Dzn transformer, short circuit and currents on primary side of transformer.

[Cubus]

In a Dyn coupled transformer I know how the currents will be on the primary side when different types of short circuits happen on
the terminals on the secondary side.

But what are the rules on a Dzn coupled transformer (lets say an 400/400 V isolating transformer)?

 

[Don Kelly]

If I interpret it correctly, Dyn is a delta/grounded Y transformer and Dzn
is a delta/grounded zig-zag transformer where each leg of the zig-zag
consists of two windings in series-each fed from a different primary so that
for a voltage V on each winding, the total is V*root(3) and there is a 30
degree phase shift compared to a normal Dyn.

Data is likely out there if he would look -or use symmetrical component
analysis.
Of course the other problem is why Dzn?

 

[Cubus]

If I interpret it correctly, Dyn is a delta/grounded Y transformer and Dzn is a delta/grounded zig-zag transformer where each leg
of the zig-zag consists of two windings in series-each fed from a different primary so that for a voltage V on each winding, the
total is V*root(3) and there is a 30 degree phase shift compared to a normal Dyn.

Data is likely out there if he would look -or use symmetrical component analysis.
Of course the other problem is why Dzn?

The interpretation is correct. I still have not found the answer in any book
or the internet and I don't know symmetrical component analysis. Dzn
because that is what is installed in an actual case.

 

[Don Kelly]

The interpretation is correct. I still have not found the answer in any
book
or the internet and I don't know symmetrical component analysis. Dzn
because that is what is installed in an actual case.

It can be worked out by considering the basic phasors- but it does require
knowledge of just how the zig-zag windings are connected. (e.g. which phase
is tied to which phase on the zig-zag side)
As to convention- there may not be one.