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In a Dyn11 transformer, how are the 3 windings of the delta
connected? Assume that R1-R2, Y1-Y2, B1-B2 are the 3
windings on the HV side.
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Answer Posted / josyula ravikumar
In a Dyn11 transformer,Hv windings in delta conection and
LV in star only as the vector symbol represents in first
and second letters. numeral 11 indicates that when we super
impose the secondary voltage vector on to the primary one
secondary voltage vector leads the primary vector by 30
degrees.when we superimpose and make a study on delta side
imagine the neutral.
By connecting R1-Y2,Y1-B2,B1-Y2 and taking R1, Y1 and B1 to
terminals DYn11 will be achived. The same transfomer can be
changed to Dyn1 by interchanging the connections in delta.
i.e, R2-Y1;Y2-B1;C2-R1.
| Is This Answer Correct ? | 6 Yes | 5 No |
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Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
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