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CFD Study On The Thermal Performance of Transformer Disc Windings Without Oil Guides
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Division of ETT)
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

The hotspot temperature of disc windings has a close relation with the transformer age. In oil immersed transformers, oil guides are applied generally to enhance the cooling effects for disc windings. In some cases disc windings without oil guides are used. However, the lack of oil guides is expected to result in a more complicated thermal behavior of the windings, making it more difficult to predict the location and strength of the hotspot temperature (i.e. the hottest temperature in the winding). To get an improved understanding of the thermal behavior, a CFD study has been performed.  This article describes the implementation of CFD simulation for 2D axisymmetry models without oil guides, and then analyzes the results of a series of parametric studies to see the sensitive factors influencing the cooling effects. These parameters include radial disc width, inlet mass flow rate, horizontal duct height, vertical duct width and the inlet/outlet configurations. Three main characteristics, the hotspot temperature, the location of the hotspot and the number of oil flow patterns are detected to describe the thermal performance. 

Place, publisher, year, edition, pages
2010. , 77 p.
Keyword [en]
Non-oil guided, disc windings, CFD, parametric study
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-102546OAI: diva2:555385
Subject / course
Energy Technology
Educational program
Master of Science - Sustainable Energy Engineering
2012-06-05, meeting room, Brinellvägen 68, Stockholm, 17:48 (English)
Available from: 2012-09-21 Created: 2012-09-19 Last updated: 2012-09-21Bibliographically approved

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Jiao Yuhe EGI-2012-089MSC EKV915(3401 kB)2926 downloads
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