•
SG-DG max. parallel time (in the SHAFT generator controller)
•
DG-SG max. parallel time (in the GENSET controllers)
More information
See
Power management
,
Load sharing
,
SHAFT generator base load
for more information.
10.4.3 Shaft generator load transfer without parallel
If two power sources cannot be synchronised, then you cannot transfer the load directly from the one to the other without
interrupting the supply. For example, you cannot transfer the load directly from a shaft generator to another shaft generator, or from
a shaft generator to a shore connection.
However, the power management system includes a pre-programmed sequence to automatically transfer load. It does this by using
the gensets in AUTO mode to supply the load during the transition (if they can supply the load). The sequence starts when the
operator presses
Close
on the non-connected SHAFT generator or SHORE connection controller display unit.
For a load transfer using gensets from a shaft generator to another shaft generator, the steps of the sequence are:
1. The operator presses
Close
on the second SHAFT generator controller display unit.
2. The power management system starts and connects enough gensets to take the load from the first shaft generator.
3. The power management system regulates the gensets so that they de-load the first shaft generator.
4. The power management system opens the first shaft generator breaker.
5. The power management system synchronises the gensets to the second shaft generator.
6. The power management system closes the second shaft generator breaker.
7. The power management system regulates the gensets to transfer the load to the shaft generator.
8. The power management system disconnects and stops the gensets.
10.4.4 Shaft generator frequency variation
If the shaft generator frequency exceeds a set point (that is, too high or too low), then the power management system (PMS) starts
the first priority genset. If the frequency exceeds the next set point, then the genset(s) synchronise, connect, and take over the load
from the shaft generator.
You can use the parameters to customise the PMS response to frequency variation. The display unit shows an operator information
message when the frequency exceeds the set points and the function is activated. The events are also recorded in the log.
Parameters
Configure these parameters under
Configure > Parameters > Local power management > Shaft generator f [Hz] variation >
Frequency [Hz] variation
.
Parameter Range
Default
Notes
Enable
Not enabled, Enabled Enabled
Not enabled
: Frequency variations do not activate this function.
Enabled
: The function is activated when the shaft generator frequency exceeds a
set point.
Configure these parameters under
Configure > Parameters > Local power management > Shaft generator f [Hz] variation >
Engine start
.
DESIGNER'S HANDBOOK 4189340911K UK
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