ABB RELION REX640 Technical Manual page 1458

Section 9
Control functions
1452
Source
Source CB
ISO A
Bus A
Single busbar arrangement
GUID-6023C03C-16A4-415D-B001-2EEFBAC284B7 V1 EN
Figure 781: Different busbar arrangement for any source CB
The subnetwork group identification is based on the set busbar arrangement across
each CB and the connection status input received from the corresponding ASGCSYN
via SRC1_ASC_DAT...SRC8_ASC_DAT or from the corresponding ASNSCSYN
via signals NS1_ASC_DAT...NS17_ASC_DAT.
An example of the subnetwork group identification is shown in
NSCB 2 connects bus bar 1 and bus bar 2, then setting NonSrc2 bus A1 Num is set to
"Bus 1" and NonSrc2 bus A2 Num is set as "Bus 2". Based on the bus connection status
received via the input NS2_ASC_DAT, this module determines that Bus 1, Bus 2 and
NSCB 2 are electrically connected. Similarly for SCB 2, Src2 bus A Num is set as "Bus
2" and the source CB closed status input is received via SRC1_ASC_DAT. So SCB 2
is electrically connected to Bus 2. Hence it is determined that SCB 2, Bus 2, Bus 1 and
NSCB 2 are electrically connected to each other.
Two subnetworks are identified in
NSCB 1, NSCB 2, SCB 2 and source 2. The second comprises Bus 3, Bus 4, NSCB
4, SCB 3 and source 3. Each network group is assigned a subnetwork number which
is the lowest bus bar number in the subgroup. Hence the first group is assigned
subnetwork number 1 and the second group is assigned subnetwork number 3.
Source CB
ISO A
Bus A
Double busbar arrangement
Figure 782. The first comprises Bus 1, Bus 2,
1MRS759142 C
Source
ISO B
Bus B
Figure 782. Since
REX640
Technical Manual