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CFD ANALYSIS ON THE COOLING OF NON GUIDED OIL NATURAL AIR NATURAL TYPES OF TRANSFORMERS
KTH, School of Engineering Sciences (SCI), Mechanics.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

ABB is moving towards more powerful and compact transformers and an efficient cooling is of paramount importance in order to avoid overheating.In this master thesis, transformers without guides for the oil flow have been analysed: they allow a faster and cheaper manufacturing process, but at the same time the absence of guides makes the cooling design more difficult.In order to be able to perform several parametric studies, a script with the Pointwise mesher has been developed for the automatic generation of the geometry and mesh of transformer windings. This has allowed to analyse transformer windings with a different shape, assessing the effect of a certain number of geometrical parameters on the cooling efficiency.The software ANSYS Fluent was used to perform 2D axisymmetric unsteady simulations on the company cluster and the simulation set up was validated thanks to comparison with experimental measurements in ABB in Vaasa (Finland), that showed an average relative error below 2%.A remarkable result of this study is the identification of a periodic pattern in the temperature of the windings from the inlet to the outlet of the transformer, with hot spot locations every 10-20 disc windings. This conclusion has also been confirmed by the experimental measurements performed in Vaasa on a test transformer. Furthermore, a periodic behaviour of the temperature of the windings and of the oil in time has also been identified.Finally, transformers with an additional cooling channel in the disc windings have been studied, revealing that an accurate design is needed when adding oil channels through the windings in order to avoid the formation of unexpected hot spots.

Place, publisher, year, edition, pages
2016. , p. 114
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-203970OAI: oai:DiVA.org:kth-203970DiVA, id: diva2:1083454
External cooperation
ABB; Polytechnic University of Turin
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Examiners
Available from: 2017-03-21 Created: 2017-03-21 Last updated: 2017-03-21Bibliographically approved

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CFD ANALYSIS ON THE COOLING OF NON GUIDED OIL NATURAL AIR NATURAL TYPES OF TRANSFORMERS(33132 kB)149 downloads
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