Dynamic behaviour of transformer winding under short-circuits

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dc.contributor.author Minhas, Muhammad Salman Aslam
dc.date.accessioned 2008-04-17T12:30:05Z
dc.date.available 2008-04-17T12:30:05Z
dc.date.issued 2008-04-17T12:30:05Z
dc.identifier.uri http://hdl.handle.net/10539/4764
dc.description.abstract The work presented in this thesis contributes to the understanding of the dynamic behaviour of large power transformer windings under short circuit forces. A simple yet accurate method of prediction of electromagnetic forces is developed and used as input to the dynamic mechanical model. In develop- ing this model the mechanical properties of oil-impregnated pressboard have been investigated and measured in a specially designed rig which simulates the typical power transformer environment. Assumptions have been made regarding these properties to enable them to be meaningfully incorporated in a dynamic model of a transformer. Predictions made using the model have been compared with actual measurements on a transformer and a correlation within 20%-30% was achieved. The work demonstrated the importance of mechanical prestress to ensure that no serious nonlinearities will be encoun- tered in the mechanical behaviour when short-circuit forces are present in a power transformer. It was also found that for small radial deflections, the axial and radial behaviours are independent. This work provides a theoreti- cal basis for further work in which precise determinations of the mechanical properties of oil-impregnated pressboard can be used to model the dynamic behaviour of a large transformer to a high degree of accuracy. en
dc.format.extent 4394927 bytes
dc.format.extent 13716 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso en en
dc.subject electric transformers en
dc.title Dynamic behaviour of transformer winding under short-circuits en
dc.type Thesis en

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