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Post by Sudhakaran on Jan 30, 2014 2:56:06 GMT -5
Why Distribution transformer are Dy 11 Vector?, what are the advantages of it.
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Post by Davis on Jan 30, 2014 3:06:40 GMT -5
For Distribution Transformer, we use a Delta-Star Transformer. This is because the HV Delta winding requires only 3 inputs. No neutral is required. The secondary Star has a neutral which is earthed. The neutral Current which flows in the secondary is supplied by the delta primary itself. This is an advantage of the Delta-Star Transformer.
During Star to Delta Transformation, there is a phase shift of 30 degrees which is unavoidable. Thus a distribution Transformer can be Dyn11 or Dyn5.
However, as a matter of convention, the Dyn11 is used. Having a uniform vector group makes it easy to parallel transformers when necessary.
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