Siemens SIPROTEC 4 7UT6 Series Manual page 527

[wdl-fo-in-tabelle, 1, en_GB]
with:
c = voltage factor (for generators: 1.1)
S = nominal power of the transformer in kVA
NT
U = nominal voltage of the transformer in kV
NT
S = nominal power of the generator in kVA
NG
U = nominal voltage of the generator in kV
NG
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Current Transformer Requirements
D.1 General Requirements
527