Temperature distribution in resin impregnated paper insulation for transformer bushings

The overall reliability of a power transformer depends to a great extent on the sound operation of the bushings thereof. Oil impregnated paper (OIP) insulated bushings have been in use for a long time now. In many situations, it becomes necessary to avoid OIP insulation in bushings. In the recent pa...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2010-06, Vol.17 (3), p.931-938
Main Authors: Jyothi, N S, Ramu, T S, Mandlik, Manoj
Format: Article
Language:English
Subjects:
Bushings
Conductivity
Crepe
Electric potential
Electric power generation
Epoxy resins
Insulation
Insulators
Oil insulation
Paper technology
Petroleum
Power transformer insulation
Power transformers
Temperature distribution
Transformers
Voltage
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Summary:The overall reliability of a power transformer depends to a great extent on the sound operation of the bushings thereof. Oil impregnated paper (OIP) insulated bushings have been in use for a long time now. In many situations, it becomes necessary to avoid OIP insulation in bushings. In the recent past, a new technological breakthrough has been achieved whereby the OIP is replaced by epoxy resin impregnated crepe paper (RIP) insulation. This new system has several advantages over OIP and has now become the insulation of choice. However, its long time thermal and electrical performance need to be carefully assessed. This paper reports the results of a study of temperature distribution in the body of insulation, based on the ac conductivity of RIP insulation. A method of computing the maximum thermal voltage of this system is also given.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2010.5492269