This paper presents an overview of the design and field installation events involved in rewinding and restacking AEP’s Conesville #5 generator. This style of generator, commonly known as a “double tube stack” machine, has been susceptible in the past to stator end winding vibration, stator coil and core deterioration, and phase lead problems. Following tests and inspections, AEP decided to rewind this generator in anticipation of the consequences of these problems. Successful pro-active maintenance, which included a complete stator rewind and stator core restack, prevented a costly forced outage. Root cause analysis of the coil failures are described, as well as details of the core laminations problems. Specific design enhancements over and above the original design will be discussed. In addition, details of the existing core damage will be discussed, as well as procedures used for core restacking. Fiber optic monitoring instruments were installed on the coil ends and the phase leads after the new coil installation was complete. Results of these initial readings will be shared. Successful startup and continued operation of this unit demonstrates that refurbishment of these large generators with inner gas cooled technology is reliable and cost-effective over other alternatives, such as conversion to water cooled technology.
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ASME 2004 Power Conference
March 30–April 1, 2004
Baltimore, Maryland, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4162-6
PROCEEDINGS PAPER
Rewind and Core Restack of AEP Conesville #5 Generator Available to Purchase
J. Timperley,
J. Timperley
American Electric Power, Columbus, OH
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J. Michalec,
J. Michalec
American Electric Power, Columbus, OH
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J. Hutt
J. Hutt
National Electric Coil, Olympia, WA
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J. Timperley
American Electric Power, Columbus, OH
J. Michalec
American Electric Power, Columbus, OH
W. Moore
National Electric Coil, Columbus, OH
H. Moudy
National Electric Coil, Columbus, OH
J. Hutt
National Electric Coil, Olympia, WA
Paper No:
POWER2004-52145, pp. 347-352; 6 pages
Published Online:
November 17, 2008
Citation
Timperley, J, Michalec, J, Moore, W, Moudy, H, & Hutt, J. "Rewind and Core Restack of AEP Conesville #5 Generator." Proceedings of the ASME 2004 Power Conference. ASME 2004 Power Conference. Baltimore, Maryland, USA. March 30–April 1, 2004. pp. 347-352. ASME. https://doi.org/10.1115/POWER2004-52145
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