Terminology; Power Network Configuration Support In Cpms Load-Shedding Configuration A - ABB RELION 630 Series Product Manual

Power Management
PML630/Compact Load-Shedding Solution
Product version: 1.2.1

7. Terminology

The terminology in a cPMS load-shedding Configuration A
solution is described using an example of a simple power
network.
1
From Grid/external network
0 MW
15 MW
2
6
5
7 MW
(9)
8
5 MW
(18)
4
2 MW
(3)
GUID-DE901D73-586B-4BC2-9174-39DCB8DD32CB V2 EN
Figure 2. Terminology
1 Power source - Generator
1a Generator Available Power (capacity)
2 Power source - Grid transformer
2a Grid Available Power (power limit)
3 Power busbars with power sources and loads
4 Load busbars with only load feeders
5 Network circuit breaker (critical circuit breaker)
6 Power source circuit breaker (critical circuit breaker)
7 Load-shedding feeder or load-shedding group
8 Load-shedding priority for load feeder
9 Power flow direction
10 Power network area (under PML630's load-shedding
responsibility)
8. Power network configuration support in cPMS load-
shedding Configuration A
PML630 can support power networks certain configurations.
ABB
9 1a
From Grid/external network
10 MW
20 MW
- 5 MW
7 MW
(19)
5 MW
(10)
5 MW
3 MW
(4)
(5)
1 MW
2 MW 0.5 MW
(2) (1)
(5)
• Six generators
• Two power grid utility connectivity (tie or transformer feeder)
• Six single busbars
• Four subnetworks with power sources
The grid feeder 1 can be connected to the power busbar 1 and
the grid feeder 2 can be connected to the power busbar 1 or 2.
2a
3
10
7
GUID-96FDF815-0F08-432B-B463-A87421269BD9 V2 EN
Figure 3. Typical busbar configurations (not preconfigured)
PML630 can support a power network under certain
conditions.
• 23 critical circuit breakers consisting of eight power source
circuit breakers and 15 equivalent bus coupler/bus tie
network circuit breakers. For example, two circuit breakers at
either end of a bus tie feeder are considered as a single
equivalent bus tie feeder.
• 60 sheddable loads or load-shedding groups arranged
across six busbars (four power busbars and two load
busbars) with individual load-shedding priorities.
• 10 sheddable loads or load-shedding groups in a single
busbar.
• 19 user-assignable load priorities.
A load-shedding group can be considered if the number of load
feeders connected to a busbar exceeds 10. The maximum
recommended number of feeders under a load-shedding group
is three.
1MRS757334 E
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