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Metallic Particle Motion and Breakdown at AC Voltages in CO 2 /O 2 and SF 6

Author

Listed:
  • Lise Donzel

    (Hitachi Energy Research, 5401 Baden, Switzerland)

  • Martin Seeger

    (Hitachi Energy Research, 5401 Baden, Switzerland)

  • Daniel Over

    (Hitachi Energy Research, 5401 Baden, Switzerland)

  • Jan Carstensen

    (Hitachi Energy Research, 5401 Baden, Switzerland)

Abstract

This study deals with gaseous insulation contaminated by free moving particles. Two gases were investigated: SF 6 (0.45 MPa) and a CO 2 /O 2 gas mixture (0.75 MPa). Video recordings were used to track a free particle moving between a plate and a Rogowski electrode for validation of a 1D particle motion model. The effect of fixed and free particles (4 or 8 mm, Ø 0.9 mm) on the breakdown voltage and the mean time between breakdowns was determined in a concentric set of electrodes. The value of the breakdown voltage for a free particle was between those of a particle fixed to the enclosure and the central electrode. The particle motion in the concentric case could not be observed in the experimental set-up and was therefore simulated using a 1D model. For the 4 mm free particle, the breakdown seemed to be initiated in the inter-electrode gap in CO 2 and at the crossing in SF 6 , while for the 8 mm particle, breakdown occurred at lift-off in both gases. A parameter k describing the width of the time to breakdown distribution was introduced. A low value of k was associated with the breakdown from the particles at the electrodes, while k was larger than 10 when the breakdown was decided during particle flight.

Suggested Citation

  • Lise Donzel & Martin Seeger & Daniel Over & Jan Carstensen, 2022. "Metallic Particle Motion and Breakdown at AC Voltages in CO 2 /O 2 and SF 6," Energies, MDPI, vol. 15(8), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2804-:d:791962
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    References listed on IDEAS

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    1. Phillip Widger & Daniel Carr & Alistair Reid & Meirion Hills & Chris Stone & A. (Manu) Haddad, 2020. "Partial Discharge Measurements in a High Voltage Gas Insulated Transmission Line Insulated with CO 2," Energies, MDPI, vol. 13(11), pages 1-11, June.
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