ABB REF601 Product Manual page 14

Feeder Protection
REF601
Product version: 2.0
Table 23. Low-set earth-fault protection, stage I
Parameter
Nominal value of earth current
Measurement range
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
IEC characteristics
RI characteristics
Reset ratio
Table 24. High-set earth-fault protection, stage I
Parameter
GUID-89A9F7DF-FB82-4E8D-B449-7C0BB51C1DCA V1 EN
Setting range of pick-up current 'I
Operation accuracy
Operation mode
Operate time delay (DMT) 't
Operation time accuracy
Reset ratio
14
> / 51N
o
Value (Range)
1 A
0.05...5 x I
n
>' External earth measurement : 0.05...0.1 x I
o
Internal earth measurement : 0.2...1.0 x I
External earth measurement :
Internal earth measurement :
>' 0.1...1.6 sec in steps of 0.1 for B=1
o
0.5...8.0 sec in steps of 0.5 for B=5
External earth measurement :
Internal earth measurement :
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
External earth measurement : class E(5) or
External earth measurement : class E(7.5) or
Internal earth measurement :
Internal earth measurement :
IDMT : 0.96 and DT : 0.98
>> / 50N
o
Value (Range)
>>' 0.5...4.0 x I in steps 0.25, infi nite
o n
External earth measurement :
Internal earth measurement :
Defi nite time
>>' 0.00...0.75 sec in steps of 0.05
o
External earth measurement :
Internal earth measurement :
For setting 0.00 msec : 45 msec
0.98
1MDB07207-YN
in steps 0.05, infi nite
n
in steps 0.05, infi nite
n
±
5.0% of set value
±
15.0% of set value
± ±
5.0% of set value or 30 msec
± ±
10.0% of set value or 30 msec
±
30 msec
±
30 msec
± ±
5.0% of set value or 30 msec
± ±
10.0% of set value or 30 msec
±
5.0% of set value
±
15.0% of set value
± ±
5.0% of set value or 30 msec
± ±
10.0% of set value or 30 msec
ABB