Breakdown at Multiple Protrusions in SF 6 and CO 2

Odd Christian Feet, Martin Seeger, Daniel Over, Kaveh Niayesh and Frank Mauseth
Additional contact information
Odd Christian Feet: ABB Motion Norway, 0666 Oslo, Norway
Martin Seeger: Hitachi ABB Power Grids Research, 5401 Baden-Dättwil, Switzerland
Daniel Over: Hitachi ABB Power Grids Research, 5401 Baden-Dättwil, Switzerland
Kaveh Niayesh: Department of Electric Power Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Frank Mauseth: Department of Electric Power Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

Energies, 2020, vol. 13, issue 17, 1-22

Abstract: The electric breakdown at single and multiple protrusions in SF 6 and CO 2 is investigated at 0.4 and 0.6 MPa, respectively. Additionally, the breakdown fields at rough surfaces of two different areas were determined. From the measurements, breakdown probability distributions for single protrusions were determined and fitted by Weibull distributions. This allowed the determination of statistical enlargement laws for the 50% breakdown probability fields E 50 . Such enlargement laws describe, for example, the scaling of breakdown field with electrode area or number of protrusions. The predictions were compared to the experimental data, and both agreement and discrepancies were observed depending on polarity and number of protrusions and gas. Discharge predictions including first electron, streamer inception and crossing, as well as leader propagation, gave further insight to this. It was found that predictions from enlargement laws based on statistical processes may not describe the measured breakdown fields well and that relevant physical breakdown criteria must also be considered.

Keywords: gaseous breakdown; SF 6; CO 2; surface roughness; statistical enlargement laws (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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