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US 6,787,704 B2Granted
Method and apparatus for increasing the rating of a transformer
OwnerDonald W. Oweninventor
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OwnerDonald W. Oweninventor
Estimating the term…
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.
An apparatus that provides improved transformer voltage rating, comprising:
A bushing assembly kit for improving a transformer voltage rating comprising:
Dependencies are inferred from the claim text.