2.13 Earth fault protection I0>
(50N/51N)
2 Protection functions Technical description
72
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Parameter Value Unit Description Note
k>
Inverse delay multiplier (for
inverse time only)
Set
Input Io1
IoCalc
Io1Peak
X1-7,8,9. See chapter 8.
IL1 + IL2 + IL3
X1-7,8,9. peak mode
Set
Intrmt s Intermittent time Set
Dly20x s Delay at 20xIon
Dly4x s Delay at 4xIon
Dly2x s Delay at 2xIon
Dly1x s Delay at 1xIon
A, B, C, D,
E
User’s constants for standard
equations. Type=Parameters.
See chapter 2.23.
Set
For details of setting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Parameters of the undirectional earth fault stages
I
0
>>, I
0
>>>, I
0
>>>> (50N/51N)
Parameter Value Unit Description Note
Status -
Blocked
Start
Trip
Current status of the stage
F
F
TripTime s Estimated time to trip
SCntr Cumulative start counter Clr
TCntr Cumulative trip counter Clr
SetGrp 1 or 2 Active setting group Set
SgrpDI
-
Dix
Vix
LEDx
Vox
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Set
Force Off
On
Force flag for status forcing
for test purposes. This is a
common flag for all stages and
output relays, too.
Automatically reset by a 5-
minute timeout.
Set
Io
IoCalc
pu
The supervised value
according the parameter
“Input” below.
Io>>
Io>>>
Io>>>>
A
Pick-up value scaled to
primary value
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