Operation and Maintenance of Large Turbo‐Generators

Klempner, Geoff; Kerszenbaum, Isidor

doi:10.1002/0471683388

Cited by 57 publications

(37 citation statements)

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“…All the specimens were machined from trial components. The specimens in the rotor material were produced according to the following procedure [7,19]: oxygen furnace melts were bottom poured for having a single ingot. The melts were vacuum-degassed (vacuum oxigen decarburization) using the lift-gas method to ensure low levels of hydrogen.…”

Section: Methodsmentioning

confidence: 99%

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

Olmi

Freddi

2010

EPJ Web of Conferences

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Abstract. Turbogenerator rotors and coil retaining rings (CRRs) are highly loaded components typically subjected to LCF at any machine switch-on and switch-off. The present study aims at LCF characterization of two widely applied steels, 26 NiCrMoV 14 5 (for rotor manufacturing) and 18Mn18Cr (for CRR). Material anisotropy is also considered by performing an extended experimental campaign on specimens machined along different (tangential and radial) directions from trial components. The experimental tests, carried out with the use of a novel testing-constraining device for misalignment auto-compensation and with an original methodology for strain controlling, led to the determination of static, cyclic and fatigue curves for all the investigated cases. The research was completed by sensitivity analyses on the adopted models, thus determining fatigue curve tolerance bands, and by a statistical Analysis of Variance to compare the LCF performance of the different materials along the two considered machining directions. Results showed a significantly better performance of 18Mn18Cr and a weak anisotropy effect, remarkable just at the highest strain values, on a reduced portion of the LCF life range.

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Section: Methodsmentioning

confidence: 99%

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

Olmi

Freddi

2010

EPJ Web of Conferences

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“…Stator does not rotate, but it is subject to thermal expansion effects, and as noted three decades earlier, it is more deformable than rotor and yields to a variety of forces [4]. According to Chapter 2.6 [6], the forces in the stator frame and foundation are massive, especially during instantaneous changes in generation modes. Therefore, the objective of the paper was to study simultaneously the temperature effects and the impact of centrifugal and magnetic forces on the air gap.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Air Gap Change of Low-Speed Generator Considering Thermal Expansion, Centrifugal Force and Magnetic Force Effects

Cerpinska

Elmanis-Helmanis

2017

Latvian Journal of Physics and Technical Sciences

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The paper provides the data collected over a three-year period to illustrate the dynamic air gap change depending on generation modes of four hydropower generators with similar design. The tests were performed on hydropower units at the rated apparent power of 105 MVA and the air gap of 20 mm. The results obtained showed that the average air gap change in different modes could reach up to 2.1 mm. Around 90 % of air gap change results from thermal expansion and 10 % were determined by centrifugal and magnetic forces. In coasting mode when the power was switched off and the speed of the generator decreased, the air gap increased up to 0.7 mm. Attraction forces resulting from magnetic phenomena accounted for 0.1-0.6 mm decrease in the air gap.

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“…Dyer, özellikle birbirleriyle konuĢurken (ticari ve profesyonel dergilerde) sözlerde bir düĢmanlık ve saldırganlığın açığa çıktığını; piyasanın "silah", reklâmın "satıĢ sınırında muharebe", reklâmcıların becerilerinin "silahsız muharebe", tüketicilerin ise "satıĢ direnç güçleri" olarak görüldüğünü söylemektedir. Klempner (2004)"e göre hayatlarını devam ettirebilmeleri için sürekli üretim yapmaya ve bu üretilen ürünleri sunacak bir pazara ihtiyaç duymakta olan Ģirketlerin reklâmdan faydalanması en doğal haklarıdır ancak bu noktada iĢ etiği kurallarına da uymaları gerekmektedir. Ona göre reklâmcılar, tüketicilere düĢlerini satmaktadır ve bunu gerçeklerle harmonize etmektedir.…”

Section: Reklâmda Zanaat Tartışmaları ( Talep İçin üRetim )unclassified

Reklam Bi̇r Sanat Midir?

Alici¹

2014

Celal Bayar Üniversitesi Sosyal Bilimler Dergisi

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Operation and Maintenance of Large Turbo‐Generators

Cited by 57 publications

References 0 publications

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

Dynamic Air Gap Change of Low-Speed Generator Considering Thermal Expansion, Centrifugal Force and Magnetic Force Effects

Reklam Bi̇r Sanat Midir?

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