Influence of Conducting Particle on DC Flashover Characteristics and Tracking Property of GIS/GIL Insulator

Li, Xiaolong; Cao, Chen; Lin, Xin

doi:10.1109/access.2022.3150482

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…• The ''firefly'' phenomenon. Metal particles attached to solid insulator may reduce the flashover voltage triggering to breakdown [33]. The ''firefly'' is a cyclic mechanism characteristic of HVDC gas-insulated systems operating in negative polarity; for example, this is the case of the AGPS gas-insulated components for N-NBIs.…”

Section: Metal Particlesmentioning

confidence: 99%

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: Metal Particlesmentioning

confidence: 99%

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

Lucchini

Marconato²

2023

IEEE Access

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“…The synergistic effect concerns the phenomenon that the dielectric strength of the gas mixture shows superiority to the weighted average of each constituent and behaves in a non-linear relation [5,12]. The synergistic effect could be evaluated with Equation (2),…”

Section: Synergistic Effectmentioning

confidence: 99%

“…SF 6 is widely applied in gas-insulated switchgear (GIS) due to its excellent insulation and arc-quenching properties [1,2]. However, SF 6 was classified as a limited gas in the Kyoto Protocol due to the serious greenhouse effect and durable activity in the atmosphere attributed to its chemical stability [3].…”

Section: Introductionmentioning

confidence: 99%

Surface Flashover Characteristics of Epoxy Resin Composites in SF6/CF4 Gas Mixture with DC Voltage

Wang

Chen

et al. 2022

Energies

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SF6/CF4 mixture is considered a potential substitution for SF6 in gas-insulated equipment owing to the considerable insulation and low temperature characteristics of CF4. This paper concerns the substitutability of the mixture on the surface flashover property. Epoxy resin composites for solid insulators are applied since flashover at the insulator interface often occurs and results in severe damage to the safe operation of the equipment. Two kinds of electrode systems are designed to study DC flashover properties with different electric field uniformities. The obtained result shows that the flashover voltage in the 20% SF6/80% CF4 mixture achieved more than 70% of the voltage in SF6 at the same pressure. The mixture shows considerable synergy in the surface flashover process and performed different tendencies with varying gas pressures and contents under different electrode systems due to the influence of surface accumulated charge. Moreover, it is considered that surface charge due to ionization may result in a reversal phenomenon for voltage polarity with increasing pressure. The results indicate the possibility of SF6/CF4 functioning as an efficient substitution of SF6 with a considerable insulation property and improved environmental protection characteristics.

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“…When metal particles are subjected to multiple forces within the GIL, the phenomenon of free motion may occur. The moving particles may even attach to the electrodes or insulators to trigger partial discharge phenomena, which can seriously damage the insulation performance of the GIL and affect the safe and stable operation of the system [5], [6], [7]. Therefore, it is important to be familiar with the movement The associate editor coordinating the review of this manuscript and approving it for publication was Rajesh Kumar.…”

Section: Introductionmentioning

confidence: 99%

Study on the Capture Effect of Particle Trap in 1000 kV AC GIL

et al. 2023

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In this paper, a 1000 kV gas insulated transmission line (GIL) prototype with a basin insulator and a three-post insulator structure was designed and developed to study the particle motion behavior in an ultra high voltage (UHV) GIL. Particle traps were arranged on the convex side of the basin insulator and near the three-post insulator. Aluminum and copper particles were arranged in front of and on the surface of the traps. A short-time voltage application procedure and a graded long-time voltage application procedure were designed to investigate the difference in the capture effect of the traps on the two types of particles when the test voltage was applied to the prototype through these two voltage application procedures. The results of the study show that the particle motion behavior is complex under AC voltage. The placement of the particles, their own properties and the voltage application procedure all affect the motion behavior of the particles. The trap with the grid structure is effective in capturing particles near both the convex side of the basin insulator and the three-post insulator. At the end of the test, some of the particles went inside the trap and some of them gathered at the edge of the trap. The graded long-time voltage application procedure with a small voltage application gradient and a long duration enables the particles to move sufficiently at a lower voltage to be trapped.INDEX TERMS Particle trap, particle motion, trap capture, UHV GIL.

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Influence of Conducting Particle on DC Flashover Characteristics and Tracking Property of GIS/GIL Insulator

Abstract: Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

Cited by 7 publications

References 26 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

Surface Flashover Characteristics of Epoxy Resin Composites in SF6/CF4 Gas Mixture with DC Voltage

Study on the Capture Effect of Particle Trap in 1000 kV AC GIL

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