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4 Dyn11 Transformer nameplate, what does 4 stand for??
2

4 Dyn11 Transformer nameplate, what does 4 stand for??

4 Dyn11 Transformer nameplate, what does 4 stand for??

(OP)
4 Dyn11 Transformer nameplate, what does 4 stand for??

RE: 4 Dyn11 Transformer nameplate, what does 4 stand for??

In old British Standards for transformers,various connections were tabulated in tables.eg 0  connections were  in table 1, 11'o clock connections in table 4 etc.So when connection was mentioned, the table number also used to come with it.

RE: 4 Dyn11 Transformer nameplate, what does 4 stand for??

The transformer connections were listed by group numbers and these number referred to the phase displacements. These were:
Group 1(1)-zero degrees, clock hour number 0.
Group 11(2)- 180 degrees displacement, clock hour number 6.
Group 111(3)- minus 30 degrees disp., clock hour 1.
Group 1V(4)- plus 30 degrees, clock hour 11.

Here's an excellent resource.
J&P Transformer Book-A Practical Technology of the Power Transformer,Butterworth,numerous editions~$150.

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