Siemens Footprint™ Generator
Tailor-Made Generator Replacement Concept
A characteristic of Siemens generators
has been their extensive service life.
They have operated in some power
plants for several decades without failure.
If required, older models can be adapted
to new efficiency standards and operating
modes while increasing availability and
reliability through the systematic implementation of modernization measures
and upgrades.
After a certain age or degree of wear,
however, careful consideration should
be given to whether further investments
in the generator are still profitable in the
long term, or whether a complete replacement is a more economically viable option.
Increased time and effort spent on maintenance and repair measures, outdated
technology and materials, spare part procurement issues, as well as signs of aging
and damage can all be strong arguments
in favor of investing in a new generator
and against a partial modernization.
Siemens has responded to these demands
by introducing the Footprint generator
concept. This involves the replacement of
older, high-maintenance water-, hydrogenor air-cooled generators with an output
of up to 300 MVA with modern air-cooled
Siemens generators.
Siemens Footprint generator adapted to existing
foundation
Performance Enhancement – Generator
Answers for energy.
Our Solution
In a joint effort, you and Siemens can find
the best solution for your power plant by
performing a comprehensive cost-benefit
analysis. Siemens can then advise you of
recommendations whether to modernize
or replace your generator. In the case of
purchasing a new machine, the generator
can either be replaced during a major overhaul, or the replacement generator can
be individually adapted and implemented
as a separate measure.
Prior to replacing the generator, your
unit is subjected to a comprehensive and
detailed analysis. History, current maintenance status, technical records and dimensional data as well as electrical parameters,
such as power rating, efficiency, power
factor, reactances and rated voltage are
taken into consideration for the purpose
of this analysis. In addition to generators
from our own product range, including
AEG, Parsons and Westinghouse, Siemens
also offers custom-fit replacements of
generators by other suppliers.
Features
Siemens Footprint generators of the
SGen-100A-2P series can be used in
various types of power plants and configurations. They reach power ratings
of up to 300 MVA and are designed for
up to 10,000 start/stop cycles.
Due to its modular design concept, the
air-cooled Footprint generator can be
tailored to fit into the existing plant configuration. This concept can allow for an
efficient and individual adaptation of the
new generator to local site conditions
and has already been successfully in use
for years. The existing foundation and
electrical connections can remain in use
and the axial shaft center height maintained. Furthermore, the amount of
­ xisting high-maintenance auxiliaries can
e
be ­reduced if a water or hydrogen-cooled
generator is replaced by an air-cooled
machine, thus eliminating the need to
­replace or service this equipment.
Siemens Footprint generators are characterized by the following design features:
Patented rotor cooling system
The optimal distribution of the cooling air
in connection with an optimal heat transfer
in the rotor winding fosters a uniform
temperature distribution in the rotor,
which in turn can increase efficiency.
Flexible cooling system
Various cooling system configurations
are available for the Footprint generator:
a closed-circuit water-to-air cooling system,
a direct air cooling system with air supplied
through a filter or a closed-circuit air-to-air
cooling system.
Solid base frame
The frame of the replacement generator
can be adapted to many existing foundations. It can be supplied in a completely
­assembled state which can lead to a significant reduction of installation time in the
field.
Patented outer corona protection
­system
The multiple-layer outer corona protection of the stator winding is designed for
a more reliable and durable insulation
system.
If you decide on a new Footprint
­generator, you can benefit from:
■■ Latest Siemens technology
■■ More reliable spare parts services
■■ Comprehensive and customized
­service contracts
■■ Continuous updates on further
product developments, maintenance
and upgrades.
Proven MICALASTIC® stator insulation
The proven epoxy-mica insulation system
can enable reliable stator operation, even
at some extreme temperatures and under
some adverse ambient conditions while
keeping the scope of required maintenance low.
Optimized vibration behavior
The design of the stator end winding has
been optimized to help minimize vibration
levels during operation and damage to the
insulating components.
Your Benefit
Siemens’ tailor-made generator replacement concept is characterized by the
­following advantages:
■■ Opportunity to increase the efficiency
of your power plant
■■ Higher power ratings are possible
in most cases.
■■ Foundation is typically not changed.
■■ Outage time can be determined more
precisely and can, in certain cases,
be significantly shorter than for a partial
modernization
■■ Risk of finding unexpected signs of
aging or damage and the associated
costs can be reduced
■■ Potential of a longer service life
of all components
■■ Operating and maintenance costs
can be reduced in many cases.
SGen-100A-2P generator with brushless
­excitation system mounted on base frame
Adapted excitation system
The exciter is available in the form of a
static or brushless system, depending
on customer requirements. In the case
of generator ­replacement, the existing
exciter should be replaced by a modern,
low-maintenance brushless excitation
system.
References
The Footprint generator concept has been
implemented, for example, in power
plants in the Czech Republic, Finland,
South Africa and Taiwan. More than
500 air-cooled SGen-100A-2P generators
are already in operation worldwide.
More detailed information on the
­Siemens Footprint generator concept
is available on our “Footprint™
­generator” DVD.
Flexible position of generator leads
The generator lead box can be designed
as a side, top or bottom-mounted
­assembly.
Published by and copyright © 2012:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Energy, Inc.
4400 Alafaya Trail
Orlando, FL 32826-2399, USA
www.siemens.com/energy
For more information, please contact
our Customer Support Center.
Phone: +49 180 524 70 00
Fax: +49 180 524 24 71
(Charges depending on provider)
E-mail:support.energy@siemens.com
For more information please contact
your local Siemens sales representative.
Energy Service Division
Order No. E50001-G520-A448-X-4A00
Printed in Germany
Dispo 34805, c4bs No. 7816, 7823
TH 258-120015 BR 461081 DB 08121.0
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are the property of Siemens AG, its affiliates,
or their respective owners.
Subject to change without prior notice.
The information in this document contains
general descriptions of the technical options
available, which may not apply in all cases.
The required technical options should therefore
be specified in the contract.