Protection Functions - ABB REF601 Product Manual

Feeder Protection
REF601
Product version: 2.0

17. Protection functions

Table 20. Low-set phase overcurrent protection, stage I> / 51
Parameter
Setting range of pick-up current 'I >'
Operation accuracy
Operate time delay (DMT) 't >'
Operation time accuracy
Operating curve type
Time multiplier setting 'k'
Operation time accuracy
IEC characteristics
RI characteristics
Reset ratio
Table 21. High-set phase overcurrent protection, stage I>> / 50-1
Parameter
Setting range of pick-up current 'I >>'
Operation accuracy
Operation mode
Operate time delay (DMT) 't >>'
Operation time accuracy
Reset ratio
Table 22. Very High-set phase overcurrent protection, stage I>>> / 50-2
Parameter
Setting range of pick-up current 'I >>>'
Operation accuracy
Operation mode
Operate time 't >>>'
Operation time accuracy
Reset ratio
ABB
Value (Range)
0.2...1.0 x I in steps 0.025, infinite
n
±
5.0% of set value
0.1...1.6 sec in steps of 0.1 for B=1
0.5...8.0 sec in steps of 0.5 for B=5
± 5.0% of set value or ± 30 msec
IEC 60255-3:
Normal inverse, Very inverse, Extremely inverse, Long-time inverse
Special curves:
RI inverse
0.1...1.6, in steps of 0.1
±
class E(5) or 30 msec
± 5.0% of set value or ± 30 msec
IDMT : 0.96 and DT : 0.98
Value (Range)
1.0...2.75 x I in steps 0.25, infinite
n
±
5.0% of set value
Definite time
0.1...0.45 sec in steps of 0.05
± ±
5.0% of set value or 30 msec
0.98
Value (Range)
2.0...15.0 x I in steps 1.0, infinite
n
±
5.0% of set value
Instantaneous
0.05 sec
±
15 msec
0.98
1MDB07207-YN
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