Comparative analysis of a conventional and a superconducting power transformer

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Dr. Vajda István
Department of Electric Power Engineering

Electricity networks are all around our world. The possibility of resistance-free conduction has excited the human race long time ago. Since Heike Kamerlingh Onnes in 1911, discovered the phenomenon of superconductivity, the engineers are trying to take advantage of the resistance-free conduction in various ways. As a developing industry, superconductivity must overcome several drawbacks such as high material costs and low temperature requirement. A second breakthrough happened in 1987, when materials having their critical temperature above 90 K were discovered. These materials are so-called second generation superconductors.

Using second generation superconductors, in my thesis I am planning the superconducting equivalent of a widely used Hungarian 25 MVA transformer. I will compare the size, the losses and the costs of the chosen conventional reference transformer with the planned superconducting version. As a result of this comparison I am reaching my conclusion about the actual state of the superconducting transformer applications.

Throughout the design process I am planning a transformer that fits the fault specifications in the usual manner as a conventional transformer. In my conclusion I am discussing other ways to design the transformer in order to meet the fault specifications by using the superconductor’s special properties.


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