Izolacijski sustav kombiniranih mjernih transformatora
| Autor: | Poljak, Miroslav |
|---|---|
| Přispěvatelé: | Štih, Željko |
| Jazyk: | chorvatština |
| Rok vydání: | 2006 |
| Předmět: |
combined transformer
voltage distribution Elektrotehnika insulation system udc:621.3(043.3) udarni napon namot transformatora napon nastanka parcijalnih izbijanja power-frequency voltage TEHNIČKE ZNANOSTI. Elektrotehnika. Elektrostrojarstvo raspodjela napona TECHNICAL SCIENCES. Electrical Engineering. Electromechanical Engineering mjerni transformator numerical calculation kombinirani transformator Weibullova distribucija izolacijski sustav napon industrijske frekvencije numerički proračun instrument transformer PD inception voltage transformer winding Electrical engineering Weibull distribution impulse voltage |
| Popis: | U radu su razmotrene osnovne znaajke kombiniranih transformatora i izdvojene njihove tehnike i ekonomske prednosti. Posebno su istaknute prednosti vlastite koncepcije kombiniranih transformatora s jedinstvenim izolacijskim sustavom. Metodologija prorauna izolacijskog sustava kombiniranih transformatora ukljuivala je istraživanje parcijalnih izbijanja na modelima papirno uljne izolacije s ciljem da se procijeni starenje izolacije, a rezultati istraživanja statistiki su obraeni pomou Weibullove distribucije. Definiran je matematiki model aktivnog dijela kombiniranog transformatora za proraun naponskih naprezanja u niskofrekventnom i visokofrekventnom podruju. Valorizirano je nekoliko naina odreivanja nadomjesnih ulaznih parametara modela. Za to su korištene mjerne metode, metode izrauna na temelju analitikih izraza i konano numeriki 2D i 3D prorauni metodom konanih elemenata. Za usvojeni model opisani su prorauni raspodjele izmjeninog napona industrijske frekvencije, te atmosferskog i sklopnog udarnog napona uzduž visokonaponskog namota kombiniranog transformatora. Na primjeru kombiniranog transformatora za najviši napon opreme 420 kV, detaljno je opisan postupak iznalaženja zadovoljavajueg projektnog rješenja pri emu su proraunski rezultati usporeeni s rezultatima mjerenjima. Pokazano je da se ti rezultati izuzetno dobro meusobno slažu. Prototip transformatora, izraen na temelju istraživanja opisanih u disertaciji, zadovoljio je propisana tipska i komadna ispitivanja. U nastavku je dan prijedlog projektnog rješenja kombiniranog transformatora za najviši napon opreme 550 kV. The main features of combined transformers are considered, and their technical and economical advantages singled out. It is pointed in particular to the advantages of Konar’s own concept of combined transformers with a integral insulation system. The methodology of calculation of combined transformer insulation system includes an investigation of partial discharges on models of oil-paper insulation with a view to assessing insulation ageing, and its results have been statistically processed applying Weibull distribution. A mathematical model of the active part of combined transformers has been defined for calculation of voltage stress in both low-frequency and high frequency ranges. Several modes of determination of equivalent input parameters of the model have been evaluated. For that purpose measurement methods, calculation methods based on analytical expressions, and finally numerical 2D and 3D computations based on finite elements method were used. For the adopted model, computations of the distribution of power-frequency voltage, and of lightning and switching impulse voltages along the highvoltage winding of the combined transformer are described. On the example of a combined transformer for the highest voltage for equipment of 420 kV, the procedure for finding a satisfactory design solution is described in detail, comparing computation and measurement results. It is shown that these results are in exceptionally good agreement. A prototype of the transformer made on the basis of investigations described in this thesis has passed the prescribed routine and type tests. A design solution for a combined transformer for the highest voltage for equipment of 550 kV is given as well. |
| Databáze: | OpenAIRE |
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