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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.
7.6.4
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.
CB_COMPS_POS
SND_IED_QVAL
RCV_CB_POWER
Block
logic
RCV_IED_QVAL
SND_CB_POWER
FLS
trigger
logic
SND_CB_POS
RCV_CB_POS
SND_CB_SER
SND_CB_L_OUT
RCV_CB_SER
RCV_CB_L_OUT
Compensated
CB status
RCV_IED_TEST
SND_IED_TEST
CB_POWER
Power
monitoring
INHIBIT_TRG
NW_CB_DATA
B_SET_CHANGE
BLK_BYPASS
FLS_BLOCK
FLS_TRIGGER
NW_CB
VIRTUAL_CB
Binary to
integer
General
logic
GUID-B7741267-1F69-4FCB-A8D3-68C7DFB0717F V2 EN
Figure 140:
Functional module diagram
7.6.4.1
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
, the
CB configuration
setting is set to “Bus coupler”.
If two network circuit breakers are connected in a busbar configuration as shown in
, the
CB configuration
setting is set to “Tie breaker”.
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution
249
Technical Manual
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