Maintenance of large turbine generator rotors
- National Electric Coil, Columbus, OH (United States)
The turbine generator is a complex piece of electrical equipment. For it to give continuous satisfactory service, its conditions must be monitored and proper maintenance given to the unit. The very large units in the range of 200 MVA and larger often employ special designs with regard to conductor size, shape, and method of cooling. The smaller units are somewhat more standardized but also require their share of attention with regard to maintenance. The turbine generator rotor has essentially been designed to operate continuously as a base load machine. Its use as a peaking unit with gas turbines has accelerated some of the problems with this type of unit. Recently, some manufacturers have made design changes hoping to improve the performance of medium capacity units with regard to frequent start/stop cycles. These design changes include: bearing with jacking oil pumps to secure oil film thickness at low speeds; means for maintaining constant control of stator coil outlet coolant temperature to reduce fatigue of insulation and brazed joints; automatic synchronizing equipment to reduce current torques due to improper operations; supervising and monitoring equipment to monitor time wise changes in core and coil temperatures and shaft vibration; and fans, heaters, etc., to prevent dew from forming during unit shutdown. In general, the problems encountered are a function of the number of cycles of operation, that is, start up, running and shut-down. As such, many of the problems can be analyzed in terms of the various temperature coefficients of expansion of the components and their temperatures throughout a cycle.
- OSTI ID:
- 405477
- Report Number(s):
- CONF-951208-; TRN: 96:004301-0025
- Resource Relation:
- Conference: Power-Gen America `95: power generation conference, Anaheim, CA (United States), 5-7 Dec 1995; Other Information: PBD: 1995; Related Information: Is Part Of Power-Gen `95. Book V: Operating plants. Volume 1 - performance enhancement. Volume 2 - operation & maintenance cost reduction; PB: 364 p.
- Country of Publication:
- United States
- Language:
- English
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