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Analysis of Internal Overvoltages in Transformer Windings during Transients in Electrical Networks

Author

Listed:
  • Jakub Furgał

    (Power Electrical Engineering Division, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland)

  • Maciej Kuniewski

    (Power Electrical Engineering Division, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland)

  • Piotr Pająk

    (Power Electrical Engineering Division, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland)

Abstract

Due to the increasing requirements for the reliability of electrical power supply and associated apparatus, it is necessary to provide a detailed analysis of the overvoltage risk of power transformer insulation systems and equipment connected to their terminals. Exposure of transformer windings to overvoltages is the result of the propagation condition of electromagnetic waves in electrical networks and transformer windings. An analysis of transformer winding responses to transients in power systems is of particular importance, especially when protection against surges by typical overvoltage protection systems is applied. The analysis of internal overvoltages in transformers during a typical transient related to switching operations and selected failures is of great importance, particularly to assess the overvoltage exposure of insulation systems in operating conditions. The random nature of overvoltage phenomena in electrical networks implies the usage of computer simulations for the analysis of overvoltage exposures of electrical devices in operation. This article presents the analysis of the impact of transient phenomena in a model of a medium-voltage electrical network during switching operations and ground faults on overvoltages in the internal insulation systems of transformer windings. The basis of the analysis is simulations of overvoltages in the windings, made in the Electromagnetic Transients Program/Alternative Transients Program (EMTP/ATP) using a model with lumped parameters of transformer windings. The analysis covers the impact of the cable line length and the ground fault resistance value on internal overvoltage distributions.

Suggested Citation

  • Jakub Furgał & Maciej Kuniewski & Piotr Pająk, 2020. "Analysis of Internal Overvoltages in Transformer Windings during Transients in Electrical Networks," Energies, MDPI, vol. 13(10), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:10:p:2644-:d:361729
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    References listed on IDEAS

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    1. Marek Florkowski & Jakub Furgał & Maciej Kuniewski, 2020. "Propagation of Overvoltages in the Form of Impulse, Chopped and Oscillating Waveforms in Transformer Windings—Time and Frequency Domain Approach," Energies, MDPI, vol. 13(2), pages 1-16, January.
    2. Gang Liu & Yaxun Guo & Yanli Xin & Lei You & Xiaofeng Jiang & Ming Zheng & Wenhu Tang, 2018. "Analysis of Switching Transients during Energization in Large Offshore Wind Farms," Energies, MDPI, vol. 11(2), pages 1-13, February.
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    Cited by:

    1. Mahdi Pourakbari-Kasmaei & Farhan Mahmood & Matti Lehtonen, 2020. "Optimized Protection of Pole-Mounted Distribution Transformers against Direct Lightning Strikes," Energies, MDPI, vol. 13(17), pages 1-34, August.
    2. Marek Florkowski & Jakub Furgał & Maciej Kuniewski & Piotr Pająk, 2020. "Overvoltage Impact on Internal Insulation Systems of Transformers in Electrical Networks with Vacuum Circuit Breakers," Energies, MDPI, vol. 13(23), pages 1-14, December.
    3. Bojan Trkulja & Ana Drandić & Viktor Milardić & Igor Žiger, 2021. "Evaluation of Methodology for Lightning Impulse Voltage Distribution over High-Voltage Windings of Inductive Voltage Transformers," Energies, MDPI, vol. 14(16), pages 1-15, August.
    4. Łukasz Majka & Bernard Baron & Paweł Zydroń, 2022. "Measurement-Based Stiff Equation Methodology for Single Phase Transformer Inrush Current Computations," Energies, MDPI, vol. 15(20), pages 1-19, October.

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