CALCULATION OF TEMPERATURE RISES IN DISC TYPE WINDINGS WITH DIRECTED OIL FLOW  Fulltext 

[ Mehdi Abloo ] - M. Sc in Mechanical Engineering, Convert of Energy, Engineering and Design Department of Iran Transfo Company
[ Seyed Mehdi Pesteei ] - Ph. D in Mechanical Engineering, Faculty Member of Urmia University Engineering and Design Department of Iran Transfo Company

خلاصه مقاله:

In this paper, a model of a disc type winding for a transformer 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 model includes temperature dependent oil density, resistivity, and oil viscosity and temperature and velocity dependent heat transfer and friction coefficients. Because of the non- linearity, an iterative solution is necessary. Temperature and oil velocities are computed and compared with experiment values. From this, the average winding temperature rise and the hot spot temperature can be determined.

Directed-Cooling-Transformer-Hot spot