Method and apparatus for increasing the rating of a transformer

Details Method and apparatus for increasing the rating of a transformer Method and apparatus for increasing the rating of a transformer

H - Electricity

01

F

H01F 27/28 (2006.01) H02P 13/00 (2006.01)

Patent

CA 2308044

The voltage class rating of a transformer is increased by increasing the rating of an off the shelf molded transformer bushing. The rating is increased by increasing the distance from the non-insulated portion of a conductor of a transformer bushing and the transformer wall is increased. A conductive extension is connected to the conductor. Insulating material in the form of mastic and heat shrink tubing is applied to the external portion of the conductor and extension. When the modified transformer bushing is installed into a transformer, an internal end of the conductor extends 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 tubbing and the insulating value of the conductor immersed in oil, combine to increase the voltage class rating of an off the shelf molded transformer bushing and thereby the transformer.

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