Novel EPR-insulated DC cables for future multi-terminal MVDC integration

Tefferi, Mattewos; Li, Zongze; Cao, Yang; Uehara, Hiroaki; Chen, Qin

doi:10.1109/mei.2019.8804331

Cited by 20 publications

(14 citation statements)

References 16 publications

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“…To generate the thermal gradient across the thickness of the flat samples for simulating the "loaded" cable, an emulated thermal gradient was generated using thin-film heaters with resistance temperature detectors (RTD) applied to the top and bottom surface of the PEA test cell and close to the samples as feedback controls. This was achieved with a heating power of 20W and with the whole system placed into an oven at 50 o C. Details of the experimental setup have been presented in our previous publication [21][22][23].…”

Section: Space Chargementioning

confidence: 99%

The Correlation and Balance of Material Properties for DC Cable Insulation at Design Field

et al. 2020

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The innovation of materials with disruptive properties can be efficiently guided by improved physical understanding of material design principles. The design of a polymeric insulation depends on the desired requirements of the specific application, which, in the case of DC cable insulation, can be stated in terms of the following properties: controlled electrical conductivity, low space charge accumulation and high breakdown strength. Full characterization and detailed understanding of these properties as well as their correlation and balance may bring the ability to engineer needed dielectric properties for using as DC cable insulation. The aim of this paper is to identify the optimal DC insulation design space and to develop a formalism of the correlation between the conductivity and space charge, guided by a relatively simple model based on two physical parameters, activation energy (ξ) and mean trap separation (λ). With respect to implications for practical material design, the study demonstrates that a polymer material with activation energies in the range of 0.4 to 0.5 eV with relatively high trap density (N) (N= λ-3 , λ=1nm, N=1E+27 m-3) can be suitable for HVDC cable insulation. INDEX TERMS conductivity, material design, direct current (DC), crosslinked polyethylene (XLPE), space charge, cable insulation, thermal gradient.

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Section: Space Chargementioning

confidence: 99%

The Correlation and Balance of Material Properties for DC Cable Insulation at Design Field

et al. 2020

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“…HIGH-voltage direct current (HVDC) expands rapidly as an efficient non-synchronized solution for bulk grid interconnections with benefits of reduced power loss, no reactive power and enhanced stability. Free from reactive power loss, HVDC cabling becomes viable solutions for submarine power transmission, urban grid decongestion, offshore wind power integration, and harsh environment electrifications [1,2]. However, high electric field and thermal gradient arising from the high voltage and large current density exert stringent stresses to the cable insulation as the resultant electric field distortion and non-uniform conductivity could give rise to the formation of space charges [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Free from reactive power loss, HVDC cabling becomes viable solutions for submarine power transmission, urban grid decongestion, offshore wind power integration, and harsh environment electrifications [1,2]. However, high electric field and thermal gradient arising from the high voltage and large current density exert stringent stresses to the cable insulation as the resultant electric field distortion and non-uniform conductivity could give rise to the formation of space charges [2][3][4]. Accumulated space charges could further enhance local electric fields, increase the risk of degradation and even lead to breakdown of insulating materials [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it has been reported that polymers with 2D platelet inorganic fillers or coatings exhibit unique electrical performance, e.g., suppressed conduction, improved breakdown strength and accelerated charge dissipation, etc. [13][14][15], while study of their impacts on DC cable characteristics has not been conducted [2]. Compared to synthetic metallic oxide or nonmetallic inorganic oxide fillers reported in most of the aforementioned investigations, mineral inorganic fillers have advantages of low cost and high scalability for industrial manufacturing.…”

Section: Introductionmentioning

confidence: 99%

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Charge Transport Dynamics and Space Charge Accumulation in XLPE Composites with 2D Platelet Fillers for HVDC Cable Insulation

Arab

Ronzello

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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Here, based on the dielectric response analysis, we report the charge transport dynamics as related to space charge accumulation for three model XLPE composites with 2D platelet silicate fillers. Dynamics of charge transport and the interplay between polarization and space charge are revealed by the equivalent circuit analysis with the Dissado-Hill dielectric response model. In addition to the quasi-DC process, a characteristic dielectric loss peak in the frequency range of 0.1 Hz to the power frequency is observed and attributed to the relaxation of charges trapped by fillerpolymer interfaces. It is demonstrated that the physical nature of trapping and transport revealed by parameters extracted from the quasi-DC process and dielectric loss peak can be well correlated to the characteristics of space charge accumulations in the model XLPE composites containing distinctively different 2D platelet fillers.

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“…The activities in this area are mainly directed towards improving purity [9,10], adding organic additives/voltage stabilizers [11,12] and nanofillers [13][14][15][16]. Other materials such as polyethylene-based nanocomposites [5,17,18], polypropylene (PP) [19][20][21][22], ethylene-propylene rubber (EPR) [23,24] and polymer blends [25][26][27] have also received attention as potential substitutes for XLPE. Even though these materials have been found to exhibit some desired properties, e.g., ultralow conductivities [28], in-depth electrical characterization is essential before commercial HVDC applications [1,2] can be considered.…”

Section: Introductionmentioning

confidence: 99%

Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Kumara

Hammarström

et al. 2020

Energies

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To design reliable high voltage cables, clean materials with superior insulating properties capable of operating at high electric field levels at elevated temperatures are required. This study aims at the electrical characterization of a byproduct-free crosslinked copolymer blend, which is seen as a promising alternative to conventional peroxide crosslinked polyethylene currently used for high voltage direct current cable insulation. The characterization entails direct current (DC) conductivity, dielectric response and surface potential decay measurements at different temperatures and electric field levels. In order to quantify the insulating performance of the new material, the electrical properties of the copolymer blend are compared with those of two reference materials; i.e., low-density polyethylene (LDPE) and peroxide crosslinked polyethylene (XLPE). It is found that, for electric fields of 10–50 kV/mm and temperatures varying from 30 °C to 70 °C, the DC conductivity of the copolymer blend is in the range of 10−17–10−13 S/m, which is close to the conductivity of crosslinked polyethylene. Furthermore, the loss tangent of the copolymer blend is about three to four times lower than that of crosslinked polyethylene and its magnitude is on the level of 0.01 at 50 °C and 0.12 at 70 °C (measured at 0.1 mHz and 6.66 kV/mm). The apparent conductivity and trap density distributions deduced from surface potential decay measurements also confirmed that the new material has electrical properties at least as good as currently used insulation materials based on XLPE (not byproduct-free). Thus, the proposed byproduct-free crosslinked copolymer blend has a high potential as a prospective insulation medium for extruded high voltage DC cables.

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Novel EPR-insulated DC cables for future multi-terminal MVDC integration

Cited by 20 publications

References 16 publications

The Correlation and Balance of Material Properties for DC Cable Insulation at Design Field

The Correlation and Balance of Material Properties for DC Cable Insulation at Design Field

Charge Transport Dynamics and Space Charge Accumulation in XLPE Composites with 2D Platelet Fillers for HVDC Cable Insulation

Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

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