Modeling of the Electric Field in High Voltage Direct Current Gas Insulated Transmission Lines

Jörgens, Christoph; Hensel, Hendrik; Clemens, Markus

doi:10.1109/icd53806.2022.9863597

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…The gap distance is L=50 cm and SF 6 @ 0.5 MPa is used as insulating gas. The equivalent current density calculated with (15) agrees with the analytical expression ( 15) and both tend towards the saturation value predicted by (17).…”

Section: A Radiation Induced Conductivitysupporting

confidence: 79%

“…The gas electric conductivity σ G to be adopted in ( 1) is usually kept constant with values between 10 −16 and 10 −20 S/m for SF 6 [13], with a possible temperature and pressure P dependence [17]…”

Section: Numerical Modeling Of Hvdc-gis Components a Electric Field M...mentioning

confidence: 99%

“…where u is the convective velocity field, C p [J/(kg•K)] the heat capacity, k [W/(m•K)] the thermal conductivity, ρ the density [kg/m 3 ] and Q [W/m 3 ] the heat source. For SF 6 gas the thermal conductivity generally depends on temperature, for example via a polynomial expression [17] k SF 6 (T ) = −9.51 • 10 −3 + 8.657…”

Section: B Coupled Electro-thermal Modelingmentioning

confidence: 99%

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Development of HVDC Gas-Insulated Components for the Power Supply of Neutral Beam Injectors

Lucchini

Marconato²

2023

IEEE Access

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The development of High Voltage Direct Current Gas-Insulated components that will be employed for the power supply of Neutral Beam Injectors, requires specific numerical tools to analyze the electric field distribution, with the purpose of supporting the engineering and operational phases.The tools must comply with the nonlinearity of the material properties of solid insulators and the transport mechanisms in the dielectric gas. Despite its high Global Warming Potential, SF6 will be considered as the baseline dielectric gas for the development of HVDC gas-insulated components to be used for the Acceleration Grid Power Supply of Neutral Beam Injectors. Attention especially to the mechanisms driving to an increase of leakage current flowing in the gas, thus giving rise to possible discharge phenomena is here placed, mainly focusing on radiation and injection regimes. The described methodologies are adopted for the numerical modeling of the 500 kV DC gas-insulated components that will be used for the power supply of the Neutral Beam Injector of the Divertor Tokamak Test facility. In particular, a conceptual design of the SF6 Transmission Line and the SF6-air bushing is conceived.INDEX TERMS Divertor tokamak test (DTT), neutral beam injector, HVDC, gas insulated transmission lines, high voltage bushing.

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Section: A Radiation Induced Conductivitysupporting

confidence: 79%

Section: Numerical Modeling Of Hvdc-gis Components a Electric Field M...mentioning

confidence: 99%

Section: B Coupled Electro-thermal Modelingmentioning

confidence: 99%

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Development of HVDC Gas-Insulated Components for the Power Supply of Neutral Beam Injectors

Lucchini

Marconato²

2023

IEEE Access

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“…These conditions are examined in this work, since under these conditions both 𝜀-FGM and 𝜎-FGM are required to control the electric field. The concept of FGM is to vary the permittivity and/or electric conductivity of the spacer material spatially [4,5,11,12,13,14,15,16]. The areas where the spacer is under high electric fields have a higher value of permittivity/electric conductivity to reduce the electric field stress, compared to spacer parts, where high electric fields do not occur.…”

Section: A Concept Of 𝜎/𝜀-Fgmmentioning

confidence: 99%

“…Functionally graded materials (FGM) are used as a technique to control the electric field stress. A spatial distribution of the electric conductivity (DC) or permittivity (AC) in the spacer (𝜎-FGM/𝜀-FGM) have been proposed in previous works to reduce the electric field stress within the GIL [4,5,11,12,13,14,15,16]. The electric conductivity is decisive for the electric field under DC steady state condition.…”

Section: Introductionmentioning

confidence: 99%

GPU-Accelerated Field Simulation of HVAC Gas Insulated Lines

Hensel

Henkel

Haußmann

et al. 2022

2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation (CEFC)

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Functionally graded materials (FGM) are applied in HVDC gas insulated lines (GIL) to control the electric field within the DC insulation system. In HVDC GIL, FGM with a spatial distribution of the electric conductivity (𝝈-FGM) is applied to control the electric field under DC steady state condition. However, besides DC steady state, different DC conditions occur, e.g. DC-on process, polarity reversal and lightning impulse. Under these conditions 𝝈-FGM is not sufficient to control the electric field, since these conditions result in transient capacitive fields, where the permittivity is decisive for the electric field. In this paper, we suggest combining 𝝈-FGM and a spatial distribution of permittivity (𝜺-FGM) in the spacer material to control the electric field around DC-GIL spacer for various DC-conditions, considering nonlinear material models for the insulating gas and the epoxy spacer. A variation of the spatial distribution of permittivity and conductivity in the spacer is investigated in this paper for an effective field reduction. The results show a reduction of the electric field intensity up to 65.8 %, when 𝝈/𝜺-FGM is applied.

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Effect of Different Grounding Schemes on the Circulating Current of Gas-Insulated Transmission Lines

Tian,

Gong,

Xiang

et al. 2023

Lecture Notes in Electrical Engineering

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Modeling of the Electric Field in High Voltage Direct Current Gas Insulated Transmission Lines

Cited by 3 publications

References 9 publications

Development of HVDC Gas-Insulated Components for the Power Supply of Neutral Beam Injectors

Development of HVDC Gas-Insulated Components for the Power Supply of Neutral Beam Injectors

GPU-Accelerated Field Simulation of HVAC Gas Insulated Lines

Effect of Different Grounding Schemes on the Circulating Current of Gas-Insulated Transmission Lines

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