ABB RET 545 - Page 20

Three-phase directional overcurrent function, low-set stage, DOC6Low, I>
Operation mode
Start current
Operate time
Time multiplier
Basic angle 
b
Operation direction
Earth-fault protection
Measuring mode
Drop-off time of the operate time counter
Not in use
Definite time
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
RI-type inverse
RD-type inverse
0.05…40.00 x In
0.05…300.00 s
0.05…1.00
0…90
Forward
Reverse
Disabled
Enabled
Phase-to-phase voltages, peak-to-peak measurement
Phase-to-phase voltages, fundamental freq. measurement
Phase-to-earth voltages, peak-to-peak measurement
Phase-to-earth voltages, fundamental freq. measurement
0...1000 ms
Operation accuracy
Start time:
- injected currents
- internal time
- total time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
Accuracy class index E at IDMT mode
Note! The values below apply when f/fn = 0.95...1.05
0.1...10 x In: ±2.5% of set value or ±0.01 x In
10...40 x In: ±5.0% of set value
±2.5% of measured voltage or ±0.01 x Un
±2
>2.0 x start current:
<42 ms
<50 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.95
< 45 ms
±2% of set value or ±20 ms
Class index E = 5.0 or ±20 ms
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
20
Three-phase directional overcurrent function, high-set stageDOC6High, I>>and instantaneous
stageDOC6Inst, I>>>
Operation mode
Start current
Operate time
Basic angle 
b
Operation direction
Earth-fault protection
Non-directional operation (when the direction
cannot be determined)
Measuring mode
Drop-off time of the operate time counter
Not in use
Definite time
Instantaneous
0.05…40.00 x In
0.05…300.00 s
0…90
Forward
Reverse
Disabled
Enabled
Disabled
Enabled
Phase-to-phase voltages, peak-to-peak measurement
Phase-to-phase voltages, fundamental freq. measurement
Phase-to-earth voltages, peak-to-peak measurement
Phase-to-earth voltages, fundamental freq. measurement
0...1000 ms