Development Of 275 kV XLPE Cable System And Prospect Of 500 kV XLPE Cable

Takaoka, M.; Ono, M.; Kaji, Ikuo

doi:10.1109/tpas.1983.318146

Cited by 9 publications

(2 citation statements)

References 1 publication

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“…At present, submarine power cables are primarily fabricated by using crosslinked polyethylene (XLPE) materials to realize electrical insulation in high voltage grade [1,2]. However, the traditional crosslinking technology using peroxide in the production of high voltage cables has shown a variety of 2 of 14 inevitable limitations in the heating processes of chemical reactions, such as high energy consumption, low heat transfer efficiency, and short-time continuous reaction.…”

Section: Introductionmentioning

confidence: 99%

UV-Initiated Crosslinking Reaction Mechanism and Electrical Breakdown Performance of Crosslinked Polyethylene

Sun

Wang

2020

Polymers

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The ultraviolet (UV) irradiation crosslinking reactions of polyethylene and the electronic properties of photo-initiators and reaction products are theoretically investigated by the first-principles calculations. The crosslinked polyethylene (XLPE) materials are prepared in experiments that employ the UV-initiated crosslinking technique with different photon-initiation systems. Infrared spectrum and the alternating current dielectric breakdown strength of UV-initiated XLPE are tested to explore the effect of reaction products on the breakdown characteristics in combination with the electron structure calculations. The theoretical calculations indicate that the 4-hydroxybenzophenone laurate, which is compatible with polyethylene, can effectively initiate crosslinking reactions of polyethylene molecules under UV photon excitation and will produce reaction by-products from carbonyl radicals; as a macromolecular auxiliary crosslinker, the monomer or homopolymer of dioleyl-2,2′,4,4′-tetraallyl isocyanurate can form chemical connections with multiple polyethylene molecules acting as a crosslinking node in a photon-initiated reaction process. The carbonyl, hydroxyl, or ester groups of reaction by-products are capable of capturing hot electrons to prevent polyethylene molecules from impact ionization, and thus will increase the breakdown electric field. The macromolecular auxiliary crosslinker and the macromolecular photon initiator as well as its reaction by-product can convert the energy of their captured high-energy electrons into heat, which can act as a voltage stabilizer. The molecule characterization of infrared spectra demonstrates that the characteristic absorption peaks of the carbonyl in the macromolecular photon initiator and the allyl in the macromolecular auxiliary crosslinking agent are gradually decreasing in intensity as the crosslinking reaction proceeds, which is consistent with the conclusion from theoretical calculations. Compared with the small molecular photon-initiation system generally used in the photon-initiated crosslinking process, the higher dielectric breakdown field of XLPE being prepared by utilizing a macromolecular photon-initiation system is in good agreement with the calculation results of electronic affinity and ionization potential. The consistent results of the experiments and first-principles calculations elucidate the fundamental mechanism of the UV-initiation crosslinking technique and suggest a prospective routine to improve the insulation strength for developing high-voltage XLPE insulating materials.

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Section: Introductionmentioning

confidence: 99%

UV-Initiated Crosslinking Reaction Mechanism and Electrical Breakdown Performance of Crosslinked Polyethylene

Sun

Wang

2020

Polymers

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“…Insulation of the removed cable was manufactured by dry curing method [2]. The insulation thickness was 27mm, which was worked out by dividing the requirements of the withstand voltages derived from the following equations by the minimum statistical insulation breakdown voltages (location parameters of the Weibull distribution) obtained from the breakdown data of XLPE cables manufactured by dry curing process, that is, lightning impulse voltage of 60kV/mm and AC voltage of 30kV/ mm [21. these values sufficiently exceeded the minimum statistical insulation breakdown stress, that is, 30kV / mm in AC and 60kV / mm in impulse.…”

Section: Descridtions Of Removed Cable and The Cable Routementioning

confidence: 99%

Investigation on characteristics of 275 kV XLPE cable removed from actual service line

Kaneko

Ohno

Toya

et al.

Proceedings of 1994 IEEE International Symposium on Electrical Insulation

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Construction o f the Removed Cable XLPE cables have been increasingly employed for the actual lines, replacing oil-filled cables. In the extra high voltage field, more than ten years have passed since the first installed 275kV XLPE cable in Japan. Recently, technical requirements for a diagnostic method t o actual service lines have been increasing. A lot of available informations on the method were expected to be gathered by the investigation about actually used 275kV XLPE cables. The Tokyo Electric Power Co., Inc. and Fujikura Ltd. conducted various electrical tests and physical tests on the first 275kV XLPE cable by removing from the actual service line t o check its insulation performance and the state of deterioration in physical properties of the cable materials. The cable investigated was manufactured by dry curing method and constructed with a corrugated aluminium sheath, which means no water will penetrate into cable. No serious deterioration was observed for the removed 275kV XLPE cable.

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Multiple stress aging of solid-dielectric extruded dry-cured insulation systems for power transmission cables

Densley¹,

Bartnikas

Bernstein

1994

IEEE Trans. Power Delivery

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Development Of 275 kV XLPE Cable System And Prospect Of 500 kV XLPE Cable

Cited by 9 publications

References 1 publication

UV-Initiated Crosslinking Reaction Mechanism and Electrical Breakdown Performance of Crosslinked Polyethylene

UV-Initiated Crosslinking Reaction Mechanism and Electrical Breakdown Performance of Crosslinked Polyethylene

Investigation on characteristics of 275 kV XLPE cable removed from actual service line

Multiple stress aging of solid-dielectric extruded dry-cured insulation systems for power transmission cables

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