Parameter Range Default Comment
• A BTB opens. The timer starts when de-loading starts.
• Asymmetric load sharing is activated/deactivated in a GENSET controller.
• An asymmetric load sharing parameter is changed in a GENSET controller.
Use this delay to stop ABP from tripping the generator breaker due to normal load sharing
changes. This delay timer must run out before the delay configured in an ABP protection can
start.
Note that a bus tie breaker trip caused by an ABP protection does NOT reset the ABP timer
for the genset.
The GENSET controllers also include the following ABP alarms:
• P load sharing failure (low frequency) on DG
• P load sharing failure (high frequency) on DG
• Q load sharing failure (low voltage) on DG
• Q load sharing failure (high voltage) on DG
Parameters in the BUS TIE breaker controller
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
The conditions for this delay are the same as for the GENSET controllers.
Use this delay to stop ABP from tripping the BTB due to normal load sharing
changes. This delay timer must run out before the delay configured in an ABP
protection can start.
The BUS TIE breaker controllers also include the following ABP alarms:
• P load sharing failure (low frequency) on a DG
• P load sharing failure (high frequency) on a DG
• Q load sharing failure (low voltage) on a DG
• Q load sharing failure (high voltage) on a DG
• Overload on a DG
• Reverse power on a DG
• Reactive power export on a DG
• Reactive power import on a DG
• Over-current on a DG
Examples of ABP
These examples are based on the following single-line drawing, and the default ABP parameters. All the ABP alarms are enabled.
Figure 4.9
Example of an ABP single-line drawing
Genset A
G
Genset B
G
Bus tie
breaker
Genset C
G
Genset D
G
DESIGNER'S HANDBOOK 4189340911K UK Page 130 of 521
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