Experiments on paper insulation in a corona environment

Insertion of an insulating paper between point-plane electrodes normally increases the total breakdown potential threshold, except when its position is next to the plane. A series of DC [both (+) and (-)] experiments was designed and conducted to examine this latter distinction. It was found that vi...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2001-05, Vol.37 (3), p.772-777, Article 178
Main Authors: Lee, T.S., Fung, B.K., Zang Ming
Format: Article
Language:English
Subjects:
Breakdown
Bridge circuits
Composite materials
Corona
Dielectrics and electrical insulation
Direct current
Electric breakdown
Electrodes
Electrostatics
Experiments
Failure
Industry Applications Society
Insertion
Insulation
Ionization
Spots
Surface discharges
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Summary:Insertion of an insulating paper between point-plane electrodes normally increases the total breakdown potential threshold, except when its position is next to the plane. A series of DC [both (+) and (-)] experiments was designed and conducted to examine this latter distinction. It was found that visual ionic spots on the paper surface are a dominant prebreakdown phenomenon. Local failure at one of such discrete spots ultimately brings about a streamer sparkover in air at a sufficiently high potential. This paper describes the variability and other characteristics of the pattern in a two-dimensional spot distribution. Related experiments reveal that, with double paper layers already in the barrier, the pattern of spots becomes less dense visually but the breakdown potential would increase for the case of (+) point but would decrease further for the case of (-) point if a third sheet is introduced. A sharply defined "dark" band on the double-layer side in which glow spots are absent was always observed to clearly bridge the separate domains of, respectively, single-layer and double-layer spot distributions. Also related were the mechanical agitations of the paper accompanying all phases of the different discharge activities.
ISSN:0093-9994
1939-9367
DOI:10.1109/28.924758