Faculty of Electrical Engineering and Information Technologies

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Author: search.filters.author.Grcev, LeonidLanguage: search.filters.language.English (United States)

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    Parametric Analysis of Conductive Coupling of Transmission Line Tower Grounding and Pipeline in Multilayer Soil
    (Wydawnictwo SIGMA-NOT, sp. z.o.o., 2023-07-28)
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    Grcev, Leonid
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    Gjorgievski, Vladimir
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    Velkovski, Bodan
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    Markovska Dimitrovska, Marija
    Faults in electric power system may give rise of coating stress voltages on nearby pipelines due to mutual electromagnetic coupling. To prevent hazardous situations, accurate modelling of the electromagnetic interactions between such systems is required. In this paper, we perform parametric analysis of the effects of multilayer soil and of the effectiveness of different mitigation techniques in reducing coating stress voltages on a short pipeline section due to conductive coupling. Analyses are performed using full-wave electromagnetic model, based on the method of moments.
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    Improving the Efficiency of Grounding System Analysis Using GPU Parallelization
    (ETAI - Society for Electronics, Telecommunications, Automatics and Informatics of the Republic of North Macedonia, 2021-09-21)
    Velkovski, Bodan
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    Gjorgievski, Vladimir
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    Markovska, Marija
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    Grcev, Leonid
    Safety analyses of the effectiveness of large grounding systems are often hampered by the lengthy computation times. Using even the simplest image models, the evaluation of touch and step voltages can require from several minutes to several hours of computations on modern CPUs. Our analysis shows that substantial reduction of computation times can be achieved by utilizing GPU parallelization. In this paper we provide basic steps in the implementation of GPU parallelization on the simplest equipotential model for grounding analysis in homogeneous earth, and we test the effectiveness of this approach in different scenarios.
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    Accurate Low-Frequency Approximation for Wires within a Two-Layered Earth
    (Obuda University, 2020-12)
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    Grcev, Leonid
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    Arnautovski-Toseva, Vesna
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    Rigorous electromagnetic models and approximations are traditionally based on the Sommerfeld’s resolution for Hertz vector potentials. However, another resolution, based on transverse Hertz vector potentials, also exists. This paper shows that a low frequency approximation, based on this resolution, for wires embedded in a two-layered earth, is more accurate than the existing alternative. The accuracy of proposed approximation is validated for a range of different wire geometries, frequencies and earth characteristics.