ABSTRACT
The voltage rating of the transformer is specified in terms of both the lineto-line system voltages and the winding voltages. For example, a 230 kV Grd.Y to 69 kV Grd.Y transformer with a 12.47 kV tertiary would have the following voltage rating on its nameplate:
230000GR.Y/132800-69000GR.Y/39840-12470
The hyphens separate the voltage ratings of one winding from the voltage ratings of the other windings. In this illustration, 230000GR.Y/132800 is the rating of the high-voltage winding, 69000GR.Y/39840 is the rating of the lowvoltage winding, and 12470 is the rating of the tertiary winding. The voltage ratings are always given in volts.
