Surface Flashover Over a Microprofiled Cylinder in Air

Increasing the lightning impulse (LI) flashover voltage of insulators can require significant changes to the geometry and material properties of the insulator or electrodes. In some cases, such changes can be difficult to implement as they may require more volume or may compromise, for example, the...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2023-12, Vol.30 (6), p.2862-2869
Main Authors: Meyer, Hans Kristian, Marskar, Robert, Osberg, Helene G., Mauseth, Frank
Format: Article
Language:English
Subjects:
Discharge
Electric potential
Electrodes
Glass fibers
Grooves
Insulation
Insulators
Material properties
Mechanical properties
Streamer gas discharge
Surface flashover
Voltage
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Summary:Increasing the lightning impulse (LI) flashover voltage of insulators can require significant changes to the geometry and material properties of the insulator or electrodes. In some cases, such changes can be difficult to implement as they may require more volume or may compromise, for example, the mechanical properties of the insulating parts. In this work, a new microscale surface profile that inhibits streamer discharge propagation without introducing major changes to the insulation system geometry or materials is demonstrated. Polyoxymethylene (POM) cylinders with 25% glass fiber in the air were machined with [Formula Omitted] mm rectangular grooves spaced 0.6 mm apart and stressed with LIs. A nonprofiled cylinder and a cylinder with a larger, semicircular grooves were tested for comparison. The cylinders were tested in a 48.5-mm atmospheric air gap with an exposed triple junction as the positive electrode. The rectangular surface profiles increased the LI flashover voltage ([Formula Omitted]) from 70.0 to 96.5 kVpeak. High-speed imaging showed positive surface streamer discharges stopping on the surface profiles. Discharge inception calculations were used to explain the influence of the surface profile on the flashover process. The results are relevant for technological applications with electrically stressed solid insulators in gases.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2023.3277413