Marek Olesz - Publications - Bridge of Knowledge

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Year 2024
Year 2023
  • Leakage Current Measurements of Surge Arresters
    Publication

    The paper presents the methods of assessing the technical condition of varistor surge arresters used in laboratory tests and in operation—performed without disconnecting the arresters from the network. The analysis of the diagnostic methods was supplemented with the results of the measurements of the leakage current of arresters coming directly from their production and used in the power industry. Among the available methods of...

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  • Ryzyko strat odgromowych a systemy fotowoltaiczne

    Artykuł opisuje wybrane zagrożenia związane z eksploatacją instalacji fotowoltaicznych oraz sposoby zmniejszania związanego z tym ryzyka. Opisano wpływ instalacji fotowoltaicznej na wzrost ryzyka strat odgromowych określony na podstawie obliczeń wykonanych za pomocą programu DEHN Risk Tool. Wykonano symulacje dla trzech przypadków: elektrownie fotowoltaiczne o różnej mocy, budynek jednorodzinny usytuowany w wybranych lokalizacjach...

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Year 2022
Year 2021
  • Electrical Tree Growth Behavior Under AC and DC High Voltage in Power Cables
    Publication
    • M. A. Saleh
    • S. S. Refaat
    • M. Olesz
    • H. Abu-Rub

    - Year 2021

    This work investigates the impact of an applied AC and DC high voltage on the electrical tree behavior in extruded cross-linked polyethylene (XLPE) insulation based on simulation and experimental validation. Extensive partial discharge (PD) testing methods are being implemented for high voltage cables under AC voltage for monitoring their condition. However, these PD testing methods cannot be utilized for power cables under DC...

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  • Inception and Propagation of Electrical Trees in the Presence of Space Charge in HVAC Extruded Cables
    Publication
    • M. A. Saleh
    • S. S. Refaat
    • M. Olesz
    • H. Abu-Rub

    - IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION - Year 2021

    This paper presents the space charge impact on the inception and propagation of electrical trees in cross-linked polyethylene (XLPE) insulation via simulations and experimentation. A 3D finite element analysis (FEA)-based modeling is proposed to simulate electrical trees via a needle embedded on the XLPE insulation. The proposed FEA model demonstrates the influence of the space charge magnitude and polarity on the initiation of...

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  • Modeling and Evaluation of Electric Treeing Phenomena in Polymeric Cable Insulation
    Publication
    • Q. Khan
    • S. S. Refaat
    • H. Abu-Rub
    • H. Toliyat
    • M. Olesz

    - Year 2021

    This paper investigates the treeing phenomenon in polymeric materials such as crosslinked polyethylene (XLPE) that is widely used in medium and high voltage power cables as primary insulation. The modeling of electrical tree growth in the insulation from its initiation to breakdown is significant research work that illustrates the discharge dynamics and its impact on aging process in polymeric insulation. This study utilizes pulse...

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  • The Effect of Protrusions on the Initiation of Partial Discharges in XLPE High Voltage Cables
    Publication

    - Bulletin of the Polish Academy of Sciences-Technical Sciences - Year 2021

    This paper is focusing on 3D Finite Elements Analysis (FEA) based modelling of protrusions as defects or imperfections in the XLPE high voltage cable. This study is aiming to examine the impact protrusions have on the initiation of partial discharges. Spherical and ellipsoidal protrusions with different sizes at the conductor screen of the high voltage cable is an essential content of this paper. In addition, a spherical gas-filled...

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  • The Impact of Thermal Stresses on Volume Resistivity: Performance Comparison between TR-XLPE and XLPE Cables
    Publication

    - Year 2021

    Most failures in electric power cables are attributed to the development of water trees inside the insulating materials. Thus, the development and utilization of Tree Retardant Cross-Linked Polyethylene (TR-XLPE) based cables have recently been given great attention to overcome the treeing issues. TR-XLPE cables use low-density polyethylene compounds suppressing the formation of water trees while retaining excellent electrical,...

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