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The use of non-linear (solid state) loads in power system has increased the awareness of the potential reduction of a transformer life due to the increased losses. Manufacturers and users have been applying IEEE C57.110-1989 which gives a conservative estimate of loading capability of transformers. In this paper, the effect of harmonics on transformers is discussed and a thermal model to predict a...
This paper presents a thermal model of a power transformer in the form of simple equivalent circuit. The model is established to calculate the top oil and hot spot temperatures. The model parameters are obtained from manufacturer test data and an electromagnetic analysis using finite element method (FEM). The model results are compared with measured data obtained from 250 MVA, 230plusmn8times1.5%/118/21...
Summary form only given. The aim of This work is to introduce hot-spot and top-oil temperature thermal models for more accurate temperature calculations during transient states, based on data received in a normal heat run test (i.e. the top oil in the tank of transformer and the average winding-to-average oil gradient). Oil viscosity changes and loss variation with temperature are taken into account...
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