|May11-11, 01:07 PM||#1|
Transformer vector group Dyn11 and Dyn1
please i need your help to answer the following question
what the difference between transformer Dyn11 and Dyn1
i know the difference is in leading and lagging of line to line voltages of primary and secondary
but the question is , when i should use Dyn11 or Dyn1 as a must in the network
does it depends on the type of load ?
all what i know that in parallel operation the 2 transformers must be exactly the same ,
but what according to what in the first place we choose Dyn1 or Dyn11
anybody have an idea ???
|May11-11, 06:14 PM||#2|
Dy11 signifies a Delta Primary (primary has an upper case letter), Wye secondary (secondary has a lower case letter) and the orientation of the 3 phase diagram, relative to the A phase on a clock face pointing to 11 o'clock.
So draw 3 vectors 120 degrees apart to represent the 3 phases, but start with your reference phase (A phase) at 11 o'clock.
Dy1 would hence be a Delta primary, Wye secondary and a vector diagram with the reference vector pointing at 1 o'clock.
I believe most 3 phase textbooks have the vector diagram with the reference vector at 0 degrees on the x-axis, which would equate to 3 o'clock, then with B at 11 o'clock and C at 7 o'clock.
And yes, if you want to parallel transformers they have to be of the same vector group or you will have circulating currents and associated problems.
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