Contribution of surface charges on high‐voltage DC silicon rubber insulators to DC flashover performance

Mahmoodi, Jamshid; Akmal, A. Shayegani

doi:10.1049/iet-gtd.2018.6417

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Besides, it can be speculated that the improvement of flashover voltage was also connected to the change of di electric constant. According to the above dielectric test results, fluorination can depress the dielectric constant, which means it can reduce the overall distortion of electric field along the insulation surface, thus improve the flashover resistance of insulating materials [33][34][35][36][37].…”

Section: Flashover and Charge Dissipation Propertiesmentioning

confidence: 97%

Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Lü

Ruan

Song

et al. 2019

J. Phys. D: Appl. Phys.

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is a kind of insulating ceramics with high rigidity and melting point, which has been widely used in the preparation of basin-type insulators [1]. Meanwhile, Al 2 O 3 is one of the most commonly used fillers for composites [2]. Filling nano-Al 2 O 3 can improve the mechanical strength [3-6], thermal stability [7,8], wear resistance [9, 10] and other properties of composite materials, but the improvement of surface insulation performance is not obvious [11,12].

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Section: Flashover and Charge Dissipation Propertiesmentioning

confidence: 97%

Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Lü

Ruan

Song

et al. 2019

J. Phys. D: Appl. Phys.

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“…As a result, the accumulated surface charge cannot dissipate for a long time. Therefore, the operation of the GIL is threatened due to the flashover triggered by the accumulated surface charges [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Review of Surface Charge Accumulation on Insulators in DC Gas-Insulated Power Transmission Lines: Measurement and Suppression Measures

Liang,

Luo,

Fan

et al. 2023

Energies

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Gas-insulated power transmission lines (GILs) can replace cables and overhead transmission lines, playing an important role in DC transmission systems. However, the influence of surface charge accumulation on insulation reliability cannot be ignored as the operational voltage of the DC GIL increases. In this paper, the measurement methods for the insulator surface potential are summarized, including, dust maps, the Pockels effect method, and the electrostatic probe method. Then, a typical surface charge inversion algorithm is introduced. The main influencing factors of surface charge accumulation are analyzed, such as the applied voltage, insulation gas, insulator shape, and temperature. The charge accumulation pathway is revealed. Furthermore, methods for inhibiting the accumulation of surface charges and promoting the dissipation of accumulated charges are introduced to reduce the surface charges on insulators. Finally, the development direction of DC GIL insulators is predicted. We anticipate that the online monitoring of surface charge distribution, clarifying the percentage of charge accumulation pathways, and optimizing the insulator casting process will be the research directions for the insulator surface charge topic in the future. This article provides a comprehensive understanding of the surface charges of GIL insulators and a reference for the insulation design of DC GILs.

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“…The electric field distribution is the basic factor driving the initiation of discharge, and the surface charges often induce the occurrence of the abnormal flashover directly [8][9][10][11][12][13]. The other factors, such as metal particles, material properties, and surface states, could influence the flashover indirectly by promoting or hindering the distortion of electric field distortion and the surface charge accumulation [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

Wu¹,

Xu²,

Zhang³

et al. 2022

Phys. Scr.

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Under DC voltage, the interface charge of the spacer in gas-insulated metal-enclosed transmission lines (GIL) and gas-insulated metal-enclosed switchgear (GIS) is prone to accumulate, and the charge is an important factor to induce surface flashover. This paper concentrates on the surface flashover induced by solid-gas interface charge accumulation in DC GIL/GIS. Firstly, the electric field distribution of the real insulator and the electrode structure commonly used in research are analyzed and summarized into two distribution forms: the tangential-component dominant type and the hybrid type. According to the electric field distribution forms, how the density distribution and electric field distortion of interface charge influence the flashover voltage of spacer is reviewed, and the influence of metal particles on charge and surface flashover is reviewed as well. Finally, the existing physical models of surface flashover induced by interface charge are summarized.

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Contribution of surface charges on high‐voltage DC silicon rubber insulators to DC flashover performance

Cited by 11 publications

References 20 publications

Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Review of Surface Charge Accumulation on Insulators in DC Gas-Insulated Power Transmission Lines: Measurement and Suppression Measures

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

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Contribution of surface charges on high‐voltage DC silicon rubber insulators to DC flashover performance

Cited by 11 publications

References 20 publications

Enhanced surface insulation and depressed dielectric constant for Al2O3/epoxy composites through plasma fluorination of filler

Enhanced surface insulation and depressed dielectric constant for Al2O3/epoxy composites through plasma fluorination of filler

Review of Surface Charge Accumulation on Insulators in DC Gas-Insulated Power Transmission Lines: Measurement and Suppression Measures

Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation

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Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler