ABB REG316 4 Series Operating Instructions Manual page 651

ABB Switzerland Ltd
Utility Automation
Numerical generator protection
Table 31: Rate-of-change of frequency df/dt (81)
Features:
· Combined pick-up with frequency criterion possible
· Blocking by undervoltage
Settings:
df/dt
Frequency
Delay
Minimum voltage
Accuracy of df/dt (at 0.9 to 1.05 f
Accuracy of frequency (at 0.9 to 1.05 f
Reset ratio df/dt
Table 32: Overexcitation (24)
Features:
· U/f measurement
· Minimum voltage blocking
Settings:
Pick-up value
Delay
Frequency range
Accuracy (at f )
N
Reset ratio
Starting time
Table 33: Overexcitation function with inverse time delay (24)
Features:
· Single-phase measurement
· Inverse time delay according to IEEE Guide C37.91-1985
· Setting made by help of table settings
Settings:
Table settings
Start value U/f
t
min
t
max
Reset time
Reference voltage
Accuracy of pick-up value
Frequency range
Reset ratio
Starting time
-10 to +10 Hz/s in steps of 0.1 Hz/s
40 to 55 Hz in steps of 0.01 Hz at f
50 to 65 Hz in steps of 0.01 Hz at f
0.1 to 60 s in steps of 0.01 s
0.2 to 0.8 U
N
) ±0.1 Hz/s
N
) ±30 mHz
N
95% for max. function
105% for min. function
0.2 to 2 U /f in steps of 0.01 U
N N
0.1 to 60 s in steps of 0.01 s
0.5 to 1.2 f
N
±3% or ±0.01 U
N
>97% (max.), <103% (min.)
£120 ms
U/f values: (1.05; 1.10 to 1.50) U
1.05 to 1.20 U /f
N
0.01 to 2 min in steps of 0.01 min
5 to 100 min in steps of 0.1 min
0.2 to 100 min in steps of 0.1 min
0.8 to 1.2 U in steps of 0.01 U
N
±3% U /f (at f
N N N
0.5 to 1.2 f
N
100%
<120 ms
REG316*4
1MRK502004-Ben
= 50 Hz
N
= 60 Hz
N
in steps of 0.1 U
N
/f
N N
/f
N
/f
N N
in steps of 0.01 U /f
N N N
N
)
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