Re: 12740Y/7200

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Hi Chip,

We'll see if I learned this correctly.  The 7200 means the voltage 
across the HV bushings.  The 12740Y means the voltage from one Y leg 
to the next Y leg.  If you assume each Y leg (from the center) is 
7200V and each leg is 120 degrees phase different from the other two 
legs, the math comes out to 12740V from leg to leg.  My PIG is marked 
14400/24940Y for the HV side.
You may want to check your name plate again as I suspect the 12740 is 
really 12470.

Gerry R"

   I'd think that was a Y-connected transformer, 7200 volts line to 
neutral, 12470 (sqrt(3)*7200) line to line.  Assume case is neutral but?

Ed