TB open signal
TB closed
Yes
No
TB opened
Voltage on
main busbar
Yes
No
GB closed
No
Yes
Blackout
response
Open TB
TB opened
No
Yes
TB opened
Alarm
TB sync.
enabled
No
Yes
Info message
Engine
running
No
Yes
Info message
Open TB
TB opened
Close GB
End
1.
TB closed:
After getting the emergency busbar tie breaker open signal, the controller checks whether the tie breaker is open.
•
If the tie breaker is open, the sequence ends.
•
If the tie breaker is not open, the sequence continues.
2.
Voltage on main busbar:
The controller checks whether there is voltage on the main busbar.
•
If there is voltage on the main busbar, the controller continues with the sequence. (Note that if a
Main busbar is OK
digital
input is configured, this must also be activated.)
•
If there is not voltage on the main busbar, the controller uses the blackout response.
3.
GB closed:
The controller checks whether the genset breaker is closed.
•
If the genset breaker is closed, the controller opens the tie breaker immediately.
•
If the genset breaker is open, the controller checks whether
Tie breaker sync. enabled
is enabled.
◦
If
Tie breaker sync. enabled
is enabled, then the display unit shows an info message (GB open). The operator must first
close the generator breaker before the tie breaker can be opened.
◦
If
Tie breaker sync. enabled
is not enabled, then the controller checks whether the engine is running.
◦
If the engine is running, the controller opens the tie breaker. When the tie breaker position feedback confirms that the
tie breaker is open, then the controller closes the generator breaker.
◦
If the engine is not running, then the display unit shows an info message.
9.5.8 Tie breaker trip flowchart
The controller automatically trips the tie breaker (TB) for this alarm action:
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