NDLI: Time behavior and breakdown of XLPE cable models subjected to multiple stresses

Content Provider	IEEE Xplore Digital Library
Author	Montanari, G.C. Motori, A.
Copyright Year	1990
Description	Author affiliation: Istituto di Elettrotecnica Ind., Bologna, Italy (Montanari, G.C.)
Abstract	Cross-linked polyethylene (XLPE) cable models obtained by a steam curing process have been investigated. These models were subjected to life tests with electrical, thermal, and multiple thermal-electrical stresses. The tests were performed by means of the progressive-censoring procedure in order to obtain information on both failure time percentiles and aging mechanisms by the study of significant properties related to breakdown. The results of multiple-stress tests are presented, and the behavior of such properties as density, melting enthalpy, and DC electrical conductivity is investigated as a function of aging conditions, and is related to the failure times obtained from each life test. It is shown that changes occur in the material during aging under multiple stresses which are not detected at the same aging times when electrical and thermal stresses are applied singly. Moreover, failure times are strongly reduced when stresses are combined, so that the electrical threshold decreases as temperature grows and seems to disappear at temperatures higher than 100 degrees C. The appearance of heterogeneous regions in the bulk of cable models aged under multiple stresses and the time behavior of the investigated properties suggest that the breakdown is mainly due to localized phenomena, even if bulk degradation processes occur in the insulation.<>
Starting Page	257
Ending Page	260
File Size	320121
Page Count	4
File Format	PDF
ISSN	1089084X
DOI	10.1109/ELINSL.1990.109751
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-06-03
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric breakdown Thermal stresses Aging Life testing Temperature Polyethylene Curing Performance evaluation Mechanical factors Conductivity
Content Type	Text
Resource Type	Article

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