3ph transformer with 2 coils? 1

[rocastro25]

Somebody can explain me how the transformer diagram shown in the file attached works as an Delta-wye transformer? for me, it is a T-T conection, but if somebody can help me to understand if this kind of conections can eliminate the third harmonic voltages by the circulation of the harmonic current trapped in the primary "Delta winding", please let me know!!!..I don't see a Delta in the primary! :-(

Thanks!

 

[7anoter4]

Since the System [Grid] supplies only three phases without Neutral the primary winding voltages are as in Delta connection.
The secondary windings f.e.m.[Esec-produced voltages] are in the same phase as primary windings. I noted the middle point of X2-X3 secondary winding as "Middle".
The voltage between X3 and Middle is k23*E2_3 [k23 could be 1/2 or else].
Voltage between Xo-Middle is k10*E1_0. The voltage between X3 and Xo is the vectorial sum of E(xo-middle) and E(x3-middle)[the diagonal of the triangle].
The same thing will be in the X2 side.
Choosing the right k10, k23 you could produce X1-Xo, X2-Xo, X3-Xo as symmetrical 3 phases with neutral voltages as in an actual star connection. See the attachment.

 

[Skogsgurra]

You deserve a double PLS!

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[7anoter4]

Thank you, Skogsgurra for your kind appreciation.

 

[WoodrowJWeen]

Never been a big fan of T-T transformers for 3ph loads because of the voltage unbalance.