Name Range Default Notes
If this value is too low, there can be reverse power when the breaker
closes.
Delta frequency
max.
0.0 to 2.0 Hz 0.3 Hz
For synchronisation: Add Delta frequency max. to the busbar frequency,
for the maximum frequency of the synchronising generator.
Delta frequency max. must always be higher than Delta frequency min.
Delta voltage min.
2 to 10 % of nominal
voltage
5 %
The maximum that the voltage of the synchronising generator may be
below the voltage of the busbar for the breaker to close.
Delta voltage
max.
2 to 10 % of nominal
voltage
5 %
The maximum that the voltage of the synchronising generator may be
above the voltage of the busbar for the breaker to close.
Breaker close
time
40 to 300 ms 50 ms
The time between when the close breaker signal is sent and when the
breaker actually closes.
Frequency window example
Busbar frequency: 50.1 Hz
Delta frequency min.: -0.1 Hz
Delta frequency max.: 0.3 Hz
The generator frequency must be between 50.0 Hz and 50.4 Hz for synchronisation.
For a SHAFT generator controller, the synchronisation settings for power take home (PTH) can be configured separately. These are
under Synchronisation setting (PTH).
More information
See SHAFT generator controller, Other SHAFT generator controller functions, Power take home (PTH) for more
information.
Slip frequency
The slip frequency is calculated as follows:
Slip frequency = (Delta frequency min. + Delta frequency max.)/2
Slip frequency example
Delta frequency min.: -0.1 Hz
Delta frequency max.: 0.3 Hz
The slip frequency is 0.1 Hz.
When the dynamic synchronisation starts, the frequency control function regulates the synchronising genset frequency towards the
following set point:
f
set point
= f
busbar
+ Slip frequency
Slip frequency bad example
Delta frequency min.: -0.3 Hz
Delta frequency max.: 0.3 Hz
DESIGNER'S HANDBOOK 4189340911K UK Page 153 of 521
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