ABB REG316 4 Series - Page 649

Numerical generator protection
ABB Switzerland Ltd
Utility Automation
REG316*4
1MRK502004-Ben
Page 21
Table 27: Stator overload (49S)
Table 28: Rotor overload (49R)
Features:
· Single- or three-phase measurement
· Operating characteristics according to ASA-C50.13
· Highest phase value for three-phase measurement
· Wide time multiplier setting.
Fig. 8 Stator overload protection function
characteristics
Settings:
Base current (I
B
) 0.5 to 2.5 I
N
in steps of 0.01 I
N
Time multiplier k
1
1 to 50 s in steps of 0.1 s
Pick-up current (I
start
) 1.0 to 1.6 I
B
in steps of 0.01 I
B
t
min
1 to 120 s in steps of 0.1 s
t
g
10 to 2000 s in steps of 10 s
t
max
100 to 2000 s in steps of 10 s
t
reset
10 to 2000 s in steps of 10 s
Accuracy of current measurement ±5% (at f
N
), ±2% (at f
N
) with measuring transformer
Starting time £80 ms
Features:
Same as stator overload function, but three-phase measurement
Settings:
Same as for stator overload function