Transformer with three windings. The dots show the relative configuration of the windings.
Transformer with electrostatic screen preventing capacitive coupling between the windings.
In an electric arc furnace, the transformer has a heavy copper bus for the low voltage winding, which can be rated for tens of thousands of amperes. Winding beginnings and ends are led out separately and "interleaved" for the external delta closure in a Knapsack connection.[1] The transformers are immersed in oil for cooling and insulation, and are designed to withstand frequent short circuits.
A variety of types of electrical transformer are made for different purposes. Despite their design differences, the various types employ the same basic principle as discovered in 1831 by Michael Faraday, and share several key functional parts.
^G. Volkert, K.-D. Frank (1972) "Metallurgie der Ferrolegierungen", page 131, Springer Verlag, Berlin, Heidelberg, New York ISBN 978-3-642-80580-6
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