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Overvoltage Impact on Internal Insulation Systems of Transformers in Electrical Networks with Vacuum Circuit Breakers

Author

Listed:
  • Marek Florkowski

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

  • Jakub Furgał

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

  • Maciej Kuniewski

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

  • Piotr Pająk

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

Abstract

Vacuum circuit breakers are increasingly used as switching apparatus in electric power systems. The vacuum circuit breakers (VCBs) have very good operating properties. VCBs are characterized by specific physical phenomena that affect overvoltage exposure of the insulation systems of other devices. The most important phenomena are the ability to chop the current before the natural zero crossing, the ability to switch off high-frequency currents, and the rapid increase in dielectric strength recovery. One of the devices connected directly to vacuum circuit breakers is the distribution transformer. Overvoltages generated in electrical systems during switching off the transformers are a source of internal overvoltages in the windings. The analysis of the exposure of transformers operating in electrical networks equipped with vacuum circuit breakers is of great importance because of the impact on the insulation systems of switching overvoltages (SO). These types of overvoltages can be characterized by high maximum values and atypical waveforms, depending on the phenomena in the circuit breaker chambers, system configuration, parameters of electrical devices, and overvoltage protection. Overvoltages that stress the internal insulation systems are the result of the windings response to overvoltages at transformer terminals. This article presents an analysis of overvoltages that stress the transformer insulation systems, which occur while switching off transformers in systems with vacuum circuit breakers. The analysis was based on the results of laboratory measurements of switching overvoltages at transformer terminals and inside the winding, in a model medium-voltage electrical network with a vacuum circuit breaker.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6380-:d:455256
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    References listed on IDEAS

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    1. 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.
    2. Yanli Xin & Bo Liu & Wenhu Tang & Qinghua Wu, 2016. "Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms," Energies, MDPI, vol. 9(12), pages 1-16, December.
    3. 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.
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    Cited by:

    1. Huseyin R. Hiziroglu, 2023. "A Special Issue: Electric Machinery and Transformers," Energies, MDPI, vol. 16(15), pages 1-3, July.
    2. Paweł Węgierek & Michał Lech & Damian Kostyła & Czesław Kozak, 2021. "Study on the Effect of Helium on the Dielectric Strength of Medium-Voltage Vacuum Interrupters," Energies, MDPI, vol. 14(13), pages 1-14, June.

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