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

Section 7
Power management functions
7.4.4
7.4.4.1
216

Operation principle

The operation of PSCSWI can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
POWER
MAX_POWER
Power
GOVERNOR_MOD monitoring
AP_GOV_QVAL
ISLAND_PARAL
IED_TST_MODE
CB_IED_QVAL Block logic
CB_POSITION
CB_SERVICE
Compensated
CB_LOCK_OUT CB status
INHIBIT_TRG
SLS_DISABLE
I_A
I_B
I_C
ENA_MULT
EXT_OC_SLST
RESET_OC
RESET_DEMAND
GUID-7C8DC2A9-1499-42BF-96CB-2E6F168C6B33 V1 EN
Figure 131: Functional module diagram

Power monitoring

This module calculates the available power and active power of the power source. It
also calculates the governor mode of the generator.
The units of the POWER and MAX_POWER inputs can be W, kW or MW. This module
converts the units of the POWER and MAX_POWER inputs in kW as the Power
convention setting.
The POWER and MAX_POWER inputs must have the same unit.
General
logic
Fast load
shed
trigger
logic
Slow load
shed logic
Over
current
based load
shed
Demand
based load
shed
PML630/Compact Load-Shedding Solution
1MRS757256 F
FLS_BLOCK
B_SET_CHANGE
CB_COMPS_POS
BLK_BYPASS
ISLND_PARALL
GOV_MODE
AVA_POWER
SOURCE
OVLOD_AMOUNT
ACTIVE_POWER
DATA_SOURCE
BB_NUMBER
FLS_TRIGGER
Binary to
integer
SLOWLS_OPR
OC_STR
OC_OPR
MAX_CURRENT INVAL_CRV
MAX_DMD_ALM
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