Improvement of thermal performance of generator step-up transformers (CROSBI ID 215303)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Sitar, Robert ; Janić, Žarko ; Štih, Željko
engleski
Improvement of thermal performance of generator step-up transformers
Generator step-up transformers have high losses in structural parts due to high current leads. As distribution of magnetic field is nonuniform it may easily cause high local losses and high temperature rises. This paper studies impact of aluminum shields on losses and temperature rise. Using a 3D finite element method (FEM) software, calculations for five different leads arrangement are done on a model of a 220 MVA transformer with phase current of 4.4 kA. Influence on results of non-linear magnetic property and non-linear thermal parameters are studied as well. Finally, calculation results are verified by measurements. Experiment has confirmed that aluminum shield is a correct measure for reducing tank local overheating.
Aluminum shield; High current; Power transformer; Stray loss; Heat transfer
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Podaci o izdanju
78
2015.
516-524
objavljeno
1359-4311
10.1016/j.applthermaleng.2014.12.052