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Документ Lightning-induced overvoltages in overhead lines with shielded wires of medium voltage classes(Serednyak T. K., 2023) Dryvetskyi, S. I.; Danylchenko, D. O.; Shevchenko, S. Yu.The monograph is devoted to the solution of an actual scientific and applied problem in the field of lightning protection of overhead power lines with protected wires of medium voltage classes from lightning-induced overvoltages that occur during lightning strikes near the power transmission line. Currently, shielded wires for overhead lines are becoming more and more widespread in Ukraine. The use of wires in a protective sheath has several significant advantages, namely: reliability, economic feasibility. Damage in distribution networks causes most of the damage associated with interruptions in the electricity supply to consumers. One of the main causes of accidents and disturbances is lightning overvoltages on overhead lines, which cause impulse overlaps and destruction of insulators and lead to arcing and disconnection of lines. Due to the low impulse strength, the insulation of distribution networks is prone to overlaps both during direct lightning discharges and from inductive overvoltages during lightning discharges near the line. The latter are the main cause of lightning shutdowns and equipment damage of 6-35 kV networks, making up to 90% in some cases. Thus, the reliability of electricity supply to consumers largely depends on the effectiveness of lightning protection measures.Документ Protection of 6-35 kV overhead power lines against direct lightning strikes(Serednyak T. K., 2023) Danylchenko, D. O.; Dryvetskyi, S. I.; Shevchenko, S. Yu.The monograph is devoted to the solution of an actual scientific and applied problem in the field of lightning protection of overhead power lines with protected wires of medium voltage classes from direct lightning strikes. The paper experimentally proved that protected wires are less likely to be affected by direct lightning strikes than non-insulated wires. This is due to the protective sheath of the protected wires, since the conditions for the occurrence of an oncoming conductor become much more complicated, and the area of lightning capture is significantly reduced. Current methods of calculating the number of direct lightning strikes do not take into account the type of wire on overhead lines, which leads to incorrect calculations of the number of direct lightning strikes and, as a result, the number of line shutdowns. The obtained results made it possible to create a new approach to lightning protection of overhead lines with protected wires, to create a combined power transmission line. This line contains in its design protected wires and a non-insulated wire, which performs the role of a lightning protection wire. The created model of the combined line was tested experimentally, not a single lightning strike to the protected wires was recorded.Публікація Optimization of Storage Systems According to the Criterion of Minimizing the Cost of Electricity for Balancing Renewable Energy Sources(2020) Fedorchuk, S. O.; Ivakhnov, A. V.; Danylchenko, D. O.The article is devoted to the issues of integration of renewable sources into existing energy systems. The main stages of this process, problems associated with them and the ways to solve are considered. The method of choosing the configuration of the accumulation system is proposed and the result of calculating the cost of 1 kWh from accumulation system is applied to the main stages of using accumulation.Документ Overview of selection methods for surge arresters 6-750 kV(2020) Shevchenko, S. Yu.; Danylchenko, D. O.; Pirotti, O. Ye.; Minakova, K. O.The article focuses on the correct choice of equipment overvoltage protection devices using a surge arrester. Regulatory documents on the selection of surge arresters in different countries and the methods recommended by leading manufacturers of surge arresters are considered. The main parameters for the selection of surge arresters are considered. The main parameter of the surge arrester is considered in detail - the maximum long-term permissible operating voltage. Special attention is paid to the selection of surge arresters for switching and lightning overvoltage. The choice of an overvoltage arrester based on the explosion hazard condition and mechanical characteristics is also considered.Документ Technical-economic justification electric network 110 kV(Aladdin-print, 2021) Danylchenko, D. O.; Dryvetskyi, S. I.; Cherkashyna, V. V.; Shevchenko, S. Yu.The implementation of the course project for the course "Electrical Systems and Networks" is an important stage in the training of electric power specialists, which is due to the need for a comprehensive review and solution in these developments of a large group of technical and economic issues related to the operation of electric networks. The guidelines contain information about the order of the course project, the main ratios for performing electrical and technical and economic calculations, recommendations on the use of standard design solutions.Документ Electrical systems and networks(2019) Danylchenko, D. O.; Dryvetskyi, S. I.; Cherkashyna, V. V.; Shevchenko, S. Yu.Designed to clarify the sequence of calculating the course project in the discipline "Electrical Systems and Networks" students of foreign education. The basic disciplines for successful mastering of the program material during the practical training are: algorithmization and software, theory of automatic control, distribution electrical networks. These guidelines provide for the formation of the following competencies: the ability to improve existing technological systems and find the best methods for their operation; ability to carry out research by methods of classical sciences, planning, organize and carry out scientific researches in the field of electric power, electrical engineering and electromechanics.Документ Using a phase-differential busbar protection for switchgears of power system facilities(Національний гірничий університет, 2019) Kulagin, D. O.; Fedosha, D. V.; Nitsenko, V. V.; Shevchenko, S. Yu.; Danylchenko, D. O.Purpose. To develop a concept for the implementation of a more advanced device designed for the busbar protection of power plants and substations which has advantages in technical operation over its traditional analogs by applying the phase-differential principle of this protection. Methodology. When developing the concept of implementation of phase-differential busbar protection, we used the method of comparative analysis, in particular, a qualitative analysis of the characteristics of busbar protection was carried out; difficulties encountered in the operation of traditional differential protection as well as advantages that can be obtained by introducing phase differential protection were considered in the work. Findings. Based on many years’ experience in the operation of differential current protection at power system facilities, the problematic issues of its operation are identified. We suggest using the phase-differential principle for busbar protection operation; its distinctive features are distinguished in comparison with traditional protections. The conditions for starting, tripping and returning of the phase-differential protection are determined, and there is suggested a method for determining the sensitivity of phase relay concerned to the angle. The phase characteristic of the protection is shown, which is the major operating characteristic which determines the width of the working zone and the blocking of this protection type. Originality. For the first time, use of phase-differential busbar protection, the principle of which is based solely on comparing the phases of the secondary currents of bays, connected to the common busbar system, has been suggested. At the same time, there is no provision for the use of any additional protection relays, which can provide a protection starting and use a different principle of operation from the phase-differential one. Practice value. The phase-differential busbar protection relay can be accepted into the technical operation in the power system facilities as an alternative option of using the traditional differential current protection. It has a number of advantages and allows solving existing problems of protection operation caused by increased requirements for current transformers in differential busbar protection circuits, necessity of tedious calculations of its, рабочих уставок, information redundancy and complexity of modern digital relays, which perform the function of phase-differential protection.