Electrical engineering

20181112-02
Some features and opportunities for calibration of analyzers of electric power by total harmonic distortion
Plamen Tzvetkov, Krasimir Galabov, Ivan Kodjabashev

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The possibility for evaluation of the quality of electrical energy for the purpose of calibration of analyzers is considered by using a periodic square-wave pulse signal instead of the traditionally used harmonic signals. ...  read more

20181112-03
Hysteresis loss analysis of magnetic materials with data acquisition system
Ivaylo Nedelchev

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Magnetic materials are widespread in many fields of the electronics and electrical engineering. The most of them take place in the constructions of transformers, coil cores, electromagnets, measurement sensors etc. Thus, their ...  read more

20140304-05
Optimization of the structure and the distribution of the reactive power compensation in the industrial electrical supply systems
Nikolay Matanov

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The compensation of the reactive loads is fundamental for improving the quality of the industrial electrical supply and decreasing the losses of active power in the distribution grids. Regarding energy efficiency, capacitor ...  read more

20140708-08
Study of the uncertainty measuring of the detonation velocity in a waveguide of non-electric blasting system
Milka D. Vicheva, Georgi S. Stanchev

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The block-diagram of equipment for measuring the velocity of detonation in non-electrical waveguides for blasting is developed. Calibrated time intervals between two pulses corresponding to the specified distance between the ...  read more

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