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Transformer delta winding impedances \ equivalent conventions

Transformer delta winding impedances \ equivalent conventions

Transformer delta winding impedances \ equivalent conventions

(OP)
Hi,

Am I correct in thinking that conventional % impedances from short circuit tests assume a Y winding transformer equivalent?

If I have a delta winding with a short circuit impedance in % on transformer MVA - I believe conventionally this means each phase can be represented as an ideal winding (phase voltage) in series with the impedance.

How do I calculate the impedance of each actual winding in the Delta winding? (for an equivalent with an ideal winding (line voltage) in series with an impedance to represent one side of the delta.)

Is it as simple as applying the Y->D transformation?

Thanks for any guidance.

RE: Transformer delta winding impedances \ equivalent conventions

The impedance is the equivalent impedance of the primary and secondary windings with their mutual impedances.  You are correct that this is on a per phase basis.  You cannot mathematically calculate the individual winding impedances and mutual impedances from the equivalent impedance, in either wye or delta.
 

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