8. Pros and Cons (shaft
generators versus gensets)
In the following, a number of advantages
and disadvantages related to the use of
shaft generators are discussed:
8.1 Advantages – shaft generators
• Small space requirement
The shaft generator is installed close
to the engine or the shaft line, and often
takes up no further space than is
already set aside for the engine installation.
In particular, the PTO BW III
(engine side mounted) and the PTO
BW IV (tunnel gear) require little
space for the installation. The SMG/
CFE and the DMG/CFE need extra
space elsewhere in the engine room
for the synchronous condenser and
the control cubicles
• Low investment cost (PTO/GCR)
The investment cost depends on the
type and make of the shaft generator.
Depending on the origin of the shaft
generator, the PTO/GCR can be purchased
at a relatively low price,
whereas the frequency controlled
types (PTO/RCF and PTO/CFE) are
relatively expensive
• Low installation cost
The shaft generator requires no separate
(or only a simple) foundation, no
exhaust gas system and only a few
connections to the auxiliary equipment.
Furthermore, the time spent installing
a shaft generator is normally
short
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