Title :
A Simple Model for Calculating Transformer Hot-Spot Temperature
Author :
Susa, Dejan ; Nordman, Hasse
Author_Institution :
Energy Res. Dept., SINTEF, Trondheim
fDate :
7/1/2009 12:00:00 AM
Abstract :
A simple model for calculating the hot-spot temperature is introduced. The model is based on the hot-spot to ambient gradient. The model considers the changes of the oil viscosity and winding losses with temperature. The results are compared with temperatures calculated by IEEE Annex G method and measured results at varying load for the following transformer units: 250-MVA ONAF, 400-MVA ONAF, and 605-MVA OFAF.
Keywords :
power transformers; transformer oil; transformer windings; IEEE Annex G method; oil viscosity; transformer hot-spot temperature; winding loss; Capacitance; Coils; Fitting; Oil insulation; Petroleum; Power transformers; Temperature; Thermal resistance; Transformer cores; Viscosity; Hot-spot temperature; oil viscosity; top-oil temperature; winding losses;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2009.2022670
