Comparative Laboratory Evaluation of TR-XLPE and XLPE Cables With Super-Smooth Conductor Shields

Katz, C.; Walker, Miles; Fryszczyn, B.

doi:10.1109/tpwrd.2004.835789

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Thermosetting insulating materials are widely used in electrical power equipment due to the excellent electrical, thermal, and mechanical properties. The EP used in supporting insulators and bushings [41], the XLPE used in high-voltage cables [42], and the SR used in outdoor composite insulation [43] are all thermosetting materials. Conventionally, high temperature environment is utilized to activate the cross-linking reaction during the processing thermosetting insulating materials.…”

Section: Light-curing Instead Of Heat-curing 221 Photocurable Process...mentioning

confidence: 99%

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Zhang

Zhao

et al. 2023

J. Phys. D: Appl. Phys.

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Polymeric insulating materials is the basis of electric power system and has been widely employed in various electric power system apparatus. With the emergence of net-zero carbon emission policies by 2050-2060, the eco-friendly polymeric insulation is urgent and promising in the R&D of advanced dielectric materials. This paper reviews the current progress of eco-friendly upgrade in each lifecycle stages of polymeric insulating materials, i.e. raw material, fabricating, operating, and retiring. A series of interesting and fundamental results have been summarized. Drawbacks of the current researches are discussed, and outlooks are provided for the future development of eco-friendly polymeric insulating materials. This paper is hoped to inspire some novel ideas for the development of advanced insulating materials suitable for the promotion of net-zero carbon emission technologies.

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Section: Light-curing Instead Of Heat-curing 221 Photocurable Process...mentioning

confidence: 99%

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Zhang

Zhao

et al. 2023

J. Phys. D: Appl. Phys.

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“…Additionally, it is widely accepted that impulse voltages are one of the most accelerating ageing factors of the XLPE, mainly acting on the growing of the treeing phenomenon starting from inclusions, voids, semi-conductive layer protuberances or at the interfaces between materials [4,5,6]. In general, it is accepted that if the polymer is aged the local concentration of space charge is enhanced and this produces the local modifications on the structure of the polymer towards critical levels in which voids, with sufficient size to develop partial discharges, and electric trees are created [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Space Charge Profile of TR-XLPE Cables Aged Under Multiple Stresses

Ramírez

Sanz

Silva

et al. 2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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In this paper the space charge distribution profile along the thickness of tree-retardant crosslinked polyethylene (TR-XLPE) cables, commonly used in medium voltage system and degraded under multiple factors as temperature, AC and impulse voltages are presented. A comparison of the space charge distribution along the insulation thickness (radial direction) of samples extracted from 15 kV TR-XLPE cables, 2 AWG Cu conductor, manufactured under dry curing process was done. Two 7m long cable samples were submitted to accelerated ageing; one sample was under thermal stress and the other was under electrothermal factors combining thermal cycles with 25 kV AC voltage applied continuously and impulse voltage transients. Looking at the results it can be concluded that after the first thermal cycle the space charge is reduced in comparison with the profile of the new sample. This confirms that crosslink by-products are expelled under thermal treatments. The space charge density is higher in the central region of the insulator thickness of the new sample and aged samples as well. It is also evident that the electrothermal ageing cycle is more severe because it releases more quantity of space charge along the insulation thickness than the thermal one.

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“…When the cable reaches the temperature associated to the thermal gradient under which the cable is degraded, the polymeric material may be partially molten and self-nucleation, crystallisation and annealing processes may take place [2,3,4]. On the other hand electrical stress associated to voltage impulse contribute extensively to the deterioration of XLPE, fundamentally in regards to the development of the treeing phenomenon from inclusions or protuberances of the material [5,6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the accelerated aging under different thermal cycles and voltages impulses in XLPE cables

Ramírez

Silva

Sanz³

et al.

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

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This article summarizes the changes on the main electrical, physical and thermal properties of the crosslinked polyethylene (XLPE) employed as insulation of medium and high voltage cables, operating under multiple degradation factors, such as temperature, AC voltage and voltage impulses. A comparison of changes on the properties of different cables samples, 2 AWG copper conductor, 15 kV XLPE insulation, was made. Those samples were put under accelerated aging process, applying two types of thermal cycles; one denominated "On-Off' and the other denominated "Daily Load Cycle". Both cycles were combined simultaneously with 23 kV AC permanently, followed by the electrical stress associated to voltage impulse test at the end of each cycle. Two impulse wave forms were employed, the standard lightning impulse (1.2/50 ps) and one non-standard voltage waveform impulse (30/1 10 ,us).

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Comparative Laboratory Evaluation of TR-XLPE and XLPE Cables With Super-Smooth Conductor Shields

Cited by 7 publications

References 5 publications

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Space Charge Profile of TR-XLPE Cables Aged Under Multiple Stresses

Comparison of the accelerated aging under different thermal cycles and voltages impulses in XLPE cables

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