2.12 Directional earth fault protection
I0
φ
> (67N)
2 Protection functions
Technical description
66
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VM50.EN004
Figure 2.12-3. Two example of operation characteristics of the directional
earth fault stages in sector mode. The drawn I0 phasor in both figures is
inside the trip area. The angle offset and half sector size are user’s
parameters.
Parameters of the directional earth fault stages
I
0
>, I
0
>> (67N)
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
IoPeak
pu
The supervised value
according the parameter
"Input" below.
(I
0
> only)
IoRes
pu
Resistive part of I
0
(only when
"InUse"=Res)
IoCap
pu
Capacitive part of I
0
(only
when "InUse"=Cap)