Figure 4.8 Example of ABP with two bus tie breakers
Genset A
G
BUS TIE
breaker
controller
Genset B
G
Genset C
G
Genset D
G
BUS TIE
breaker
controller
Genset E
G
Genset F
G
Bus tie
breaker 1
Bus tie
breaker 2
Busbar
A
Busbar
A
Busbar
B
Busbar
B
If all the ABP protections are enabled in both BUS TIE breaker controller 1 and BUS TIE breaker controller 2:
• If the governor/AVR fails on Genset A:
◦ One of the ABP protections trips bus tie breaker 1, to protect the section with Gensets C, D, E and F.
◦ Bus tie breaker 2 does not trip, because there is a closer bus tie breaker with ABP enabled (that is, bus tie breaker 1).
• If the governor/AVR fails on Genset C:
◦ One of the ABP protections trips bus tie breaker 1, to protect the section with Gensets A and B.
◦ One of the ABP protections trips bus tie breaker 2, to protect the section with Gensets E and F.
If all the ABP protections are only enabled on BUS TIE breaker controller 2:
• If the governor/AVR fails on Genset A:
◦ One of the ABP protections trips bus tie breaker 2, to protect the section with Gensets E and F.
• If the governor/AVR fails on Genset C:
◦ One of the ABP protections trips bus tie breaker 2, to protect the section with Gensets E and F.
If none of the ABP protections are enabled in the BUS TIE breaker controllers, but all of the ABP protections are enabled in the
GENSET controllers:
• If the governor/AVR fails on Genset A:
◦ One of the ABP protections can trip the Genset A generator breaker.
◦ One of the AC protections can trip the Genset A generator breaker.
◦ One of the AC protections can trip Genset B, C, D, E or F's generator breaker.
Parameters in the GENSET controllers
Configure this parameter under Configure > Parameters > Local power management > Advanced blackout prevention.
Parameter
Range Default Comment
Delay after load
share changes
0 s to 1 h 12 s
After any of the following changes in the busbar section, ABP is disabled for the configured
delay:
• A genset connects.
• A genset disconnects. The timer starts when de-loading starts.
• A BTB closes.
DESIGNER'S HANDBOOK 4189340911K UK Page 129 of 521
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