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priority or inhibit status and power value of each sheddable load is reported to
LSCACLS for load-shedding action.
7.5.4
Operation principle
The operation of LDMMXU can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
BB
Compensated
CB status
B_SET_CHANGE
L1_CB_COMPS
L2_POWER
PRIO_L1_5
PRIO_L6_10
POWER_L1
IED_TEST_L1
EXT_INH_L1
CB_POS_L1
IED_QVAL_L1
Power
monitoring
Shed priority
logic
Load
inhibit
logic
POWER_L2
POWER_L10
§
§
§
L1_POWER
L10_POWER
§
§
§
CB_POS_L2
CB_POS_L10
§
§
§
IED_QVAL_L2
IED_QVAL_L10
§
§
§
IED_TEST_L2
§
§
§
IED_TEST_L10
EXT_INH_L2
EXT_INH_L10
§
§
§
L2_CB_COMPS
L10_CB_COMPS
§
§
§
GUID-ECECA829-6E15-4C50-99FC-8728782F466E V2 EN
Figure 138:
Functional module diagram
The Power monitoring, Compensated CB status and Load inhibit logic modules are
identical for sheddable load1 to sheddable load10. Hence, the logic explained in these
modules for sheddable load1 also applies to sheddable load2, sheddable load3 and so
on.
7.5.4.1
Power monitoring
This module converts the units of the
POWER_L1
input (sheddable load1 active
power) in kW as the
Power convention L1
setting. The
L1_POWER
output is provided
for monitoring view.
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution
237
Technical Manual
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