ABB REG316 4 Series - Page 646

Numerical generator protection REG316*4
1MRK502004-Ben
Page 18
Technical Data Func-
tions (cont’d)
Technical Data Func-
tions (cont’d)
ABB Switzerland Ltd
Utility Automation
Table 19: Instantaneous overcurrent (50)
Features:
· Maximum or minimum function (over- and undercurrent)
· Single- or three-phase measurements
· Wide frequency range (0.04 to 1.2 f
N
)
· Peak value evaluation
Settings:
Current 0.1 to 20 I
N
in steps of 0.1 I
N
Delay 0 to 60 s in steps of 0.01 s
Accuracy of pick-up value (at 0.08 to 1.1 f
N
) ±5% or ±0.02 I
N
Reset ratio >90% (for max. function)
<110% (for min. function)
Max. trip time with no delay (at f
N
) £30 ms (for max. function)
£60 ms (for min. function)
Table 20: Voltage-controlled overcurrent (51-27)
Features:
· Maximum current value memorized after start
· Reset of function after voltage return or after trip
· Single- or three-phase measurement for current
·
Positive-sequence voltage evaluation
Settings:
Current 0.5 to 20 I
N
in steps of 0.1 I
N
Voltage 0.4 to 1.1 U
N
in steps of 0.01 U
N
Delay 0.5 to 60 s in steps of 0.01 s
Hold time 0.1 to 10 s in steps of 0.02 s
Accuracy of pick-up value ±5% (at f
N
)
Reset ratio >94%
Starting time £80 ms
Table 21: Inverse time-overcurrent function (51)
· Single or three-phase measurement with detection of the highest phase current
· Stable response to transients
Inverse time characteristic
(acc. to B.S. 142 with extended setting range)
normal inverse
very inverse
extremely inverse
long time inverse
t=k
1
/ ((I/I
B
)
C
-1)
c = 0.02
c = 1
c = 2
c = 1
or RXIDG characteristic t = 5.8 - 1.35 · In (I/I
B
)
Settings:
Number of phases 1 or 3
Base current I
B
0.04 to 2.5 I
N
in steps of 0.01 I
N
Pick-up current I
start
1 to 4 I
B
in steps of 0.01 I
B
Min. time setting t
min
0 to 10 s in steps of 0.1 s
k
1
setting 0.01 to 200 s in steps of 0.01 s
Accuracy classes for the operating time
according to BritishStandard 142
RXIDG characteristic
E 5.0
±4% (1 - I/80 I
B
)
Reset ratio >94 %