Table 78. General current and voltage protection CVGAPC , continued
Function
Range or value
Accuracy
Undervoltage:
Critical impulse time
10 ms typically at 1.2 x U
set
to 0.8 x
U
set
-
Impulse margin time
15 ms typically
-
SEMOD175176-2 v5
Table 79. Rotor earth fault protection based on General current and voltage protection (CVGAPC) and RXTTE4
Function
Range or value
For machines with:
• rated field voltage up to
350 V DC
• static exciter with rated supply
voltage up to
700 V 50/60 Hz
Supply voltage 120 or 230 V
50/60 Hz
Operate earth fault resistance
value
Approx. 1–20 kΩ
Influence of harmonics in the DC
field voltage
Negligible influence of 50 V, 150
Hz or 50 V, 300 Hz
Permitted leakage capacitance
(1–5) μF
Permitted shaft earthing
resistance
Maximum 200 Ω
Protective resistor
220 Ω, 100 W, plate
(the height is 160 mm (6,2
inches) and width 135 mm (5,31
inches))
1MRK 502 074-BEN A
Generator protection REG670 2.2 and Injection equipment REX060,
REX061, REX062
Product version: 2.2.1
ABB
89
