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7.3
Load-shedding functions
7.3.1
Power source circuit breaker function PSCSWI
•
PSCSWI can be configured for generator/external source.
•
PSCSWI receives the circuit breaker position, island and parallel information of
external source, governor mode of generator source and power values of power
source.
•
PSCSWI calculates the available power, amount of overload, compensated
circuit breaker status, fast load-shedding trigger, demand- or overcurrent-based
slow load-shedding trigger, island or parallel mode for generator source, load-
shedding blocking and load-shedding block override signals.
•
The governor mode of the generator and the available power of the power source
can be the setting or the communicated inputs received from the external IED via
IEC 61850 GOOSE.
7.3.2
Load busbar monitoring function LDMMXU
•
LDMMXU receives the circuit breaker position and the power values of the
sheddable loads connected on same busbar.
•
LDMMXU calculates the shedding priority, operator inhibitions or system
inhibition for each sheddable loads.
7.3.3
Network circuit breaker function NCBDCSWI
•
NCBDCSWI can be configured for tie circuit breaker or bus coupler.
•
NCBDCSWI receives the circuit breaker position and the power values of
network circuit breaker.
•
NCBDCSWI calculates the compensated circuit breaker status, fast load-
shedding trigger and load-shedding blocking.
7.3.4
Network power monitoring function NPMMXU
•
NPMMXU receives data for an individual source from PSCSWI. NPMMXU also
receives the load-shedding data from the adjacent PML630s via IEC61850
GOOSE.
•
NPMMXU controls the extended load-shedding functionality with the
configuration of the external connection connectivity setting.
•
NPMMXU does not consider the load-shedding data received from an adjacent
PML630 if the circuit breaker is opened of the remote end or the power source for
the external connection or the adjacent PML630 load-shedding is blocked in its
electrical network area, the external connection in the adjacent PML630 is not
configured correctly, the adjacent PML630 is in the test mode or its data quality
is bad.
Section 7
1MRS757256 F
Power management functions
210
PML630/Compact Load-Shedding Solution
Technical Manual
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