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Electrical modeling of transformer connecting bars

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3 Author(s)
Clavel, E. ; Laboratoire d''Electrotechnique de Grenoble, Saint Martin D''Heres, France ; Roudet, J. ; Foggia, A.

Traditionally, connections in high-voltage, high-current, and low-frequency circuits are always considered as perfect short circuits, so to analyze their contribution to electrical performance of a structure is not considered necessary. We show here that, even for low-frequency structures, the electrical parasitic characteristics of cabling can lead to some unexpected performances. In particular, our study of outside connections of a 400 MVA transformer has shown current imbalances between the three phases and inside the phases. We achieved this by using a semianalytical method that is presented in this paper. Results show the need to model this part of the structure. This method has advantages over numerical techniques of calculation

Published in:

Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 2 )