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Lightning Impulse Withstand of Natural Ester Liquid

Author

Listed:
  • Stephanie Haegele

    (Institute of Power Transmission and High Voltage Technology, University of Stuttgart, 70569 Stuttgart, Germany)

  • Farzaneh Vahidi

    (Institute of Power Transmission and High Voltage Technology, University of Stuttgart, 70569 Stuttgart, Germany)

  • Stefan Tenbohlen

    (Institute of Power Transmission and High Voltage Technology, University of Stuttgart, 70569 Stuttgart, Germany)

  • Kevin J. Rapp

    (Cargill Inc., Cargill Industrial Specialties—Dielectric Fluids, Plymouth, MN 55441, USA)

  • Alan Sbravati

    (Cargill Inc., Cargill Industrial Specialties—Dielectric Fluids, Plymouth, MN 55441, USA)

Abstract

Due to the low biodegradability of mineral oil, intense research is conducted to define alternative liquids with comparable dielectric properties. Natural ester liquids are an alternative in focus; they are used increasingly as insulating liquid in distribution and power transformers. The main advantages of natural ester liquids compared to mineral oil are their good biodegradability and mainly high flash and fire points providing better fire safety. The dielectric strength of natural ester liquids is comparable to conventional mineral oil for homogeneous field arrangements. However, many studies showed a reduced dielectric strength for highly inhomogeneous field arrangements. This study investigates at which degree of inhomogeneity differences in breakdown voltage between the two insulating liquids occur. Investigations use lightning impulses with different electrode arrangements representing different field inhomogeneity factors and different gap distances. To ensure comparisons with existing transformer geometries, investigations are application-oriented using a transformer conductor model, which is compared to other studies. Results show significant differences in breakdown voltage from an inhomogeneity factor of 0.1 (highly inhomogeneous field) depending on the gap distance. Larger electrode gaps provide a larger inhomogeneity at which differences in breakdown voltages occur.

Suggested Citation

  • Stephanie Haegele & Farzaneh Vahidi & Stefan Tenbohlen & Kevin J. Rapp & Alan Sbravati, 2018. "Lightning Impulse Withstand of Natural Ester Liquid," Energies, MDPI, vol. 11(8), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:1964-:d:160515
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    Citations

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    Cited by:

    1. Issouf Fofana & U. Mohan Rao, 2018. "Engineering Dielectric Liquid Applications," Energies, MDPI, vol. 11(10), pages 1-4, October.
    2. Shen, Zijia & Wang, Feipeng & Wang, Zhiqing & Li, Jian, 2021. "A critical review of plant-based insulating fluids for transformer: 30-year development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    3. Pawel Rozga & Abderrahmane Beroual & Piotr Przybylek & Maciej Jaroszewski & Konrad Strzelecki, 2020. "A Review on Synthetic Ester Liquids for Transformer Applications," Energies, MDPI, vol. 13(23), pages 1-33, December.
    4. Mardhiah Hayati Abdul Hamid & Mohd Taufiq Ishak & Nur Sabrina Suhaimi & Jaafar Adnan & Nazrul Fariq Makmor & Nurul Izzatul Akma Katim & Rahisham Abd Rahman, 2021. "Lightning Impulse Breakdown Voltage of Rice Bran Oil for Transformer Application," Energies, MDPI, vol. 14(16), pages 1-22, August.
    5. Huaqiang Li & Linfeng Xia & Shengwei Cai & Zhiqiang Huang & Jiaqi Li & Lisheng Zhong, 2021. "Influence of Molecule Structure on Lightning Impulse Breakdown of Ester Liquids," Energies, MDPI, vol. 14(4), pages 1-15, February.

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