SF6 Breakdown in Cylindrical Field with dc Voltage.

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Ermel, Michael
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ELECTRIC INSULATING MATERIALS - Gases;
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Investigations were made in a coaxial cylinder system at high dc-voltages up to 900 kV and at high gas pressures up to 6 bar. The SF//6-breakdown-behavior can be classified into three regions according to the following aspects: I) breakdown after steady corona discharges, II) validity of the similarity law for the discharge onset voltage, III) deviations of the similarity law with a marked polarity effect. Possible explanations are given for the polarity effect and the deviations in region III. The results can be of importance for a future application of SF//6-insulation in HVDC systems.
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页码:505 / 510
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