an operating mechanism attached to said base for operating said contact arms between open and closed positions, each of said bridging contacts connecting first and second contacts of each contact set when said contact arm is in the closed position and being spaced away from said stationary contact sets when said contact arm is in the open position.
An oil-filled distribution transformer, comprising:
- a housing;
- primary and secondary coils supported within said housing;
- a high voltage disconnect switch disposed within said housing and connected to said primary coil, said disconnect switch being operable between a closed position permitting current flow through said primary coil and an open position preventing current flow through said primary coil, said switch comprising a metal base, two pairs of stationary contacts, one contact of each pair being interconnected, insulating means extending outward from said base in a plane parallel to said base and supporting said stationary contacts, two bridging contacts each movable between a closed position connecting the contacts of each stationary contact pair and an open position spaced away from said stationary contact pairs, two metal contact arms, each arm supporting one of said bridging contacts, means for insulating said bridging contacts from said contact arms, and an operating mechanism operable to move said contact arms and operate said bridging contact between open and closed positions.
A distribution transformer, comprising:
- an oil-filled housing;
- primary and secondary coils disposed within said housing;
- a high voltage disconnect switch disposed within said housing, said switch being connected to said primary coil and operable between a closed position permitting current flow through said primary coil and an open position preventing current flow through said primary coil, a mechanism for operating said disconnect switch between open and closed positions, releasable trip means connected to said mechanism and operable upon release to automatically operate said mechanism and move said disconnect switch from the closed to the open position, and bimetal means disposed within said housing isolated from the current path through said switch and responsive to the temperature of the oil, said bimetal means releasing said trip means when the oil temperature rises above a predetermined level.
Dependencies are inferred from the claim text.