Electrical Treeing in Fluoropolymer Cable Insulation
Ve, Torbjørn Andersen; Syvertsen, Hilde Marie Tollefsrud; Thomsen, Nina Marie; Ese, Marit-Helen Glomm; Kantar, Emre; Hvidsten, Sverre
Peer reviewed, Journal article
Accepted version
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Date
2024Metadata
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Original version
10.1109/TDEI.2024.3405902Abstract
This paper examines the electrical treeing phenomenon in fluoropolymers under AC voltage. A specialised test setup was designed to evaluate two distinct fluoropolymers, fluorinated ethylene propylene (FEP) and perfluoroalkoxy alkane (PFA), with cross-linked polyethylene (XLPE) serving as the reference material, given its well-documented AC treeing characteristics. Tree growth in both fluoropolymers were found to follow a somewhat classical three-stage pattern, developing bush-like trees with insulating channels. In XLPE at the same growth voltage the trees were bush-branched with a higher propagation rate than in FEP and PFA. The lower propagation rate in fluoropolymers is likely related to the higher bond strength of the carbon-fluorine bonds compared to the carbon-hydrogen bonds in XLPE. Breakdown in the materials produced indications of carbonisation products in the breakdown channel.