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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Asinchroninių generatorių tyrimas / Study of the induction generator

Ščerba, Andrius 02 June 2011 (has links)
Darbe atlikti trifazio asinchroninio generatoriaus, sujungto pagal nepriklausomo žadinimo ir pagal susižadinimo schemas, prie įvairių apkrovų eksperimentiniai tyrimai. Pateikti šių tyrimų bei skaičiavimų rezultatai, atlikta jų analizė. Asinchroninio generatoriaus, dirbančio pagal nepriklausomo žadinimo schemą, tyrimų rezultatai rodo, kad jo energetiniai rodikliai nedaug mažesni už nurodytuosius variklio rodiklius. Generatoriaus apvijomis tekant nurodytajai srovei In = 4,7 A, jo atiduodama į tinklą aktyvioji galia P2 = 2,6 kW yra 18,18 % didesnė už nurodytąją variklio galią Pn = 2,2 kW. Asinchroninio generatoriaus, dirbančio pagal susižadinimo schemą esant pastoviam jo sukimo greičiui (n = const) ir kondensatorių talpai (C = = const), tyrimai rodo, kad šio generatoriaus energetiniai rodikliai yra ženkliai mažesni už nurodytuosius variklio rodiklius. Didėjant generatoriaus apkrovai gana sparčiai mažėja jo fazinė įtampa. Generatoriaus didžiausia apkrovos srovė I1 = 2,68 A, kuri buvo išmatuota esant sukimo greičiui n = 2000 min-1 = const ir kondensatorių talpai C = 120 μF = const, yra 43 % mažesnė už nurodytąją variklio srovę. Todėl galima teigti, kad asinchroninis generatorius, dirbantis pagal susižadinimo schemą, nebus pilnai išnaudotas. Atlikti tyrimai rodo, kad asinchroninį generatorių, dirbantį pagal susižadinimo schemą, galima daugiau apkrauti didinant jo įtampą. Kad tai pasiekti, reikia, didinant generatoriaus apkrovą, atitinkamai didinti jo sukimo greitį arba (ir)... [toliau žr. visą tekstą] / The present work presents an experimental research of a three-phase induction generator which was connected using separate excitation and self-excitation schemes under various loads. The results of the research and the calculations are provided and analyzed. The research results obtained from the separately excited induction generator show that its energetic indicators are not significantly lower than the provided motor indicators. When the rated current In = 4,7 A flows through the windings of the generator, its released active power P2 = 2,6 kW is greater than the rated motor power Pn = 2,2 kW by 18,18 %. The research on a self-excited induction generator with a constant revolution speed (n = const) and capacity of its capacitors (C = const) shows that the energetic indicators of this generator are of significantly lower values than the provided motor indicators. When the load of the generator is increased, its phase voltage decreases rather rapidly. The maximum load current I1 = 2,68 A of the generator was measured under the following conditions: the rotational speed n = 2000 min-1 = const and the capacity of the capacitors C = 120 μF = const. The results showed that it was 43 % less than the rated motor current. Therefore, it can be concluded that a self-excited induction generator will not be exploited to its full capacity. The carried out research shows that it is possible to increase the load of a self-excited induction generator by increasing its voltage. It is... [to full text]

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