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Breakdown at Multiple Protrusions in SF6 and CO2

ABB Motion Norway, 0666 Oslo, Norway
Hitachi ABB Power Grids Research, 5401 Baden-Dättwil, Switzerland
Department of Electric Power Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Author to whom correspondence should be addressed.
Energies 2020, 13(17), 4449;
Received: 7 July 2020 / Revised: 12 August 2020 / Accepted: 19 August 2020 / Published: 27 August 2020
(This article belongs to the Special Issue Environmental Compatible Circuit Breaker Technologies)
The electric breakdown at single and multiple protrusions in SF6 and CO2 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 E50. 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. View Full-Text
Keywords: gaseous breakdown; SF6; CO2; surface roughness; statistical enlargement laws gaseous breakdown; SF6; CO2; surface roughness; statistical enlargement laws
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MDPI and ACS Style

Feet, O.C.; Seeger, M.; Over, D.; Niayesh, K.; Mauseth, F. Breakdown at Multiple Protrusions in SF6 and CO2. Energies 2020, 13, 4449.

AMA Style

Feet OC, Seeger M, Over D, Niayesh K, Mauseth F. Breakdown at Multiple Protrusions in SF6 and CO2. Energies. 2020; 13(17):4449.

Chicago/Turabian Style

Feet, Odd C., Martin Seeger, Daniel Over, Kaveh Niayesh, and Frank Mauseth. 2020. "Breakdown at Multiple Protrusions in SF6 and CO2" Energies 13, no. 17: 4449.

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