Transformer

Dyn11 Delta connected HV winding, star connected LV winding with neutral brought out, LV is leading HV with 30°

As far as I can tell, all correct answers given could have been found by following the link above.

DYN11 =

D= Primary wining is in Delta configuration

Y= Secondary winding is in Star configuration

N= With Neutral

11= The angle between primary and secondary winding, i.e Delta to Star= 30deg negative. If you see the clock that position the angle will show 11' O Clock

If it is Star to Delta, the angle will be 30 deg. positive = 1' O clock, then it will be YD1

Clear ???

thank you for the inviting

i tryed to open electricasl india magazine but it looks i am not sucsesful.

best regards

helal basho

Delta connected HV winding, star connected LV winding with neutral brought out, LV is leading HV with 30°

how about Ydy0?

There cannot be Ydy0; it should either be Yd1y0 or Yd11y0. It is a three winding transformer with HV Star connected; LV is Delta connected and there is an Intermediate Voltage Winding (a Tertiary Winding, perhaps) which is star connected. This transformer normally is an inter-connecting auto-transformer with a tertiary. Again such transformers are normally Star-Star & with a tertiary Delta. Can you please confirm this?

Sure, you are correct, it was my mistake. I wanted to ask the meaning of an LV interposing CT connection of Ydy0,0 for a differential protection scheme of a YNd1 transformer, the HV interposing CT connection is Yy0,0 and the phases have been physically transposed to give a 120degress phase shift ie the primary connections run as BRY and the corresponding secondary is RYB.