VAMP 52 - Page 66

2.12 Directional earth fault protection
I0φ> (67N)
2 Protection functions Technical description
66
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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)