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Clarifications on the Behavior of Alternative Gases to SF 6 in Divergent Electric Field Distributions under AC Voltage

Author

Listed:
  • Houssem Eddine Nechmi

    (Advanced High Voltage Engineering Research Centre, School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK)

  • Michail Michelarakis

    (Advanced High Voltage Engineering Research Centre, School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK)

  • Abderrahmane (Manu) Haddad

    (Advanced High Voltage Engineering Research Centre, School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK)

  • Gordon Wilson

    (National Grid House, (Floor C3), Warwick Technology Park, Gallows Hill, Warwick CV34 6DA, UK)

Abstract

Negative and positive partial discharge inception voltages and breakdown measurements are reported in a needle-plane electrode system as a function of pressure under AC voltage for natural gases (N 2 , CO 2 , and O 2 /CO 2 ), pure Novec TM gases (C 4 F 7 N and C 5 F 10 O) and Novec TM in different natural gas admixtures. For compressed 4% C 4 F 7 N–96% CO 2 and 6% C 5 F 10 O–12% O 2 –82% CO 2 gas mixtures, the positive-streamer mode is identified as the breakdown mechanism. Breakdown and negative partial discharge inception voltages of 6% C 5 F 10 O–12% O 2 –82% CO 2 are higher than those of 4% C 4 F 7 N–96% CO 2 . At 8.8 bar abs, the breakdown voltage of 6% C 5 F 10 O–12% O 2 –82% CO 2 is equal to that of 12.77% O 2 –87.23% CO 2 (buffer gas). Synergism in negative partial discharge inception voltage/electric field fits with the mean value and the sum of each partial pressure individually component for a 20% C 4 F 7 N–80% CO 2 and 6% C 5 F 10 O–12% O 2 –82% CO 2 , respectively. In 9% C 4 F 7 N–91% CO 2 , the comparison of partial discharge inception electric fields is E max (CO 2 ) = E max (C 4 F 7 N), and E max (12.77% O 2 –87.23% CO 2 ) = E max (C 5 F 10 O) in 19% C 5 F 10 O–81%(12.77% O 2 –87.23% CO 2 ). Polarity reversal occurs under AC voltage when the breakdown polarity changes from negative to positive cycle. Polarity reversal electric field E PR was quantified. Fitting results show that E PR (CO 2 ) = E PR (9% C 4 F 7 N–91% CO 2 ) and E PR (SF 6 ) = E PR (22% C 4 F 7 N–78% CO 2 ). E PR (4% C 4 F 7 N–96% CO 2 ) = E PR (12.77% O 2 –87.23% CO 2 ) and E PR (6% C 5 F 10 O–12% O 2 –82% CO 2 ) < E PR (4% C 4 F 7 N–96% CO 2 ) < E PR (CO 2 ).

Suggested Citation

  • Houssem Eddine Nechmi & Michail Michelarakis & Abderrahmane (Manu) Haddad & Gordon Wilson, 2021. "Clarifications on the Behavior of Alternative Gases to SF 6 in Divergent Electric Field Distributions under AC Voltage," Energies, MDPI, vol. 14(4), pages 1-23, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:1065-:d:501310
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    References listed on IDEAS

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    1. Michail Michelarakis & Phillip Widger & Abderrahmane Beroual & Abderrahmane (Manu) Haddad, 2019. "Electrical Detection of Creeping Discharges over Insulator Surfaces in Atmospheric Gases under AC Voltage Application," Energies, MDPI, vol. 12(15), pages 1-15, August.
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