MAN B&W
4.03
Page 6 of 6
MAN Diesel
198 43 156.2
MAN B&W K98MC/MC-C/ME/ME-C, S90MC-C/ME-C,
K90MC-C/ME/ME-C, S80MC/MC-C/ME-C, K80MC-C/ME-C,
S70MC/MCC/ME-C/ME-GI, L70MCC/ME-C, S65ME-C/ME-GI,
S60MC/MC-C/ME-C/ME-GI/ME-B, L60MC-C/ME-C,
S50MC/MC-C/ME-C/ME-B
In such a case, the problem is solved by installing
a small, elastically supported bearing in front of
the stator housing, as shown in Fig. 4.03.05.
As the DMG type is directly connected to the
crankshaft, it has a very low rotational speed and,
consequently, the electric output current has a
low frequency – normally of the order of 15 Hz.
Therefore, it is necessary to use a static fre-
quency converter between the DMG and the main
switchboard. The DMG/CFE is, as standard, laid
out for operation with full output between 100%
and 70% and with reduced output between 70%
and 50% of the engine speed at specified MCR.
Static converter
The static frequency converter system (see Fig.
4.03.06) consists of a static part, i.e. thyristors and
control equipment, and a rotary electric machine.
The DMG produces a threephase alternating
current with a low frequency, which varies in ac-
cordance with the main engine speed. This alter-
nating current is rectified and led to a thyristor in-
verter producing a threephase alternating current
with constant frequency.
Since the frequency converter system uses a DC
intermediate link, no reactive power can be sup-
plied to the electric mains. To supply this reactive
power, a synchronous condenser is used. The
synchronous condenser consists of an ordinary
synchronous generator coupled to the electric
mains.
Extent of delivery for DMG/CFE units
The delivery extent is a generator fully builton
to the main engine including the synchronous
condenser unit and the static converter cubicles
which are to be installed in the engine room.
The DMG/CFE can, with a small modification,
be operated both as a generator and as a motor
(PTI).
Yard deliveries are:
1. Installation, i.e. seating in the ship for the syn-
chronous condenser unit and for the static
converter cubicles
2. Cooling water pipes to the generator if water
cooling is applied
3. Cabling.
The necessary preparations to be made on
the engine are specified in Figs. 4.03.01a and
4.03.01b.
SMG/CFE Generators
The PTO SMG/CFE (see Fig. 4.01.01 alternative 6)
has the same working principle as the PTO DMG/
CFE, but instead of being located on the front end
of the engine, the alternator is installed aft of the
engine, with the rotor integrated on the intermedi-
ate shaft.
In addition to the yard deliveries mentioned for the
PTO DMG/CFE, the shipyard must also provide
the foundation for the stator housing in the case
of the PTO SMG/CFE.
The engine needs no preparation for the installa-
tion of this PTO system.
Summary of Contents for B&W S50MC-C8-TII
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Page 19: ...MAN B W MAN Diesel Engine Design 1 ...
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Page 35: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
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Page 65: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
Page 66: ......
Page 72: ......
Page 73: ...MAN B W MAN Diesel Electricity Production 4 ...
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Page 107: ...MAN B W MAN Diesel Installation Aspects 5 ...
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Page 171: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
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Page 193: ...MAN B W MAN Diesel Fuel 7 ...
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Page 209: ...MAN B W MAN Diesel Lubricating Oil 8 ...
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Page 223: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
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Page 233: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
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Page 237: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
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Page 243: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
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Page 255: ...MAN B W MAN Diesel Starting and Control Air 13 ...
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Page 263: ...MAN B W MAN Diesel Scavenge Air 14 ...
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Page 277: ...MAN B W MAN Diesel Exhaust Gas 15 ...
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Page 293: ...MAN B W MAN Diesel Engine Control System 16 ...
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Page 309: ...MAN B W MAN Diesel Vibration Aspects 17 ...
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Page 325: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
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Page 349: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
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Page 389: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
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Page 399: ...MAN B W MAN Diesel Appendix A ...
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