Abstract
In this paper is presented the protection of transmission power lines of the Kosovo Power System from atmospheric discharges, with the use of surge arresters. Atmospheric discharges represent one of the main causes of interruptions for the Kosovo Power System. In addition, the ground flash density for Kosovo is given. The transmission lines with the worst performance regarding atmospheric discharges are discussed in more detail and are presented recommendations about the surge arresters used to protect the system from these overvoltages. The data provided by the localized lightning system in Kosovo enable us to provide a detailed correlation of the reported outages of the Kosovo Power System and corresponding atmospheric discharges. Recommendations for protection in terms of surge arresters are given followed by subsequent dynamic simulations using MATLAB software.
Highlights
The power system of a country and its regular operation is of high importance for a country, both in social and economic aspects
Power outages affect the daily human activities and the economic performance of a country. This is evident with the close relation of gross domestic production (GDP) on the one side and power supply on the other
From the simulation results one can see that residual voltage Ur = 310 kV is almost identical to the residual voltage that the ABB manufacturer guarantees for the class 2 PEXLIM R surge arrester type
Summary
The power system of a country and its regular operation is of high importance for a country, both in social and economic aspects. Whenever the overvoltages are present in power systems, regardless of the nature of the traveling waves, they will spread throughout the length of the line When these overvoltage waves meet in a joint or point of discontinuity, multiple reflections will occur in these locations and in this case a wave with two times greater the amplitude than the traveling overvoltage wave, will arise. Such a phenomenon should be considered during the design of high voltage equipment and lines for the coordination of isolation [1]. The direct impact of lightning poses a dangerous increase in voltage when current discharge pulse propagates through constructive elements We have analyzed this phenomenon as a very dangerous effect with reference to the power transmission lines. The study of flashovers is very important to assess the performance of the atmospheric discharges, which more strikes phase conductors than the shielding wires [2]
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