Technical description
2 Protection functions
2.8 Earth fault protection I0>
(50N/51N)
VM59.EN001
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67
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
Fx
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Function key
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
Io>>
Io>>>
Io>>>>
pu
Pick-up setting relative to the
parameter "Input" and the
corresponding CT value
Set
t>
s
Definite operation time (for
definite time only)
Set
Input
Io1
IoCalc
X1-7,8,9. See chapter 8.
IL1 + IL2 + IL3
Set
For details of setting ranges see chapter 9.2.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Recorded values of the latest eight faults
There is detailed information available of the eight latest earth
faults: Time stamp, fault current, elapsed delay and setting
group.
