ABB REF601 Product Manual - page 10
ABB
10
Feeder Protection
REF601 IEC
Product Version: 1.0
Non-directional earth-fault protection
Low-set stage Io >
Nominal value of earth current
1 A
Measurement range
0.05...5 x In
Setting range for External earth
fault measurement
0.05...1 x In in step of 0.05, infinite
Setting range for Internal earth
fault measurement
0.20...1 x In in step of 0.05, infinite
Setting range of time multipler
‘ k ‘
0.1...1.6, in step of 0.1
Operate time at DT mode to >
0.1...1.6 sec insteps of 0.1 for B=1
0.5...8.0 sec insteps of 0.5 for B=5
Inverse time characteristics
IEC 60255-3:
Normal inverse, Extremely inverse,
Very inverse, Long time inverse
Special curves:
RI inverse time
Accuracy of pick-up current
± 5% of set value for ext. measurement
± 15% of set value for int. measurement
Accuracy of operate time :
DMT and RI characteristic
IDMT characteristic
DMT and RI characteristic
IDMT characteristic
For external measurement
± 5% of set value or ± 30 msec
class E(5) or ± 30 msec
For internal measurement
± 10% of set value or ± 30 msec
class E(7.5) or ± 30 msec
Reset ratio
IDMT : 0.96 and DMT : 0.98
High-set stage
Io >>
Setting range
0.5...4.0 x In in step of 0.25, infinite
Operation mode
Definite time
Operate time to >>
0.00...0.75 in step of 0.05
Accuracy of pick-up current
± 5% of set value for ext. measurement
± 15% of set value for int. measurement
Accuracy of operate time
± 5% of set value or ± 30 msec
for int. measurement,
± 10% of set value or ± 30 msec
for ext. measurement
Note : 45 msec for setting of 0.00 msec
Reset ratio
0.98
Transformer inrush detection
Inrush threshold value
0.2...20 x In
Ratio Setting
30%...50%