Thermal model of a disk coil with directed oil flow

A model of a transformer disk coil with directed oil flow is presented which utilizes a network of oil flow paths. Along each path segment, oil velocities and temperature rises are computed. The oil flow is assumed to be thermally driven. The model includes temperature dependent oil viscosity, resis...

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Bibliographic Details
Published in1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Vol. 2; pp. 914 - 919 vol.2
Main Authors Del Vecchio, R.M., Feghali, P.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1999
Subjects
Coils
Drives
Ducts
Friction
Heat transfer
Hydraulic diameter
Oil insulation
Petroleum
Temperature dependence
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Summary:A model of a transformer disk coil with directed oil flow is presented which utilizes a network of oil flow paths. Along each path segment, oil velocities and temperature rises are computed. The oil flow is assumed to be thermally driven. The model includes temperature dependent oil viscosity, resistivity, oil density, and temperature and velocity dependent heat transfer and friction coefficients. Because of the nonlinearities, an iterative solution is necessary. Temperature and oil velocity profiles are computed. From this, the average winding rise and the hot spot temperature can be determined. The model can also be used for optimal positioning of the oil flow washers.
ISBN:9780780355156
0780355156
DOI:10.1109/TDC.1999.756171