Operation Principle; Power Monitoring - ABB RELION 630 Series Technical Manual

1MRS757256 F
7.6.4
7.6.4.1
PML630/Compact Load-Shedding Solution
Technical Manual
calculates the active power, fast load-shedding trigger, fast load-shedding block and
compensated CB status. It has the provision to bypass the fast load-shedding block
caused by various conditions. It reports the load-shedding data and active power of
network circuit breaker to LSCACLS for load-shedding action.

Operation principle

The operation of NCBDCSWI can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
SND_CB_POWER
Power
RCV_CB_POWER
monitoring
SND_IED_TEST
RCV_IED_TEST
SND_IED_QVAL
RCV_IED_QVAL
SND_CB_SER
SND_CB_L_OUT
RCV_CB_SER
RCV_CB_L_OUT
SND_CB_POS
RCV_CB_POS
INHIBIT_TRG
GUID-B7741267-1F69-4FCB-A8D3-68C7DFB0717F V2 EN
Figure 140: Functional module diagram

Power monitoring

Based on the network circuit breaker configuration, NCBDCSWI can be configured
for a bus coupler or tie circuit breaker.
If one network circuit breaker is connected in a busbar configuration as shown in
Figure 141, the CB configuration setting is set to "Bus coupler".
If two network circuit breakers are connected in a busbar configuration as shown in
Figure 142, the CB configuration setting is set to "Tie breaker".
Power management functions
General
logic
Block
logic
Binary to
integer
Compensated
CB status
FLS
trigger
logic
Section 7
VIRTUAL_CB
B_SET_CHANGE
BLK_BYPASS
FLS_BLOCK
CB_POWER
NW_CB
NW_CB_DATA
CB_COMPS_POS
FLS_TRIGGER
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