3.9 Combined overcurrent status
3 Supporting functions
Technical description
128
VAMP 24h support phone +358 (0)20 753 3264
VM59.EN001
Set = An editable parameter (password needed)
*) Used with IEC 60870-105-103 communication protocol. The alarm screen
will show the latest if it's the biggest registered fault current, too. Not used
with Spabus, because Spabus masters usually don't like to have unpaired
On/Off events.
**) Used with SPA-bus protocol, because most SPA-bus masters do need an
off-event for each corresponding on-event.
Figure 3-4 Combined o/c status.
The fault that can be seen in the Figure 3-4 was 3 times to
nominal and it started as an one phase fault L1-E. At the
moment when one of the protection stages tripped the fault was
already increased into a two phase short circuit L1-L2. All
signals which are stated as “1” are also activated in the output
matrix. After the fault disappears the activated signals will
release.
Combined overcurrent status can be found from VAMPSET
menu “Protection stage status 2”.
