ABB REJ601 - Page 16

Feeder protection and control / Feeder protection
1MDB07221-YN
REF601 / REJ601
Product version: 2.2 FP2
Issued: 2017-05-09
Revision: A
16 ABB
Table 28. Transformer inrush detection, 3I2f> / 68
Parameter
Value (Range)
Inrush threshold value
0.5...25 x In, in steps of 0.01
Ratio Setting
30%...50%, in steps of 5%
Table 29. Thermal overload protection, 3Ith> / 49
Parameter
Value (Range)
Initial thermal level of apparatus 0
0.0…100%, in steps of 1%
Reference current leading to thermal
calculation “Ib”
0.1 … 1.5 x In, in steps of 0.1
Heating time constant of object ‘𝜏′
1.0…300 min, in steps of 1.0
Cooling time constant of object ‘𝜏
↓𝑠
‘
1.0…300 min, in steps of 1.0
Alarm value, alm
50…200%, in steps of 1%
Operate value, trip
50…200%, in steps of 1%
Start inhibit value, startinhibit
50…200%, in steps of 1%
Options for calculating thermal value
during power interruption, powerOFF
1…4¹)
Operation time accuracy
3% of 5time constant or ± 30s
Reset ratio
0.98
¹
)
Options for calculating thermal image during power interruption shall be as below
1 = On restoration of power, new value of current after power on will be considered to calculate new value of
thermal image for interruption period Δt.
2 = On restoration of power, new value of thermal image is calculated for interruption period Δt considering that
current has remained constant value during power interruption.
3 = Power interruption of the IED assumes no change of thermal image during interruption period.
4 = Power interruption of the IED resets the thermal image to the set value defined by setting 
0
.
Table 30. Phase discontinuity protection, I2/I1> / 46PD
Parameter
Value (Range)
Start value, ‘I2/I1>”
10…100%, in steps of 1%
Operate delay time, ‘tI2/I1>’
0.04… 64 s, in steps of 0.1
Block the phase discontinuity protection
0 = No, 1 = Yes
Operation accuracy
± 5.0% of set value
Operation time accuracy
3% of set or ± 30 ms
Reset ratio
0.98