Figure 10.2
Power from diesel gensets used for PTH
G
G
G
G
Busbar
Genset 1
Genset 2
Genset 3
Shaft generator
If two shaft generators are present, the power from one shaft generator can be used for PTH by the other SHAFT generator
controller, as shown in the following drawing.
Figure 10.3
Power from one shaft generator used for PTH by the other SHAFT generator controller
G
Busbar
Shaft generator 2
G
Shaft generator 1
DANGER!
Do not use both shaft generators as power sources and run them in parallel. It is impossible to keep the shaft generators
synchronised.
PTH as an inhibit
When the
PTH
input is activated in a SHAFT generator controller, these protections are deactivated by the
Power take home
inhibit
in the SHAFT generator controller:
•
Reverse power 1 and 2
•
SG-SG max. parallel time
•
SG-DG max. parallel time
This protection is deactivated by the
Power take home
inhibit in all the connected GENSET controllers:
•
DG-SG max. parallel time
Conditions for starting PTH
PTH is started when the
Power take home
digital input is activated and the shaft generator breaker receives a
Close
command. The
Close
command could be a digital input, or an input from the breaker close push-button
on the SHAFT generator controller
display unit.
DESIGNER'S HANDBOOK 4189340911K UK
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