2.13 Earth fault protection I0>
(50N/51N)
2 Protection functions
Technical description
72
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VM50.EN004
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