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