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eng FEM modelling and experimental validation of proximity loss
Zurek, Stan
Transformers Magazine Vol. 4, No. 1, 2017
Skin depth and proximity effects in transformer windings are important phenomena influencing the design even at power frequencies (50-60 Hz). They become critically important at elevated frequencies, especially for high-frequency transformers. This article presents results of computer simulations and experimental validation on physical prototypes. The investigated frequency range was from 1 Hz to 10 kHz.
Hrčak ID: 172548


eng Qualitative FEM study of proximity loss reduction by various winding configurations – Part II
Zurek, Stan
Transformers Magazine Vol. 3, No. 2, 2016
Skin depth and proximity effects in transformer windings are important phenomena influencing the design even at power frequencies (50-60 Hz). However, they become critically important at elevated frequencies, especially for high-frequency transformers, operating in switched-mode power supplies for example, at any power level. This article presents a numerical study of optimum winding configurations which can drastically reduce the proximity effects. It is possible to make transformers operating even at 1 MHz without the use of very expensive Li...
Hrčak ID: 167664


eng Qualitative FEM study of proximity loss reduction by various winding configurations – Part I
Zurek, Stan
Transformers Magazine Vol. 3, No. 1, 2016
Skin depth and proximity effects in transformer windings are important phenomena influencing the design even at power frequencies (50-60 Hz). However, they become critically important at elevated frequencies, especially for high-frequency transformers, operating in switched-mode power supplies for example, at any power level. This article presents a numerical study of optimum winding configurations which can drastically reduce the proximity effects. It is possible to make transformers operating even at 1 MHz without the use of very expensive Li...
Hrčak ID: 180201


eng The main reasons for increased copper losses with slags from vanyukov furnace
Dyussebekova, M. A.; Kenzhaliyev, B. K.; Kvyatkovskiy, S. A.; Sit’ko, E. A.; Nurkhadianto, D.
Metalurgija Vol. 60, No. 3-4, 2021
The article examines the factors affecting to the loss of copper with slags during autogenous smelting of copper concentrates at the Balkhash copper smelting plant (BCP). The composition of concentrates processed in the Vanyukov furnace was analyzed. Slag formation during alloying FeO with ores containing approximately the same amount of SiO<sub>2</sub> was studied. The fluxing ability of silicate ore used in charge smelting at BCP has been determined. A scanning electron microscope (SEM) was used to study the distribution of elements in the sl...
Hrčak ID: 256045