Surface Charge Accumulation on a Real Size Epoxy Insulator With Bouncing Metal Particle Under DC Voltage

Gao, Yu; Wang, Huan; Yuan, Xiaochen; Zhao, Huicun; Li, Ziyi

doi:10.1109/tps.2021.3089504

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…Affected by the electric field, metal particles will carry charges and distort the electric field, which aggravates gas side discharge and causes surface charge accumulation. The size, shape, and location of metal particles have an important influence on the formation and distribution of surface charge [48][49][50][51][52].…”

Section: The Influence Of Metal Particlesmentioning

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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Section: The Influence Of Metal Particlesmentioning

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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“…Surface charge is considered to accumulate under the stress of the electric field owing to the field emission caused by points on the electrode surface, partial discharge due to the air gap between the solid dielectric and electrode, interlayer polarization considering the difference between dielectrics, discontinuity or non-linearity on the conductivity of the EP sample, etc. [15][16][17]. Moreover, the accumulation of surface charge would be a serious issue under the HVDC electric field.…”

Section: Synergistic Effectmentioning

confidence: 99%

“…With the development of high-voltage direct-current (HVDC) transmission, surface flashover would cause a severe challenge to the insulator in GIS owing to the accumulation of surface charge under the stress of the DC field [15][16][17]. However, research concerned with DC flashover has mostly focused on SF 6 [18], and little attention has been paid to the gas mixture or new environmental gas.…”

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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“…The charges are accumulated on the insulator surface under the application of the electric field. Gao, Y. et al have studied the influence of bouncing linear metal particles on the charge accumulation of an epoxy insulator under DC voltage [7]. It has been pointed out that there are two main motion modes of the bouncing particle and the impact of a charged particle hitting the edge of the electrode on the charge accumulation is more significant than other modes.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating

2022

Self Cite

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Epoxy insulators are widely used in Gas-Insulated Transmission Lines (GILs), playing a significant role in electrical insulation and mechanical support. The metal particles generated during the production and operation of the equipment aggravate surface charge accumulation on the insulator, causing surface flashover. Therefore, it is necessary to study the suppression strategy of charge accumulation. In this paper, a downsized disc insulator was taken as the research object to investigate the effect of zoning coating on charge suppression with the presence of a linear aluminum metal particle under negative DC voltage. The zoning coating method was achieved by painting coatings with different conductivities in three areas on the insulator surface to regulate the charge. The inhibition mechanism of zoning coating on the charge accumulation in the presence of a linear metal particle was analyzed with the assistance of numerical simulation. The results showed that negative charges were accumulated in the nonplanar region as there was no metal particle, and the existence of metal particles led to the significant accumulation of positive charge speckles in the nonplanar region. The application of zoning coating could significantly inhibit the charge accumulation in the nonplanar area of the insulator and the charge injection from the grounded electrode to reduce the charge density. Under −25 kV, the maximum charge density on the insulator with the zoning coating was 48.1% lower than that without the coating, and the inhibition effect increased by 57.9% when the metal particle was introduced. This paper provides a new way to suppress the charge accumulation on the insulator surface.

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Surface Charge Accumulation on a Real Size Epoxy Insulator With Bouncing Metal Particle Under DC Voltage

Cited by 15 publications

References 13 publications

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

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

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

The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating

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