Diagnosis of XLPE insulated cables aged under conditions ofmultiple stresses: thermoelectric and humidity
Da Silva, E.
Ramirez, J.
Rodriguez, J.
Bermudez, J.
Ren, J.
Ferrez, A.
Davila, S.
Dept. of Conversion & Transp. of Energy, Simon Bolivar Univ., Caracas;
This paper appears in: Electrical Insulation, 1998. Conference Record of the 1998 IEEE International Symposium on
Publication Date: 7-10 Jun 1998
Volume: 1,
On page(s): 117-121 vol.1
Meeting Date: 06/07/1998 - 06/10/1998
Location: Arlington, VA, USA
ISBN: 0-7803-4927-X
References Cited: 10
INSPEC Accession Number: 6103605
Digital Object Identifier: 10.1109/ELINSL.1998.704677
Current Version Published: 2002-08-06
Abstract
This work summarizes the main results obtained when subjecting 15
kV XLPE insulated cables to degradation, under conditions of multiple
stresses (temperature, voltage, impulses of voltage and humidity). The
effect of the degradation was evaluated by analyzing the modifications
that appear in the main electric properties and microscopic
observations. The results show that the presence of humidity and the
application of impulses constitute factors highly degrading while
certain thermal cycles may collaborate in the recovery of the properties
of the insulation given that the material presents certain regenerative
characteristics associated with its own structure and morphology, mainly
in the initial stages of the process. Additionally, it was verified that
the presence of humidity in the exterior of the cables constitutes the
necessary input for the development of water trees and that it leads, in
a parallel way, to a reduction of the deformations in the insulation
that appear by thermal expansion
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