Insulation Design of Superconducting Gas Insulated Transmission Line

Du, B. X.; Dong, Jianan; Wang, Mingyang; Ran, Z. Y.

doi:10.1007/978-981-15-9731-2_23

Cited by 9 publications

(17 citation statements)

References 19 publications

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“…For HVDC cables, the electric field distribution in the insulation layer is inversely proportional to the electrical conductivity, and the conductivity increases significantly with the increase of temperature. During the operation of HVDC cables, the higher temperature conductor core and the lower temperature sheath will cause the temperature gradient in the insulation, which can lead to the electric field inversion under the electric field-temperature gradient coupling field [1,7,8]. Therefore, it is urgent to reduce the temperature sensitivity of conductivity of XLPE in a wide temperature range.…”

Section: Conductance Currentmentioning

confidence: 99%

“…One is trapped charges, the carriers trapped by the charge traps in the insulation. The other is non-trapped charges, which are generated to ensure the continuity of the current flux in the insulation and form the new space electric field distribution to adapt to the insulation conductivity function of temperature and electric field [1][2][3]. The spatial accumulation of trapped charges will result in nonuniform distribution of electric field and decrease the withstanding voltage of insulation.…”

Section: Introductionmentioning

confidence: 99%

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Improved direct current electrical properties of XLPE modified by graftable antioxidant and crosslinking coagent at a wide temperature range

et al. 2023

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To enhance the DC electrical performance of cross‐linked polyethylene (XLPE), the graftable antioxidant methacrylic acid 2‐hydroxy‐3‐(4‐anilinoanilino) propyl ester (GA), which contains carbonyl and amino groups, and the crosslinking coagent trimethylolpropane trimethacrylate (TMPTMA), which contains carbonyl groups, are individually or co‐grafted onto XLPE. The slightly higher deep trap density introduced by higher grafting concentration of TMPTMA results in more significant suppression effect of conductance current and enhanced breakdown strength at a lower temperature, while the suppression effect for the conductance current at 90°C becomes weakened due to limited trap energy. Meanwhile, the deeper energy level introduced by GA suppresses the conductance current and improves the electrical strength of XLPE at 90°C more significantly. By co‐grafting, the conductance current of XLPE in a wide range temperature can be significantly reduced, especially for the temperature dependence of conductance current, which is beneficial to suppress the field strength reversal. The results of thermally stimulated current and molecular simulation show that the polar groups of two monomers introduce deep charge traps in XLPE. The co‐grafting system ensures the rationality of the crosslinking reaction kinetics and does not affect the cable manufacturing.

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Section: Conductance Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved direct current electrical properties of XLPE modified by graftable antioxidant and crosslinking coagent at a wide temperature range

et al. 2023

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“…The main fields of research in UHV transmission for the global electric grid interconnections are: UHV AC/DC substations and circuit design [146,147]; electromagnetically controlled environmental systems [148]; project management, construction and handling guidelines of tests on UHV equipments [149,150]; development of standard for testing of equipments; gas insulated transmission lines [151,152]; unmanned aerial and robot inspecting vehicles [153]; HVDC power grid protection and control [154][155][156]; performance and design evaluation of wireless, super-conductive and pipe power transmission technology [157][158][159][160][161].…”

Section: Development Of Uhv Transmission Systemsmentioning

confidence: 99%

Electric Power Network Interconnection: A Review on Current Status, Future Prospects and Research Direction

Imdadullah¹,

Alamri

et al. 2021

Electronics

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An interconnection of electric power networks enables decarbonization of the electricity system by harnessing and sharing large amounts of renewable energy. The highest potential renewable energy areas are often far from load centers, integrated through long-distance transmission interconnections. The transmission interconnection mitigates the variability of renewable energy sources by importing and exporting electricity between neighbouring regions. This paper presents an overview of regional and global energy consumption trends by use of fuel. A large power grid interconnection, including renewable energy and its integration into the utility grid, and globally existing large power grid interconnections are also presented. The technologies used for power grid interconnections include HVAC, HVDC (including LCC, VSC comprising of MMC-VSC, HVDC light), VFT, and newly proposed FASAL are discussed with their potential projects. Future trends of grid interconnection, including clean energy initiatives and developments, UHV AC and DC transmission systems, and smart grid developments, are presented in detail. A review of regional and global initiatives in the context of a sustainable future by implementing electric energy interconnections is presented. It presents the associated challenges and benefits of globally interconnected power grids and intercontinental interconnectors. Finally, in this paper, research directions in clean and sustainable energy, smart grid, UHV transmission systems that facilitate the global future grid interconnection goal are addressed.

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“…As one of the main converter devices, DCLCs perform voltage equalization, energy storage, and filtering [4]. Currently, DCLCs are extensively employed in smart grids, new energies, and rail transportation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

Sun,

Qiao,

et al. 2024

Energies

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Insulation resistance is a vital factor in dry DC link capacitors (DCLCs), and crucially influences their voltage equalization and energy storage performance. However, at present, there is a lack of experimental observation on the insulation resistance characteristics of DCLCs in the presence of high temperatures and operating voltages. In the present study, the insulation resistance and conductivity of DCLCs are methodically analyzed. For this purpose, the corresponding test platform is appropriately fabricated, the insulation resistance measurement experiments are performed at various temperatures and operating voltages, and the factors affecting the insulation resistance and conductivity of the DCLC are carefully examined. The results reveal that the insulation resistance of the DCLC reduces exponentially with the growth in voltage and operating temperature. When the operating voltage becomes greater than 4480 V or the operating temperature reaches higher than 70 °C, the decline in insulation resistance slows down. The conductivity of metalized polypropylene film in the DCLC increases exponentially with increasing voltage and temperature. By increasing the operating voltage from 1960 V to 5600 V and the temperature from 20 °C to 90 °C, the DCLC’s insulation resistance exhibits a descending trend from 891.30 MΩ to 2.14 MΩ, while its conductivity grows from 3.49 × 10−16 S/m to 1.47 × 10−13 S/m. The results reveal that the key factors affecting the insulation resistance of the DCLC are the polypropylene film and the metal evaporated from the metal layer. This research is anticipated to provide a valuable reference for the further development of science and technology pertinent to the insulation resistance of DCLCs.

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Insulation Design of Superconducting Gas Insulated Transmission Line

Cited by 9 publications

References 19 publications

Improved direct current electrical properties of XLPE modified by graftable antioxidant and crosslinking coagent at a wide temperature range

Improved direct current electrical properties of XLPE modified by graftable antioxidant and crosslinking coagent at a wide temperature range

Electric Power Network Interconnection: A Review on Current Status, Future Prospects and Research Direction

Insulation Resistance Characteristics of Dry DC Link Capacitors in the Presence of High Temperatures and Operating Voltages

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