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