ABB REF 541 Product Manual page 33

Feeder Terminal
Three-phase current unbalance protection for H-bridge connected shunt capacitor banks,
CUB3Cap, 3dI>C (51NC-2)
Operation 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
Comp natural dI1
Comp natural dI2
Comp natural dI3
Rec natural dI
Operation accuracies
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at definite-time mode
Operate time accuracy at inverse-time mode
Auto-reclosure function, AR5Func, O  I (79)
Number of reclosures
Initiation mode
AR1, AR2, AR3, AR4 starting line operation
mode
AR1 AR2, AR3, AR4 start delay
Dead time
Synchro-check
Discriminating time td
Operation accuracy
Synchro-check/voltage check function stage 1 and stage 2, SCVCSt1 & SCVCSt2, SYNC1, SYNC2
(25-1, 25-2)
Upper threshold voltage Umax
Lower threshold voltage Umin
Voltage difference U
Phase angle difference phase
Frequency difference f
Operation accuracy
Reset time
Reset ratio
Operate time accuracy
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.
1.0...100.0% dIn
1.0...300 s
0.05...2.0
1.0...100.0% dIn
1.0...300.0 s
0.0...20.0% dIn
0.0...20.0% dIn
0.0...20.0% dIn
Do not activate; Rec all phasors; Rec phasor dI1, Rec
phasor dI2, Rec phasor dL3
Note! The values below apply when f/f
2.5% of set value + 0.0005 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)
0.95
< 45 ms
2.5% of set value or 0.1% dIn
2.5% of set value or 0.1% dIn
0...5
Trip
Start
No operation
AR shot initiated
Initiation of AR shot blocked
0...10.00 s
0.20...300.00 s
Not in use; ARSYNC in use
0...30.00 s
±1% of setting value or ±30 ms
0.50...1.00 x Un
0.10...0.80 x Un
0.02...0.60 x Un
5...90
0.02...5.00 Hz
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.01 x Un
±10 mHz
±2
< 50 ms
0.975 x Un
±2% of set value or ±20 ms
1MRS750443-MBG
=0.95...1.05
n
n
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