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11-05-2016 | Issue 6/2016

Journal of Materials Engineering and Performance 6/2016

On the Degradation Mechanism of Low-Voltage Underground Cable with Poly(Vinyl Chloride) Insulation

Journal:
Journal of Materials Engineering and Performance > Issue 6/2016
Authors:
H. M. Tawancy, M. Hassan

Abstract

A study has been undertaken to determine the degradation mechanism leading to localized short-circuit failures of an underground low-voltage cable with PVC insulation. It is shown that that the insulation of outer sheath and conductor cores has been cracked by thermal degradation involving dehydrochlorination, oxidation, and loss of plasticizers leading to current leakage between the cores. Most evidence points out that overheating due to poor connection of copper wires as well as a chemically active soil has caused the observed degradation.

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