ABB RET 541 Product Manual page 24

24
Transformer Terminal
Directional earth-fault protection, high-set stage, DEF2High, I
instantaneous stage, DEF2Inst, I
Start current
Start voltage
Operate time
Operation mode
Operation criteria
Operation direction
Basic angle 
b
Operation characteristic
Intermittent E/F
Measuring mode
Drop-off time of the operate time counter
Operation accuracy
Start time, injected neutral current and
residual voltage
- internal time
- total time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
High-impedance based restricted earth-fault protection, REF1A, I
Basic setting; the lowest ratio of differential
and nominal current to cause a trip
Operation accuracy
Trip time
- injected currents
- internal time
- total time
Reset time
Reset ratio
Retardation time
RET 541, RET 543, RET 545
>>>
0
1.0...200.0% of In
2.0...100.0% of Un
0.1...300.0 s
Not in use
Definite time
Instantaneous
Basic angle & Uo
Basic angle
IoSin/Cos & Uo
IoSin/Cos
Non-directional Io
Non-directional Uo
Forward
Reverse
-90
-60
-30
0
IoSin()
IoCos()
Not active
Active
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
±2.5% of set value or + 0.01 x Un
Phase angle ±2
Injected neutral current >2.0 x start current
and residual voltage >2.0 x start voltage
<72 ms
<80 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.95
<50 ms
±2% of set value or ±20 ms
0.5...50%
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.004 x In
>2.0 x operating current:
<20 ms
<30 ms
60...1020 ms (depends on the minimum pulse width set for
the trip output)
0.80...0.98
This function block cannot be retarded but trips once the
current exceeds the operate value
1MRS755543
>> and
0
>
0