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Generator Upgrades: The Rest of the Story

[+] Author Affiliations
Steve Kilmartin, James W. Clark

Environment One Corporation

Les Lake


Paper No. POWER2006-88110, pp. 317-324; 8 pages
  • ASME 2006 Power Conference
  • ASME 2006 Power Conference
  • Atlanta, Georgia, USA, May 2–4, 2006
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-4205-3 | eISBN: 0-7918-3776-9
  • Copyright © 2006 by ASME


It is not unusual for well maintained and operated generators to be in use long after the OEM’s designed life expectancy. In fact, most large utilities in the United States have generators in their fleets that have been in operation for well over 30 years. With a growing dependence on electric power and the prohibitive cost of outage extensions, there have been increased efforts to obtain higher operating voltages while increasing reliability. To accomplish this, it may require the replacement of major components such as armature windings, field windings or a complete rotor. Upgrading generator components can be a complicated process that requires a considerable amount of preplanning, extended outage time and a significant financial investment. Not all generator service issues are solved with a rewind. Often ignored during generator upgrades are the auxiliary systems; seal & lube oil, hydrogen cooling, gas supply & controls, stator cooling water and monitoring systems. The auxiliary system equipment is critical to ensure efficient, reliable and safe operation of the generator. Time and wear of auxiliary system components have a direct impact on the generator availability and could potentially lead to a generator problem that could lead to a catastrophic failure. A proactive approach to upgrading these critical auxiliary systems will help secure your return on investment involved in rewinding a generator. This paper identifies the benefits for evaluating and upgrading generator auxiliary systems.

Copyright © 2006 by ASME
Topics: Generators



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