ABB REF 541 Product Manual page 32

32
Feeder Terminal
Current unbalance protection for shunt capacitor banks, CUB1Cap, dI>C (51NC-1)
Operation mode
Alarm mode
Start current of the tripping stage
Operate time of the tripping stage in DT mode
Time multiplier k for the tripping stage in
IDMT mode
Start current of the alarm stage
Operate time of the alarm stage
Disallowed number of faulty elements
Level of natural unbalance compensation
Recording of the natural unbalance phasor
Location of capacitor fuses
Faulty elements counter
Amount of faulty elements in branch 1 of
phase IL1
Amount of faulty elements in branch 2 of
phase IL1
Amount of faulty elements in branch 1 of
phase IL2
Amount of faulty elements in branch 2 of
phase IL2
Amount of faulty elements in branch 1 of
phase IL3
Amount of faulty elements in branch 2 of
phase IL3
Operation accuracies
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at definite-time mode
Operate time accuracy at inverse-time mode
REF 541, REF 543, REF 545.
Not in use; Definite time; Extremely inv.; Very inv.;
Normal inv.; Long-time inv.; RI-type inv.; RD-type inv.
Normal mode; Element counter
1.0...100.0%dIn
1.0...300 s
0.05...2.0
1.0...100.0%dIn
1.0...300 s
1...100
0.0...20.0%dIn
Do not activate; Activate
External; Internal
0...100
0...100
0...100
0...100
0...100
0...100
Note! The values below apply when f/f
2.5% of set value + 0.001 x dI
Phase angle measurement: 2
Injected currents = 2.0 x start current
internal time <32 ms
total time <40 ms
40...1000 ms (depends on the minimum pulse width set for
the TRIP output)
Typ. 0.95
< 45 ms
2% of set value or 20 ms
Class index E = 5.0 or 20 ms
1MRS750443-MBG
=0.95...1.05
n
n