ABB RELION 630 Series Technical Manual page 286

Section 7
Power management functions
280
This module receives the compensated circuit breaker status of network CB
(i = 1 to 5 and j = 2 to 6 ∀ i<j) from the respective NCBDCSWI
COMP_STS_CB
ij
function.
The module identifies group of various busbars connected together and calculates the
subnetwork number. The subnetwork number of the group is same as the lowest
busbar number in the group. The power sources, network circuit breakers and busbars
in the group are assigned the same subnetwork number.
The subnetwork is active if minimum one compensated circuit breaker status of power
source is TRUE, else subnetwork is inactive. If subnetwork is inactive, the
subnetwork number of the group is zero.
As power sources can be configured in the busbar 1, busbar 2, busbar
3 or busbar 4, the module can determine a maximum of four
subnetworks, that is, subnetwork 1, subnetwork 2, subnetwork 3 and
subnetwork 4.
The subnetwork numbers of eight power sources are provided by outputs
SRC1_SN_NO...SRC8_SN_NO. The subnetwork numbers of 15 network circuit
breakers are provided by outputs CB12_SN_NO...CB56_SN_NO. The subnetwork
numbers of six busbars are provided by outputs BB1_SN_NO...BB6_SN_NO.
These data are available in the monitoring data view.
If the compensated circuit breaker status of the network circuit
breaker is FALSE (OPEN), the subnetwork number of the respective
network circuit breaker is zero.
The module determines the various active subnetworks and the subnetwork number of
power sources, network circuit breakers and busbars as explained in the example
below.
Subnetwork number=1
Power source1
Busbar=1
CB13 Power source3
Busbar=3
GUID-DAEF2C92-1C86-4DC3-BDFC-0EA8577530BE V1 EN
Figure 151: Subnetwork determination scenario
Subnetwork number=2
Power source2
CB12
Busbar=2
CB24
Power source4
Busbar=4
CB34
PML630/Compact Load-Shedding Solution
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Technical Manual