ABB RET 545 - Page 24

Directional earth-fault protection, high-set stage, DEF2High, I
0
>> and
instantaneous stage, DEF2Inst, I
0
>>>
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
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
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
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
High-impedance based restricted earth-fault protection, REF1A, I
0
>
Basic setting; the lowest ratio of differential
and nominal current to cause a trip
0.5...50%
Operation accuracy
Trip time
- injected currents
- internal time
- total time
Reset time
Reset ratio
Retardation time
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
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
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