Estimation of Water Content in Cross-Linked Polyethylene Insulated Cables by Fourier Transform Infrared Spectroscopy

Authors: Haridoss, S.1; Tobazéon, R.2; Crine, J.-P.1

Source: Applied Spectroscopy, Volume 42, Issue 1, Pages 1-193 (January 1988) , pp. 186-188(3)

Publisher: Society for Applied Spectroscopy

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Abstract:

Water has deterimental effects on electrical properties of polymeric insulation, such as increasing dielectric losses and reducing short-term and long-term breakdown voltage. In polyethylene (PE) insulated power cables the combined action of the ac electric field and the conducting water produces localized degradation which has a tree-like structure (a few microns in size) called water treeing. Water is introduced into the insulation either by the manufacturing process or during handling, installation, and operation. In steam-cured cross-linked PE(XLPE) cables, water condenses in the form of microscopic cavities or clusters in amounts exceeding its solubility limit in PE, giving rise to the presence of a "halo." A knowledge of total water content and its interaction with PE matrix is therefore of prime importance for the understanding of the performance of the cable insulation.

Keywords: Infrared; Water content

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702884428518

Affiliations: 1: Institut de recherche d'Hydro-Québec, 1800 montée Ste-Julie, Varennes, Québec JOL 2PO, Canada 2: Institut de recherche d'Hydro-Québec, 1800 montée Ste-Julie, Varennes, Québec JOL 2PO, Canada; present address: Laboratoire d'Électrostatique et des Matériaux di-électriques, CNRS, 166X-38042, Grenoble, Cedex, France

Publication date: January 1, 1988

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