2017
DOI: 10.1109/tdei.2016.006244
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Evaluation of relationship between residual charge signal and AC breakdown strength of water-tree degraded 22 to 77 kV classes XLPE cables removed from service using pulsed voltages

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Cited by 10 publications
(5 citation statements)
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“…Nevertheless, there is, so far, no comprehensive explanation and clarified mechanism of water-tree initiation and propagation. Insulation defects and internal electric field distortion in crosslinked polyethylene (XLPE) material under thermal-water environments are dominant triggers leading to water-tree aging of electric insulation [ 1 , 2 ]. The electric field strength at water-tree terminals gradually increases with aging time, resulting in serious local discharge, which forms electric-trees and finally causes dielectric breakdown of XLPE main insulation in power cables.…”
Section: Introductionmentioning
confidence: 99%
“…Nevertheless, there is, so far, no comprehensive explanation and clarified mechanism of water-tree initiation and propagation. Insulation defects and internal electric field distortion in crosslinked polyethylene (XLPE) material under thermal-water environments are dominant triggers leading to water-tree aging of electric insulation [ 1 , 2 ]. The electric field strength at water-tree terminals gradually increases with aging time, resulting in serious local discharge, which forms electric-trees and finally causes dielectric breakdown of XLPE main insulation in power cables.…”
Section: Introductionmentioning
confidence: 99%
“…Water molecules will gradually infiltrate XLPE insulation layer through structural defects to form water-trees under alternative current (AC) electric field, which will even transform into or trigger electrical-trees [ 5 , 6 ]. Although water-trees cannot immediately cause substantial damage to the insulation layer of power cables, it will continuously expand to increase dielectric loss and decrease electrical breakdown field until insulation failure, which degrades the cable life and the reliability of power supply [ 7 , 8 ]. Water-tree aging is one of the main factors leading to the deterioration of XLPE insulation.…”
Section: Introductionmentioning
confidence: 99%
“…In wet environments, the micro-water beads around the power cable will gradually penetrate into the XLPE insulation layer and form water-trees under an electric field [ 2 ]. Although the formation of water-trees will not immediately cause cable insulation failure, water-trees will accumulate and continue expanding inside the insulation layer over the operation time, resulting in the increase of dielectric loss, the reduction of dielectric breakdown voltage, and even the thorough damage of cable insulation [ 3 ]. Water-tree aging is one of the primary factors leading to the dielectric deterioration of XLPE insulation, especially for medium voltage power cables.…”
Section: Introductionmentioning
confidence: 99%