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Schemat zastępczy obwodu magnetycznego głównego transformatorów wielouzwojeniowych, trójkolumnowych

Noga M., Gołębiowski L., Gołębiowski M., Mazur D.

Maszyny Elektryczne : zeszyty problemowe

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2009

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Nr 83

101-110

EN

It was presented how to design three column substitute diagram of the main magnetic circuit using the impedance matrix of the autotransformer obtained by FEM 3D methods [1, 6, 7]. Relation between main inductances of the magnetic circuit and angular frequency caused by eddy currents in the autotransformer plates was modeled by additional windings on columns short-circuited by admittances. These admittances were synthesized by Cauer ladder schemes. Magnetic saturation of the columns in the substitute diagram should be considered using traditional methods. The substitute diagram presented in this article should be complemented by ladder circuits, which synthesize zero component inductance and leakage inductance [8] of the transformer. Then the diagram can be used for fast calculations of the transient states in clean power multipulse rectifiers circuits. This way of calculations represents proper conditions of the diodes commutation and allows for studying of the circuits higher harmonics.

2

Indukcyjność rozproszenia transformatorów wielouzwojeniowych, trójkolumnowych

Lewicki J., Gołębiowski L., Gołębiowski M., Mazur D.

Maszyny Elektryczne : zeszyty problemowe

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2009

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Nr 83

111-117

EN

Commutation processes in power electronic converters are significantly dependent on the leakage inductances of the transformer. The calculations of the leakage inductance matrix where preformed with use of the finite element method (3D). The eddy current losses were taken into consideration. The mono harmonic calculations for different frequencies where performed. The dependence of magnetical inductance main, component zero and leakage were showed from frequency. This caused rotational currents in the core of the autotransformer and in the conductors of windings is. The way of the fusion of these inductances was introduced ladder arrangements. Adaptation of these inductances to the calculations of courses transitory converters district methods was the aim. The article presents ladder circuits, which synthesize zero component inductance and leakage inductance of the transformer. They are also used to complement [8] (remove imperfection) substitute diagram of the main magnetic circuit of the transformer. Including the substitute diagram they can be used for fast calculations of the transient states in clean power multi-pulse rectifiers circuits. This way of calculations represents proper conditions of the diodes commutation and allows for studying of the circuits higher harmonics.

3

Trójwymiarowa analiza pola strumienia jarzmowego w transformatorze trójkolumnowym za pomocą metody elementów skończonych MES

Tomczuk B., Koteras D.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

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2000

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z. 50

29-43

PL

W pracy wykonano obliczenia indukcji pola magnetycznego w transformatorze 3-fazowym, trójkolumnowym. Obliczenia trójwymiarowe przeprowadzono z wykorzystaniem komputerowego pakietu OPERA-3D. Dyskretyzację obliczeniowego obszaru wykonano z użyciem prostopadłościennych elementów skończonych. Wyniki obliczeń porównano z wartościami pomiarów punktowych indukcji w otoczeniu rdzenia i uzwojeń.

EN

Magnetics flux density values of the leakage field in the three-phase, threecolumn transformer have been calculated. The 3-D calculations nave been carried out with using the OPERA-3D computer package.The diskretization of the calculated area has been done with using brick finite elements.The calculation results have been compared with the measured values of the magnetic flux densit