ABB RET 541 Product Manual page 22

22
Transformer Terminal
Non-directional earth-fault protection, low-set stage, NEF1Low, I
Start current
Operate time at DT mode
Time multiplier at IDMT mode
Operation mode
Measuring mode
Drop-off time of the operate time counter
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
Non-directional earth-fault protection, high-set stage, NEF1High, I
instantaneous stage, NEF1Inst, I
Start current
Operate time
Operation mode
Measuring mode
Drop-off time of the operate time counter
Operation accuracy
Start time:
- Injected currents
- internal time
- total time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
RET 541, RET 543, RET 545
1.0...100.0% of In
0.05...300.00 s
0.05...1.00
Not in use
Definite time
Extremely inverse
Very inverse
Normal inverse
Long time inverse
RI-type inverse
RD-type inverse
IEEE curves
Peak-to-peak
Fundamental frequency
0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value + 0.0005 x In
>2.0 x start current:
<32 ms
<40 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
>>>
0
0.10...12.00 x In
0.05...300.00 s
Not in use
Definite time
Instantaneous
Peak-to-peak
Fundamental frequency
0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or + 0.01 x In
>2.0 x start current
<32 ms
<40 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
1MRS755543
>
0
>>, and
0