ABB REG316 4 Series Operating Instructions Manual page 650

ABB Switzerland Ltd
Utility Automation
Technical Data Func-
Technical Data Func-
tions (cont'd)
tions (cont'd)
Numerical generator protection
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
Time multiplier k
1
Factor k (pick-up)
2
t
min
t
max
t
reset
Accuracy of NPS current (I ) measurement
2
Starting time
Table 30: Frequency (81)
Features:
· Maximum or minimum function (over-, underfrequency)
· Minimum voltage blocking
Settings:
Frequency
Delay
Minimum voltage
Accuracy of pick-up value
Reset ratio
Starting time
0.5 to 2.5 I in steps of 0.01 I
N N
5 to 30 s in steps of 0.1 s
0.02 to 0.20 in steps of 0.01
1 to 120 s in steps of 0.1 s
500 to 2000 s in steps of 1 s
5 to 2000 s in steps of 1 s
±2% (at f ) with measuring transformers
N
£80 ms
40 to 65 Hz in steps of 0.01 Hz
0.1 to 60 s in steps of 0.01 s
0.2 to 0.8 U in steps of 0.1 U
N
±30 mHz at U and f
N N
100%
<130 ms
REG316*4
1MRK502004-Ben
Page 22
N