8 articles in this issue
Pavel Mikhalichenko,Ivan Biliuk,Olexandr Kyrychenko,Victor Nadtochii,Anatoly Nadtochiy
All types of relay protection are based on comparing the values for certain attributes under a system's normal and emergency operational modes. A new attribute for defining the emergency mode in a direct current traction electricity supply system has been... see more
Oleksandr Plakhtii,Volodymyr Nerubatskyi,Nadiia Karpenko,Olha Ananieva,Hryhorii Khoruzhevskyi,Vitaliy Kavun
Multi-level autonomous voltage converters are increasingly used in industry, specifically: in wind and solar energy generation, high-voltage substations, in industrial and traction electric drives. In comparison with two-level inverters, multilevel invert... see more
Elena Kravets
The paper reports a three-dimensional numerical solution to the test problem about a viscous incompressible liquid flow in the closed square-shaped cavity with a movable upper face. Disadvantages in a mathematical statement of the problem about a flow of ... see more
Vladimir Zaykov,Vladimir Mescheryakov,Yurii Zhuravlov
The paper reports an established analytical relation of the time it takes for a thermoelectric cooler to enter a stationary mode depending on the thermal-physical parameters of structural and technological elements, a temperature differential, relative wo... see more
Irina Boshkova,Oleksandr Titlov,Natalya Volgusheva,Catherina Georgiesh,Tetiana Sahala
This paper reports a study of the thermoacoustic phenomena in steam-generating channels of the cooling system of heat-loaded devices. The examined cooling modes are characterized by surface boiling of the heat carrier, which occurs due to high heat flows ... see more
Budi Sugiharto,Sudjito Soeparman,Denny Widhiyanuriyawan,Slamet Wahyudi,ING Wardana
Simple design Savonius vertical-axis wind turbine can generate energy at low wind speed from any direction. However, its large static torque has a low power factor. Therefore, an innovation was made by providing 16 guide vanes around the shaft outside the... see more
Yurii Tomashevskyi,Oleksander Burykin,Volodymyr Kulyk,Juliya Malogulko
Power grids are insufficiently equipped with means of monitoring of operating parameters. The infrastructure of commercial power consumption accounting systems is the most developed. However, power consumption information is stored in the aggregated form.... see more