Method and apparatus for increasing the rating of a transformer
First Claim
1. A method for improving a voltage rating of a transformer comprising:
- enclosing within an insulating material a portion of a first segment of a conductor that runs through a bushing having a first and second shoulder, said insulating material extending from said second shoulder of said bushing and increases a distance from an un-insulated portion of said first segment of said conductor to a wall of said transformer; and
assembling said transformer by connecting said bushing to a transformer casing with said second shoulder located on the outside of said transformer casing.
2 Assignments
0 Petitions
Accused Products
Abstract
The voltage class rating of a transformer is increased by increasing the rating of an off the shelf molded transformer bushing. Specifically, the voltage class rating is increased by increasing the distance from the non-insulated portion of a conductor of a transformer bushing and the transformer wall. A conductive extension is connected to the conductor of the bushing. Insulating material in the form of mastic and heat shrink tubing is applied to the external portion of the conductor and the extension. When the modified transformer bushing is installed into a transformer, an internal end of the conductor is made to extend below the surface of the oil in the transformer. The level of the oil also covers an internal insulating shoulder of the bushing. The insulating values of the mastic and heat shrink tubing and the insulating value of the conductor immersed in oil combine to increase the voltage class rating of the off the shelf molded transformer bushing and thereby the transformer, with a nominal increase in costs.
1 Citation
20 Claims
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1. A method for improving a voltage rating of a transformer comprising:
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enclosing within an insulating material a portion of a first segment of a conductor that runs through a bushing having a first and second shoulder, said insulating material extending from said second shoulder of said bushing and increases a distance from an un-insulated portion of said first segment of said conductor to a wall of said transformer; and
assembling said transformer by connecting said bushing to a transformer casing with said second shoulder located on the outside of said transformer casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transformer comprising:
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a transformer casing having an internal compartment and an external wall;
oil stored within said transformer casing; and
a bushing connected to an open end of said transformer casing via an insulating mounting bracket through which runs a conductor, wherein said insulating mounting bracket has an internal shoulder and an external shoulder relative to said transformer casing, and said bushing includes an insulating material connected to and extending from said external shoulder to cover a portion of said conductor, which extends from said external shoulder, wherein a distance from an un-insulated portion of said conductor to said external wall is increased and a voltage rating of said transformer is improved. - View Dependent Claims (12, 13, 14, 16, 18, 19, 20)
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15. An apparatus for improving a transformer voltage rating, comprising:
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a bushing having;
an insulating mounting bracket with a first and second shoulder;
a conductor running through said insulating mounting bracket with a front segment for connecting to transformer windings and a back segment for connecting to an external circuit; and
means for enclosing a portion of said conductor and said second shoulder of said insulating mounting bracket with insulating material, wherein a distance between an un-insulated portion of said conductor and a wall of said transformer is increased.
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17. A kit for improving a transformer voltage rating comprising:
a bushing having;
an insulating mounting bracket with a first and second shoulder;
a conductor running through said insulating mounting bracket with a front segment at said first shoulder for connecting to transformer windings and a back segment at said second shoulder for connecting to an external circuit; and
insulating material for enclosing a portion of said back segment of said conductor, and said second shoulder of said insulating mounting bracket.
Specification