Woodward HighPROTEC - Page 826

Protective Elements
Generator
Directly cooled cylindrical
synchronous generator
Prime mover Steam turbine
Power rating (S
G
) 492 MVA
Rated Voltage (V
G
) 20 kV
Rated Current (I
G
) 14202 A
Power Factor (PF) 0.77
Rated Frequency (f
N
) 60 Hz
Rated Speed 3600 RPM
Direct axis synchronous reactance (X
d
) 1.1888 (pu)
Saturated direct axis transient reactance (X′
d
) 0.20577 (pu) = 3.61 Ω
Saturated direct axis sub-transient reactance (X″
d
) 0.17847 (pu)
Negative-sequence reactance (X
2
) 0.17676 (pu)
VT location Generator terminal
VT connection Y-ground
VT primary rated voltage 20000 V
VT secondary rated voltage 120 V
VT ratio 20000 / 120 = 166.67
CT Ntrl primary rated current 18000 A
CT Ntrl secondary rated current 5 A
CT Ntrl ratio 18000 / 5 = 3600
CT Mains primary rated current 18000 A
CT Mains secondary rated current 5 A
CT Mains ratio 18000 / 5 = 3600
Generator Neutral Grounding Transformer (NGT) 14400 V / 240 V / 120 V
NGT secondary resistance 1.25 Ω
826 MCDGV4 DOK-HB-MCDGV4-2E