Influence of the air gap length on the magnetic core loss in large hydro generator

Aguiar, Ana B. M.; Merkhouf, Arezki; Al‐Haddad, Kamal

doi:10.1109/icelmach.2012.6349886

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…Observations on site and expertise of other researchers investigating air gap size [14] suggested that the air gap changed significantly as the stator temperature changed; therefore, the variation of the air gap during the generator warm-up and different modes was registered. The results are shown below in Fig.…”

Section: Temperature Change Effects On the Air Gapmentioning

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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Section: Temperature Change Effects On the Air Gapmentioning

confidence: 99%