Found a new transformer today. 480-208Y/120 with two sets of taps on the secondary, thirty degrees out of phase (0 degrees X1,120 X2,240 X3, XO then 30 X5,150 X6,270 X7, XO). Anyone seen this? From what I can figure it is supposed to cancel harmonics and reduce the need for an oversized neutral conductor. 1/0 with 3/0 neutral on the secondary, which differs from the size A mcm a,b,c size 2xA neutral for a K-rated transformer.
Anyone have an idea on how the coils are tapped? No namplate diagram.
(edited for coil question)
[This message has been edited by VAElec (edited 07-24-2006).]
