Modelling of mechanical and electrical stresses of distribution transformers

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Dr. Tamus Zoltán Ádám
Department of Electric Power Engineering

The design of a distribution transformer is a very complex task. There are many factors to be considered such as the effects of mechanical forces due to short-circuit current, since the electromagnetic force is proportional to the square of current. An other important factor is the sizing of the insulation system.

There are many analytical estimates to solve these problems, but this method has disadvantages. This work attempts to prove the utility of Finite Element Method simulation tools to calculate mechanical and electrical stresses in distribution transformers. With the simulation it may become easier to calculate the mechanical forces in a transformer winding or proportion the oil-paper insulation. The main advantages of the proposed method are: detailed representation of the electric and magnetic fields, enhanced model accuracy, accurate definition of the critical points of the transformer. Through an automated design process, the application can be integrated into the construction process.


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