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omkar_991
Associate

Join Date: Jun 2007
Posts: 25

Delta Transformer

06/15/2007 2:27 PM

Can a Y-delta transformer be short circuited on the delta side for the SC test?

When the 3 windings of the delta side are already connected in a mesh, then why doesn't a circulating current of the fundamental frequency flow in it? Why only triplen harmonics can flow in it?
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Snakers
Power-User

Join Date: Apr 2007
Posts: 178
Good Answers: 3
#1

Re: Delta Transformer

06/16/2007 4:48 PM

Draw the phase vectors of the fundamental and the triplen harmonics. You will find that in a Delta winding the fundamental is in a normal positive sequence function and the Triplen harmonics are zero sequence functions and short circuited.

Reference: "sequential components" in your power engineering handbook.

Large values of triplen harmonics can burn up a WYE / DELTA wound power transformer with no abnormal outside metering indications. I have seen some Biguns smoke out.

Snakers.
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