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Transformer Connection

Transformer Connection

Transformer Connection

(OP)
In hydro-electric plants in our country,the excitation transformer connection is Dy5. What is the reason for this connection.Why not normal Dy11 connection ?

In some countries generator tarnsformer connection is Yd5.Any special reason for this, instead of usual YD1 or 11 connection.

RE: Transformer Connection

What means "normal Dy11 connection"? In our country usually transformers are Dy5 - according to me this is as normal as Dy11. Important is not to put them in parallel smile

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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
 

RE: Transformer Connection

Dy5 and Dy11 transformer secondary phase shifts are 180 degrees apart.  One has a wye winding  made up by connecting the three non-polarity ends of the windings at the neutral, the other has the polarity ends connected together.

I'm not a transformer designer so I don't know the benefits of either design.  They seem the same to me.

The exciter transformer output is going to a rectifier that puts out DC which has no "phase" orientation.

RE: Transformer Connection

(OP)
When I said normal means normal in "my " country.So Iam curious why in my country, only for this particular  application, 180 degree shift Dy5 should be used.

Thank you wilson.You are right -designwise there is no difference between 11 and 5 o'clock except for connections.My query is whether this has anything to do with the nature of load coming on secondary side? Hydro power experts may be able to throw some light.

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