Multi-Port Equivalent Scheme for Multi-Winding Transformers

What is it about?

The paper aims to present a new equivalent scheme of multi-windings traction transformers, based on multiport purely inductive circuit. The mathematical background of this equivalent scheme is described. The determination of the different scheme elements is made through a finite-elements calculation of both main and leakage inductances, for the case of a four-winding transformer. A procedure is defined, which allows to estimate the values of these elements from some measurements on the transformer at no-load and short-circuit operations. A specific strategy of short-circuit tests is described, allowing to determine all parameters in a rather simple way.

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Why is it important?

The multi-port circuit has been proposed as an equivalent circuit of set with an arbitrary number (N) of coils. In that representation the number of inductive elements is always equal to the number of independent self and mutual in¬ductances. This approach has been applied as an equivalent scheme of a multi-winding traction transformer. Traction transformers have many windings with very different tasks within the locomotive. There are windings connecting the line catenary to the traction supply system, some ones supplying power electronics drives and others feeding the auxiliary systems of the train. A proper representation of traction transformers is of a great interest for designers as well as for users.

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