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Re: 12740Y/7200



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