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Finite element modelling of LV transformer winding to simulate dynamic events occurring under short circuit: In Ansys Mechanical
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
2020 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The ability to withstand a short circuit is the most essential feature of a power transformer. The most important reason to design short-circuits proof transformers is to ensure the reliability of the power grid (avoiding black outs etc.) and safety (fire and explosion in case of failure). During short circuit, the most effected winding is the LV winding due to the flow high currents even during the normal working condition. So during a short circuit large forces are generated which act on the winding and these forces can reach hundreds of tons in fraction of a second, so the transformer must be properly designed in order to withstand these forces or the transformer can fail in different ways. One of the possible failure modes called “Spiraling” is discussed and analyzed in this thesis. Spiraling Occurs when the LV winding twists tangentially in the opposite direction at the ends due to radial short circuit forces. From literature study the transient forces acting on the winding during a 3-phase short circuit was determined and these transient forces were used to perform simulations on the model. The axial and radial forces applied on the model were such that it has a uniform magnitude per each turn. Various analysis was performed on the model which includes the Static, Modal and Transient Structural analysis in Ansys Workbench and each analysis involved parametric analysis where the deformations and the torsional mode shapes were determined

Place, publisher, year, edition, pages
2020. , p. 50
Keywords [en]
Ansys Mechanical, LV winding, Power Transformer, Short-circuit, Spiraling, Torsional Mode Shapes
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:bth-20872OAI: oai:DiVA.org:bth-20872DiVA, id: diva2:1512283
External cooperation
Hitachi ABB Power Grids
Subject / course
MT2565 Master's Thesis in Mechanical Engineering - Structural Mechanics
Educational program
MTAMT Master of Science Programme in Mechanical Engineering with emphasis on Structural Mechanics
Supervisors
Examiners
Available from: 2020-12-28 Created: 2020-12-22 Last updated: 2020-12-28Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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