ABB Relion 670 Series Product Manual page 100

Generator protection REG670
Version 2.2
Table 80. General current and voltage protection CVGAPC, continued
Function
Impulse margin time
Undervoltage:
Critical impulse time
Impulse margin time
Table 81. Rotor earth fault protection based on General current and voltage protection (CVGAPC) and RXTTE4
Function
For machines with:
• rated field voltage up to
• static exciter with rated
supply voltage up to
Supply voltage 120 or 230 V
Operate earth fault resistance
value
Influence of harmonics in the
DC field voltage
Permitted leakage capacitance
Permitted shaft earthing
resistance
Protective resistor
100
Range or value
15 ms typically
10 ms typically at 1.2 x U
U
set
15 ms typically
SEMOD175176-2 v5
Range or value
350 V DC
700 V 50/60 Hz
50/60 Hz
Approx. 1–20 kΩ
Negligible influence of 50 V,
150 Hz or 50 V, 300 Hz
(1–5) μF
Maximum 200 Ω
220 Ω, 100 W, plate
(the height is 160 mm (6,2
inches) and width 135 mm (5,31
inches))
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Accuracy
-
to 0.8 x -
set
-
1MRK 502 074-BEN M
Hitachi Power Grids