Estimation of the hottest spot temperature (HST) in power transformers considering thermal inhomogeniety of the windings

The degradation of electrical insulation in transformers is traced to thermoelectric processes. Existence of localized hot regions due to thermal insulating properties of electrical insulation would cause thermal runaway around these regions. In an earlier paper , the authors presented analytical me...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2004-10, Vol.19 (4), p.1704-1712
Main Authors: Pradhan, M.K., Ramu, T.S.
Format: Article
Language:English
Subjects:
Applied sciences
Coils (windings)
Cooling
Dielectrics and electrical insulation
Electric power generation
Electrical engineering. Electrical power engineering
Electrical insulation
Exact sciences and technology
Exact solutions
Fourier transforms
Mathematical analysis
Mathematical models
Petroleum
Power electronics, power supplies
Power transformer insulation
Power transformers
Temperature
Thermal conductivity
Thermal degradation
Thermoelectricity
Transformers
Transformers and inductors
Windings
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Summary:The degradation of electrical insulation in transformers is traced to thermoelectric processes. Existence of localized hot regions due to thermal insulating properties of electrical insulation would cause thermal runaway around these regions. In an earlier paper , the authors presented analytical methods for estimating the temperature and its distribution at different points of the transformer based on a closed-form mathematical technique using a generalized heat conduction (GHC) model. Certain aspects of the inhomogeniety of the several components of the winding and incorporation of distributed heat source were not addressed. Also, a rigorous treatment involving the changes in winding resistance, which was built into the thermal model as an empirical correction factor, has now been modified and incorporated in the GHC. These considerations have now improved the accuracy of estimation of hottest spot temperature.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2004.835291