Assessment of dielectric properties of cable insulation

Durman, Vladimir; Vary, Michal; Packa, Juraj; Lelak, Jaroslav; Šály, V.

doi:10.1109/epe.2017.7967226

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Müxtәlif şәraitlәrdә deqradasiya vә inkişaf mexanizmi daxil olmaqla, kabel izolyasiyasının köhnәlmәsinin qiymәtlәndirilmәsi üzrә tәdqiqatlar 1960-cı illәrdә başlamış vә o vaxtdan bәri bir çox effektiv texnologiyalar hazırlanmışdır [3,4]. Belә tәdqiqatların mәqsәdi kabel izolyasiyasının deqradasiya dәrәcәsini müәyyәn etmәk vә köhnә kabellәrin lazımi vaxtda dәyişdirilmәsini tәmin etmәkdir [5].…”

Section: Introductionunclassified

İsti̇smardaki Kabellәrdә Zәdәlәri̇n Aradan Qaldirilmasinin Müasi̇r Üsullari

Avaz Camalov

2024

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XLPE insulated power cables serve as essential components in medium and high voltage power transmission lines, yet maximizing their resource duration poses a significant challenge for consumers. Issues such as water treeings, electric treeings, and partial discharges within the insulation system accelerate cable aging over time. In response, a novel approach has been proposed in this study to mitigate these detrimental factors. The method involves injecting a specially formulated liquid into the cable insulation to address inhomogeneities, effectively rejuvenating the cable and extending its service life by 20-30 years, as indicated by the technology's name. Furthermore, to provide context on the practical implications, a succinct analysis of the Azerbaijani cable network is presented in this article. Also, in order to explain the real situation of power cables, a brief analysis of the Azerbaijani cable network was conducted in the article.

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Section: Introductionunclassified

İsti̇smardaki Kabellәrdә Zәdәlәri̇n Aradan Qaldirilmasinin Müasi̇r Üsullari

Avaz Camalov

2024

EƏ

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“…process of degradation under different conditions began in the 1960s, and many effective technologies have since been developed [2], [3]. The goal of such research is to identify the degradation degree of cable insulation and consider the replacement of old cables at the right time [4]. Due to the complexity of the on-site environment and the multiple sources of interference, currently available cable insulation aging assessment applications have insufficient accuracy [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Cable Rejuvenation by Simulating Cable Operation

et al. 2020

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Further research on retired cable rejuvenation via heat treatment was investigated in this paper. Three retired cables with service year of 7, 15 and 30 years were used and annealed at different temperatures following two different heat treatment methods. In the first test, two short cables with a length of 5 m were prepared and cut into five equal segments. Four segments of each cable were annealed at 90, 95, 100, and 105 • C to simulate the cable operation. Then, the cross-linked polyethylene (XLPE) from the cable insulation was peeled, and the peels from the inner, middle and outer positions were selected and subjected to the differential scanning calorimetry (DSC), DC conduction current, and dielectric breakdown strength measurements. The thermal and electrical performance of these samples were analyzed, and the optimum annealing temperature was determined. In the second test, three identical long cables were connected to a transformer, joints, and terminals to build two experimental circuits. The cables were annealed at the optimum temperature determined in the first test. The same measurements were performed on XLPE samples taken from the same positions as those in the first test. The results showed that the short cables exhibited the best thermal and electrical performance when annealed at 95 • C. The three long cables annealed at 95 • C verified that the thermal and electrical properties of the cable insulation were significantly improved. The results of the two different annealing methods, which closely represent the actual cable operations, verified the feasibility that old cables without overheating history could be rejuvenated via heat treatment. INDEX TERMS Cable, DSC, melting point, crystallinity, electrical conductivity, dielectric breakdown strength.

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