Manual blackout close
During a blackout, the operator can manually close the bus tie breaker by pushing the push button
Close breaker
on the display
unit.
12.3.4 Bus tie breaker trip flowchart
The controller automatically trips the bus tie breaker (BTB) for this alarm action:
•
Trip bus tie breaker
The controller does not require the bus tie breaker open conditions to be met for a breaker trip. Similarly, the bus tie breaker is not
de-loaded for a trip.
Table 12.8
Bus tie breaker trip flowchart
BTB opened
No
Yes
BTB tripped
Alarm
Bus tie breaker
trip
Open BTB
1.
Open BTB:
When a trip is required, the controller activates the
Breakers > Bus tie
breaker > Control > BTB open
output to open the breaker.
2.
BTB opened:
The controller checks whether the breaker has opened:
•
If the breaker has opened, the trip is successful.
•
If the breaker has not opened, the controller activates the
BTB opening failure
alarm.
12.4 Other BUS TIE breaker controller functions
12.4.1 Counters
You can view, edit and reset all the counters on the display unit under
Configure > Counters
. The counters include:
•
Bus tie breaker operations and trips
•
Active and reactive energy export (to busbar B)
•
Active and reactive energy import (to busbar A)
•
Active and reactive energy differential (the difference between the energy export and import)
•
External breaker operations
Energy counter outputs
For each energy counter, you can configure a digital output to send a pulse every time a certain amount of energy is transferred.
Configure the digital outputs under
Input/output > Digital output > Functions > Busbar A > Energy counters > [Counter pulse]
.
INFO
You must configure the digital output function to see the parameters.
Configure the energy transfer required for a pulse under
Parameters > Busbar A > Energy counters > [Counter]
.
DESIGNER'S HANDBOOK 4189340911K UK
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