ABB RELION REX640 Technical Manual page 1464

Section 9
Control functions
1458
When AS_CONFLICT is TRUE, then the Coordinator module stops the ongoing
coordination activities till a new synchronization request is received from any NSCB.
This conflict status is available in the monitored data CONFL_STATUS as given in
Table 1388.
Table 1388: States of CONFL_STATUS
Monitored data
CONFL_STATUS
Source Selection Logic
Source selection logic is responsible for the selection and coordination of the sources
for the voltage and frequency matching. It is enabled only when the
autosynchronization function of the selected NSCB is in "Semiautomatic" or
"Automatic" mode.
A source is available for participation in the voltage and frequency matching if the
corresponding autosynchronization function is in "Semi-automatic" or "Automatic"
mode and the host protection relay is in remote mode. This information is received
from the corresponding source via input signals
SRC1_ASC_DAT...SRC8_ASC_DAT.
All the sources in the network can be divided into nine participation groups based on
topology and their availability for participation.
Table 1389: Groups for source participation (monitored data
SRC1_PTC_GRP...SRC8_PTC_GRP)
Source participation group
Group 1
Group 2
Group 3
Group 4
Group 5
Table continues on next page
Value
1("No conflict")
2("Multiple NSCB sync")
3("Multiple SCB sync")
4("NSCB and SCB sync")
Description
All the sources which are unavailable for
participation, are electrically connected to the grid
or are not part of either subnetwork which must be
synchronized by the selected CB
The sources which do not belong to Group 1 and
are part of the subnetwork which includes the
lower-number busbar of the two busbars
connected across the selected CB
The sources which do not belong to Group 1 and
are part of the other subnetwork, which includes
the higher-number busbar.
The sources in Group 2 which are not ready for
participation in matching
The sources which are part of Group 3, but not
ready for participation in matching.
1MRS759142 C
REX640
Technical Manual