VAMP 259 - Page 74

2.6 Overcurrent stage I> (50/51)
2 Protection functions
Technical description
74
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VM259.EN007
Figure 2.6-1 Block diagram of the three-phase overcurrent stage I>.
Figure 2.6-2 Block diagram of the three-phase overcurrent stage I>> and
I>>>.
Parameters of the overcurrent stage I> (50/51)
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. This flag is
automatically reset 5 minutes
after the last front panel push
button pressing.
Set