frequency difference. ASCGAPC allows to select sources for synchronization and
gives permission for matching to the selected sources after essential checks.
ASCGAPC allows autosynchronization of only one non-source circuit breaker at
a time. It also provides the voltage and frequency matching status for the
synchronization in progress.
9.8.4 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "on" and "off".
The operation of ASCGAPC can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
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SRC1_ASC_DAT
NS1_ASC_DAT
Topology
determinat-
ion
U_DIFF
FR_DIFF
ASC_SRC1_DAT
AS_CONFLICT
ASC_NS1_DAT
SRC8_ASC_DAT
NS17_ASC_DAT
U_DIFF_1
FR_DIFF_1
U_DIFF_17
FR_DIFF_17
ASC_SRC8_DAT
Coordinator
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BLOCK
ASC_NS2_DAT
ASC_NS2_DAT
Figure 883: Functional module diagram
9.8.4.1 Topology determination
This module identifies the group of busbars, power sources and network circuit
breakers electrically connected together and calculates the subnetwork number for
each group. It also identifies the sources and buses which are electrically connected
to the external network. The maximum network configuration considered is 8
sources, 8 source CBs (SCB), 15 busbars and 17 non-source CBs (NSCB).
The equipment which is capable of voltage and frequency adjustment,
that is, the generator, is referred to as source and the rest as non-source.
Hence the generator CB is referred to as source CB and the bus coupler
or tie feeder CB as non-source CB. Also, any bus or system, external to
this network is referred to as grid.
1MRS759142 F Control functions
REX640
Technical Manual
1609
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