Isolator Alarm Delay; Remote Trip Impulse Width; Event Memory - ABB RELION REB500 Operation Manual

Section 4
System settings
Setting the response to Block is more likely to cause a failure to trip and to Continue in
operation a mal-operation.
4.5.3

Isolator alarm delay

The busbar protection has a common alarm circuit and timer for monitoring the operation of
all the isolators and bus-tie breakers. The setting of the isolator operating time thus applies
for all the isolators and circuit-breakers in the system.
The time delay must be set longer than the slowest isolator operating time.
4.5.4

Remote trip impulse width

BBP and, where configured, BFP and EFP can send an intertripping signal to a remote station
via PLC or optical fiber communication channel:
• 21115_REMOTE TRIP
• 23110_BFP REMOTE TRIP
• 24105_EFP REMOTE TRIP
The impulse width generally has to be limited, typically to 200 ms.
Table 27:
Parameter
Remote trip impulse width
4.6

Event memory

The busbar protection includes an event memory for each individual unit (central unit and bay
units) in which the changes in statuses of binary signal are recorded. The event memories have
a capacity for 100 events in bay units and 1000 events in the central unit. The user can select
one of the storage strategies in
A time stamp (date and time with an accuracy of 1 ms), a text defined using the operator
program and a status (set or reset) are attached to every event. Individual texts can be entered
for each status.
Generally, one event is configured for every input and output, but events can also be assigned
to optocoupler inputs or relay outputs.
A central unit signal can only be stored in the event memory in the central unit, while a bay unit
signal can be stored in either the event memory in the central unit or in the bay unit or in both.
Table 28: Event memory storage strategy
Strategy
Keep the oldest (FIX)
Keep the latest (FIFO)
Keep <n> old and latest
34
Setting range of the remote trip impulse width
Min.
100
Table
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Max. Default
2000 200
28.
Explanation
No further events recorded when the memory is full
The oldest event should be overwritten (ring buffer)
Keeps the given number of old events, then overwrite
1MRK 505 400-UEN B
GUID-FE83DA35-B1C6-42AC-8F47-21E25F84906A v1
GUID-928B1BF4-8EE7-43A6-8082-5ECC4CF02A0C v2
Step Unit
10 ms
GUID-68DEEC75-0731-4F32-8C78-61D1B289B57D v1
Distributed busbar protection REB500
Technical manual