This article deals with the basic mechanism of aging, that is water treeing (WT), that takes place in polymer-insulated power cables. WT was studied by means of computer-aided video-enhanced microscopy, microspectrophotometry, and micromanipulation. The microdiagnostics procedure was used for cables operating in a wet environment. A phenomenological WT model aimed at estimating the residual lifetime, which considers WT as a diffusionwith-reaction process, was developed. The theoretical calculations were in reasonable agreement with the experimental data.
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