Unbalanced operation of delta/delta power transformers

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Zifkwong

Member
I am curious as to what are some of the consequences of operating a three phase 45 MVA delta to delta transformer unbalanced. The particular situation that I am curious about occured with an electric arc furnace transformer that was operated for 15 minutes with two legs at 36000 Amps and one leg at 0 Amps. Any comments? In particular what should be inpected next time the transformer is de-energized?
 

rattus

Senior Member
I believe the load in the third leg would not be zero The third leg would try to supply a portion of the load--unless the secondary was open.
 
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