NDLI: Severe degradation of the conductor screen of service and laboratory aged medium voltage XLPE insulated cables

Content Provider	IEEE Xplore Digital Library
Author	Hvidsten, S. Kvande, S. Ryen, A. Larsen, P.
Copyright Year	1994
Abstract	The main purpose of this paper is to show the strong correlation between corrosion of the metallic aluminum conductor and the formation of interconnected cracks / voids in the conductor screen, creating initiation sites for vented water trees in service aged medium voltage XLPE cables. The results show that porous structures in the conductor screen previously reported for laboratory aged insulation systems, also develop in the conductor screen in service aged medium voltage XLPE cables. These structures can bridge the screen and serve as path for contaminants and corrosion products from the aluminum conductor and initiate water trees. A prerequisite for the formation of such structures is the presence of liquid water at the interface between the conductor and conductor screen causing corrosion. The initiation site of such structures has been identified, and is likely caused by environmental stress cracking (ESC). Initiation sites were determined in all cables, but porous structures in the conductor screen were only observed in the cable suffered from service failure, where liquid water had entered the cable conductor between the strands. Severe degradation of the XLPE insulation was observed at the initiation sites for water trees growing from these structures.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
Starting Page	155
Ending Page	161
Page Count	7
File Size	821263
File Format	PDF
ISSN	10709878
Volume Number	16
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Conductors Laboratories Aging Medium voltage Cable insulation Cables Corrosion Trees - insulation Aluminum Conductor screen, degradation, medium voltage cable, water treeing.
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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Initiation of vented water trees from the conductor screen of MV XLPE insulated cables

Comparison of diagnostic test techniques on laboratory aged water treed MV-XLPE cables

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Water treeing of XLPE cables during dynamic mechanical tension

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Severe degradation of the conductor screen of service and laboratory aged medium voltage XLPE insulated cables

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