Numerical generator protection REG316*4
1MRK502004-Ben
Page 22
Technical Data Func-
tions (cont’d)
Technical Data Func-
tions (cont’d)
ABB Switzerland Ltd
Utility Automation
Table 30: Frequency (81)
Table 29: Inverse time negative phase sequence current (46)
Features:
· Protection against unbalanced load
· Inverse time delay
· Three-phase measurement
Fig. 9 Inverse time negative phase
sequence current 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
5 to 30 s in steps of 0.1 s
Factor k
2
(pick-up) 0.02 to 0.20 in steps of 0.01
t
min
1 to 120 s in steps of 0.1 s
t
max
500 to 2000 s in steps of 1 s
t
reset
5 to 2000 s in steps of 1 s
Accuracy of NPS current (I
2
) measurement ±2% (at f
N
) with measuring transformers
Starting time £80 ms
Features:
· Maximum or minimum function (over-, underfrequency)
· Minimum voltage blocking
Settings:
Frequency 40 to 65 Hz in steps of 0.01 Hz
Delay 0.1 to 60 s in steps of 0.01 s
Minimum voltage 0.2 to 0.8 U
N
in steps of 0.1 U
N
Accuracy of pick-up value ±30 mHz at U
N
and f
N
Reset ratio 100%
Starting time <130 ms
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