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.
Electrical Insulation, 1998. Conference Record of the 1998 IEEE International Symposium on
Volume 1, Issue , 7-10 Jun 1998 Page(s):117 - 121 vol.1
Digital Object Identifier 10.1109/ELINSL.1998.704677
Summary: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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