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If there are no external connections to adjacent electrical network
areas, the external connections can be configured as grid transformers.
When the electrical network size exceeds the network definition/configuration
mentioned earlier, additional PML630 is needed to handle load-shedding for an
extended network. In such a scenario, the electrical network is divided into smaller
network areas and each network area is allocated its own PML630 (and associated
supporting feeder IEDs) that is responsible for the load-shedding functionality in that
designated area. In a network segment, a PML630 exchanges information related to
its own area with the adjacent area’s PML630. This is to consider the overall power
system data while doing load-shedding in its own area. Such a configuration is
referred to as cPMS load-shedding configuration B.
In cPMS load-shedding configuration B, PML630s share the spinning reserve (that is,
power balance) power over GOOSE communication with each other. Load-shedding
can also be initiated in one of the network areas on the opening of remote end circuit
breaker or extending load-shedding action.
In certain conditions, PML630 automatically reverts to the cPMS load-shedding
configuration A mode.
•
When PML630 loses communication with the PML630s of adjacent electrical
areas.
•
When the load-shedding is blocked in adjacent network areas.
•
When the PML630s of adjacent electrical areas go into test mode.
•
When circuit breaker is opened for external connections at either end.
For these causes, PML630 does not consider the load-shedding data received from an
adjacent PML630.
7.2
Load-shedding principles and terminology
is a typical single-line diagram of an industrial system showing different
network elements and their nomenclature in an electrical network.
Section 7
1MRS757256 F
Power management functions
202
PML630/Compact Load-Shedding Solution
Technical Manual
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