Consumers
Power, Cobb Unit 4 |
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| Generator
Replacement Feasibility Study |
| On behalf
of Siemens-Westinghouse Power Corporation (SWPC), Integrated
Consultants & Engineers led a team of Dynamic Power Technologies,
LLC resources and conducted a comprehensive study and preliminary
engineering to determine the plant modifications that will be
necessary in order to replace the existing electrical generator.
The Cobb Unit 4 steam turbine-generator set is a 1950's vintage
design and in recent years the generator has degraded to the
extent that maintenance was becoming overly costly; requiring
replacement. Even though modern machines are designed to match
the existing plant duty conditions, the configurations of modern
machines rarely match that of the older units. Consequently,
modifications to the turbine pedestal concrete, isophase bus
and auxiliary piping systems are required. |
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The ICE
led team worked in close harmony with SWPC engineering in order
to optimize the position of the generator on the foundation.
As indicated above, the final position selected required that
SWPC provide a "jack-shaft" spacer between the turbine
and generator couplings, but which minimized the amount of costly
concrete demolition / reconstruction and provides for least-cost
bus modifications. It was also necessary to design an adapter
plate (incorporating new anchor bolts) that will be anchored
to each side of the foundation to provide vertical support,
since the new generator support feet are lower than the existing
support feet by about 12 inches. Based on the preliminary engineering,
SWPC was provided with project implementation engineering pricing
and estimated construction costs for the electrical, mechanical
and civil disciplines.
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