Event Log; Load-Shedding Performance - ABB RELION 630 Series Product Manual

Power Management
PML630/Compact Load-Shedding Solution
Product version: 1.2.1
Initiation of the power balance calculations does not imply the
operation of the fast or slow load-shedding function, since it
depends on the available power in the subnetwork. A negative
power deficit due to a power source outage in the power
network or the opening of a network circuit breaker activates
the PML630 device to issue the load-shedding commands.
The disturbance recorder function provides the values of an
available power, a load and a priority in each subnetwork before
and after the load-shedding calculation initiation. This helps in
ascertaining the power situation in the subnetworks before and
after the load-shedding start event.
PML630 can record the shedding priorities of the recent and
the last two load-shedding actions in every subnetwork.
The disturbance recorder and the Start LED on the device's
front panel user interface are both activated by the load-
shedding start signal.
Handling for double busbar configuration
PML630 handles single busbar-based network configurations
inherently. However, a double busbar-based network can be
accommodated using adaptations in configuration and
additional engineering steps involving logic creation. The
supported power network can be:
• 2 generators
• 2 grid transformers
• 3 double busbars
• 6 outgoing transformer or tie feeders and bus couplers
• 30 sheddable loads or load-shedding groups
For a double busbar configuration, the power source and load
feeder protection relays can only be based on the 630 series
only.
ABB
Buscoupler
Isolator
CB
GRID1
GRID1
G
GN1
Load
Feeder
SL1 SL10
GUID-6FCBF8FD-C034-417C-886B-F2A66CDC5C47 V2 EN
Figure 7. Example of a simple double busbar configuration
(Configuration A)

15. Event log

PML630 features an event log which enables logging of event
information. The event log can be configured to log information
according to user pre-defined criteria including device signals.
To collect sequence-of-events (SoE) information, the device
incorporates a non-volatile memory with a capacity of storing
1000 events with associated time stamps and user definable
event texts. The non-volatile memory retains its data also in
case the device temporarily loses its auxiliary supply. The event
log facilitates detailed pre- and post-fault analyses of faults and
disturbances.
The SoE information can be accessed locally via the user
interface on the device's front panel or remotely via the
communication interface of the device. The information can
further be accessed, either locally or remotely, using the web-
browser based user interface.
The logging of communication events is determined by the used
communication protocol and the communication engineering.
The communication events are automatically sent to station
automation and SCADA systems once the required
communication engineering has been done.

16. Load-shedding performance

All load-shedding application functions are executed at a 10 ms
cycle time. Therefore, the conservative performance of the fast
load-shedding function in PML630 is up to 20 ms; earliest
guaranteed execution being within 10 ms. The performance
time is measured from the moment when a trigger event, such
as an outage or a protection operation, reaches PML630 to the
moment when the load-shedding commands are issued.
1MRS757334 E
Tie
Feeder
GRID2
GRID2
SL1 SL10
LBB3 LBB5
(Bus C) (Bus E)
LBB4
LBB6
(Bus D) (Bus F)
SL1 SL10
LBB2
(Bus B)
LBB1
(Bus A)
G
GN2
19