Cast-resin insulated instrument transformer, in particular potential transformer
OwnerFriedrich Raupachinventor
Life of this patent
Estimating the term…
Abstract
The transformer, in particular a potential transformer, comprises a generally planar bushing insulator, dimensioned for a liquid or gaseous insulating medium and coaxially enclosing a high-voltage connector, and a flange section enclosing the bushing insulator. The bushing insulator is also enclosed by an intermediate flange filled with a liquid or gaseous insulating medium. One end of the intermediate flange is connected to the instrument transformer and the other end of the intermediate flange is connected to a self-contained high-voltage bushing. A high-voltage connector of the transformer is connected to a conductor of the high-voltage bushing in the space enclosed by the intermediate flange.
Claims7
In a compact cast-resin insulated instrument transformer having a cast-resin body and a high-voltage connector extending out of the body, the improvement comprising:
- a generally planar cast-resin bushing insulator connected directly to said body and coaxially encircling said high-voltage connector, said insulator having a plurality of coaxially arranged sheds extending upwardly therefrom to increase creepage distance, said sheds respectively increasing in height in a direction radially outwardly from said high-voltage connector, a pair of coaxial guide sleeves disposed radially inwardly of said sheds, and a cast-resin flange section surrounding the periphery of said bushing insulator;
- a high-voltage bushing having a conductor extending therethrough, and one end thereof dimensioned to be insertable within said guide sleeves for aligning the same on said bushing insulator immediately adjacent to said high-voltage connector;
- means for connecting the conductor of said high-voltage bushing to said high-voltage connector;
- and
- an intermediate flange defining a fluid-tight enclosure to be filled with a fluid insulating medium, one end of said intermediate flange being connected to said cast-resin body and enclosing said sheds, the other end of said intermediate flange being connected to said high-voltage bushing thereby enclosing said connection between said shield and said high-voltage connector within said fluid insulating medium of said intermediate flange enclosure.
A compact cast-resin insulated instrument transformer including a core, high and low voltage windings and a high-voltage connector, comprising:
- a cast-resin body embedding the core, windings and connector extending upwardly therefrom;
- a cast-resin bushing insulator integrally formed with said body and encircling the connector, said integrally formed insulator including a generally planar surface, a plurality of coaxial sheds integrally formed with the planar surface and projecting upwardly therefrom, and a flange section integrally formed with said insulator and extending around the periphery thereof;
- a high-voltage bushing having one end disposed radially inwardly of said sheds and immediately adjacent the connector for a detachable connection thereto;
- and
- an intermediate flange encircling said high-voltage bushing and the sheds, said intermediate flange defining a fluid-tight enclosure therearound to be filled with a fluid insulating medium, and having one end connected to said high-voltage bushing and the other end directly connected to the flange section of said insulator to provide a compact transformer design of less weight than tank enclosed designs.
Dependencies are inferred from the claim text.