Turbo generator
A turbo generator is an
Small turbo-generators driven by gas turbines are often used as auxiliary power units (APU, mainly for aircraft).
History
The first turbo-generators were electric generators powered by
Turbo generators were also used on steam locomotives as a power source for coach lighting and
Construction features
Turbo generators are used for high shaft rotational speeds, typical of steam and gas turbines. The
The normal speed of a turbo generator is 1500 or 3000 rpm with four or two poles at 50 Hz (1800 or 3600 rpm with four or two poles at 60 Hz). The rotating parts of a turbo generator are subjected to high mechanical stresses because of the high operation speed. To make the rotor mechanically resistant in large turbo-alternators, the rotor is normally forged from solid steel and alloys like chromium-nickel-steel or chromium-nickel-molybdenum are used. The overhang of windings at the periphery will be secured by steel retaining rings. Heavy non-magnetic metal wedges on top of the slots hold the field windings against centrifugal forces. Hard composition insulating materials, like mica and asbestos, are normally used in the slots of rotor. These material can withstand high temperatures and high crushing forces.[6]
The stator of large turbo generators may be built of two or more parts while in smaller turbo-generators it is built up in one complete piece.[7]
Hydrogen-cooled turbo generator
Based on the air-cooled turbo generator, gaseous
The generator is hermetically sealed to prevent escape of the hydrogen gas. The absence of oxygen in the atmosphere within significantly reduces the damage of the windings' insulation by eventual corona discharges. The hydrogen gas is circulated within the rotor enclosure, and cooled by a gas-to-water heat exchanger.[9]
See also
Notes
References
- ^ Ginet, C.; Joho, R.; Verrier, M. "The turbogenerator – A continuous engineering challenge" (PDF). Archived from the original (PDF) on 2010-08-21.
- ^ "Vízenergia hasznosítás szigetközi szemmel Avagy mi lesz veled, Dunakiliti?" (PDF). Archived from the original (PDF) on 2013-10-15. Retrieved 2013-10-15.
- ISBN 0195168747.
- ^ Scientific American, 27 April 1901
- ISBN 978-1-259-08116-3. Archivedfrom the original on 11 February 2018. Retrieved 8 August 2017.
- ISBN 978-1-259-08116-3. Archivedfrom the original on 11 February 2018. Retrieved 8 August 2017.
- ISBN 978-1-259-08116-3. Archivedfrom the original on 11 February 2018. Retrieved 8 August 2017.
- ^ National Electrical Manufacturers Association (11 February 2018). "A chronological history of electrical development from 600 B.C." New York, N.Y., National Electrical Manufacturers Association – via Internet Archive.
- ^ "Aeroderivative & Heavy-Duty Gas Turbines - GE Power". www.gepower.com. Archived from the original on 2010-05-05.