Electrical engineering

20140910-06
Development and application of induction and resistive electrical heating systems for industrial pipelines
Alexander B. Kuvaldin, Maxim A. Fedin, Michail L. Strupinskiy, Nikolay N. Khrenkov

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This paper examines problems of calculation of heating units for ferromagnetic steel in weak electromagnetic fields. Such installations are low-temperature induction heating installations. In these plants, the electromagnetic ...  read more

20140910-05
Network voltage distortion by arc furnace and its mitigation
Sergey E. Ryvkin, Danil A. Drozhzhin

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Electric arc furnace (EAF) is the most dangerous type of load for power systems. It causes different kinds of distortion due to its frequently variable character. Nowadays there are different types of arc furnaces. This article ...  read more

20150304-06
A model of a single-phase synchronous generator with rare earth magnets
Nikola Georgiev

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This paper makes a study of a single-phase synchronous 16-pole generator with axial magnetic field and rare earth magnets. A model of the synchronous generator has first been developed, taking into consideration its geometric ...  read more

20150506-06
A study on glare in a sports lighting environment using LED lighting and diffusion plates
Takeshi Tanaka, Koji Mukai, Masayuki Yamauchi, Masao Kochi, Atsushi Ikeda, Hideo Kuzuhara, Koichi Matsushita, Go Hironobu

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Illumination sources have been rapidly shifting in recent years to light-emitting diodes (LED), which are capable of producing more than 10,000 cd/m2 at maximum luminance. This light intensity is far greater than ...  read more

20150506-05
Experimental study of the contact resistance of crossed cylindrical reinforcing steel bars
Denitsa Darzhanova, Marina Manilova, Kostadin Milanov

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In the paper experimental results for the contact resistance between two cross-pressed cylindrical bars of reinforcing steel bars are presented. The diameters of the investigated samples were from 6 to 10 mm. At a DC measurement ...  read more

20150506-04
System for intelligent measuring, registering and control in electrical substation
Rosen Vasilev, Vladimir Chikov, Valentin Gyurov, Ivaylo Nedelchev, Stoyan Tashev, Asen Krastilev, Tzvetan Alistarov, Natalia Nikolova

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Тhe paper presents novel idea for construction of intelligence systems for measurements, data collection and control in MV/LV substations. The technical solution is based on developed microprocessor control systems. The system ...  read more

20150506-03
Derivation and analysis of ceramic materials based on BaTiO3 by using standard ceramic technology
Valentin Kolev, Anka Zeglova, Ivailo Lazarov

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Ceramic materials based on BaTiO3 have been derived by using a standard ceramic technology. Various quantities of H3BO3 and Bi3O3 have been added in order to lower the ...  read more

20150506-02
Optimally designed energy efficient transformer using global iterative algorithms
Mihail Digalovski, Goran Rafajlovski, Krste Najdenkoski

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The reduction of total losses for transformers is of great importance both from economic and environmental aspects. In the paper two optimization techniques, Global Search and Pattern Search, to minimize the total power losses ...  read more

20150506-01
Analytical approach for calculation of the electric field induced by an axisymmetric current exciter
Ilonka T. Lilyanova

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In the paper is presented an analytical approach for calculation of the electric field induced by an axisymmetric current exciter. The region in which the field is determined may have an arbitrary shape. The approach is based ...  read more

20150708-07
Modeling of electromagnetic and thermal processes occurring in induction heating cooker
Maik Streblau

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Induction heating is a famous technology and very usually used for cooking appliances because of its high-energy efficiency. A mathematical model is adopted for a flat inductor-detail system in this paper and it is used for ...  read more