Study on Improving Interface Performance of HVDC Composite Insulators by Plasma Etching

Xing, Yunqi; Wang, Yixuan; Chi, Jiakai; Liu, Hao-Liang; Li, Jin

doi:10.3390/coatings10111036

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…The chemical formula for the vulcanization process is depicted in Figure 2 [16]. RTV coating characteristics have been examined in a variety of studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, research data on RTV coating distribution effect on insulators have been scarcely reported.…”

Section: Room Temperature Vulcanizing (Rtv) Coating Characteristicsmentioning

confidence: 99%

“…The outcomes of the research revealed that RTV coatings offered long-term resistance against contamination flashover, even in extremely polluted environments. RTV coating characteristics have been examined in a variety of studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, research data on RTV coating distribution effect on insulators have been scarcely reported.…”

Section: Introductionmentioning

confidence: 99%

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Pollution Flashover Characteristics of Coated Insulators under Different Profiles of Coating Damage

et al. 2021

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Based on experiments and numerical analysis techniques, this paper aims to investigate the influence of the four different coating damage profiles on the performance of coated 33 kV porcelain insulator strings under polluted and clean surface conditions. The performance of the insulators coated with room temperature vulcanizing (RTV) under partial coating damage and undamaged coating was evaluated. The influence of humidity on pollution flashover was taken into consideration. The ring-shaped, fan-shaped, and random-shaped coating was applied following coating damage. The results showed that the flashover characteristic of the RTV-coated insulators had a significant difference as compared to the normal insulators. Electrical characteristics such as the flashover voltage, critical current, and surface resistance were significantly affected by coating damage distribution and humidity level on the insulators’ surface. The electric field and potential difference were analyzed as well using the finite element method (FEM). The initiation of the arc was observed to appear at the area of insulators where the electric field was the highest. It was also observed that different coating distributions of pollution and humidity levels resulted in a change in the surface pollution layer resistance and an uneven distribution of the electric field. This indicates that the coated insulators’ parameters are directly related to the coating damage distribution on the insulator surface, particularly in the presence of humidity.

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Section: Room Temperature Vulcanizing (Rtv) Coating Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pollution Flashover Characteristics of Coated Insulators under Different Profiles of Coating Damage

et al. 2021

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“…It exhibits high dielectric strength and insulation performance, effectively isolating the electric field between the insulator core rod and the external environment, thus avoiding electrical failures and improving the service life and reliability of the insulator. However, due to prolonged exposure to high electric field intensity, high temperatures, high humidity, high salt spray, and other complex external environments, aging is inevitable [9][10][11][12][13][14][15][16]. Some research has been conducted on the aging characteristics of silicone rubber materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the Ageing Characteristics of Silicone Rubber for Composite Insulators under Multi-Factor Coupling Effects

Li,

Zhang,

Chen

et al. 2023

Coatings

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Due to long-term exposure to high electrical field strength, heavy loads, and the complex climatic conditions in tropical coastal areas of China, widespread abnormal heating phenomena often occur in the operation of composite insulators in power transmission lines, posing a threat to the safe and stable operation of the power system. To study the ageing process of the silicone rubber sheath of composite insulators in the high-field, high-humidity, high-temperature, and high-salt-density environments along the coastal regions, this paper establishes a humidity–heat–electricity–salt spray accelerated ageing test platform and conducts ageing tests on silicone rubber materials for composite insulators under the coupled effect of multiple factors. The ageing characteristics of silicone rubber materials are analyzed using scanning electron microscopy, Fourier infrared spectroscopy, thermogravimetric analysis, and other methods. The results show that the coupled ageing factors have an impact on the surface morphology of silicone rubber. The continuous depolymerization of PDMS molecular chains leads to a decrease in the content of groups related to the hydrophobicity of the material, resulting in a deterioration of its hydrophobicity. Moreover, the degradation of silicone rubber materials and the enhanced moisture absorption capacity lead to an increase in the dielectric loss tangent of the saturated moisture-absorbing medium, thereby causing abnormal heating of the sheath at the end of the composite insulator. The research findings of this study are of significant reference value for revealing the degradation mechanism of composite insulator silicone rubber sheaths in tropical island environments and improving the service life of composite insulators.

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“…Nano dielectric coatings deposited by low-temperature plasmas have attracted more and more attention in recent years. However, most of these studies only focused on the gas-solid interface [23][24][25]. Liquid dielectrics, having high insulation strength, good dielectric recovery and heat dissipation property, are widely used in power equipment.…”

Section: Introductionmentioning

confidence: 99%

Nano-sized composite improving the insulating performance of insulating paper using low-temperature plasmas

Zhang

et al. 2021

Nanotechnology

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Nanostructured dielectric composite has been considered as a promising manner in improving the flashover performance of oil-paper which has been widely used in power systems. In this paper, plasma-enhanced chemical vapor deposition (PECVD) is used to deposit SiO2 on the ceramic fiber-reinforced insulating paper. Scanning electron microscope images show a large number of SiO2 nanoparticles with diameters of 100 nm–250 nm uniformly attached to the fiber surface after the plasma deposition. The surface flashover voltage of the insulating paper was tested in the air and the transformer oil, respectively. Results show that the corresponding DC surface flashover voltages increased by 15.1% in the air and breakdown between liquid and solid interface increased by 24.6% after the PECVD. It is believed that nanoparticles constructed in ceramic fibers change the electron injection barrier which inhibits the injection of negative charges and hinders the accumulation of charges in the dielectric. Nanoparticles can capture electric charges formed in the transformer oil which affects the generation and development of streamers, resulting in an increased dielectric strength. This study provides a new method to comprehensively improve the surface insulating property which has the prospect of promoting other dielectric materials.

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Study on Improving Interface Performance of HVDC Composite Insulators by Plasma Etching

Cited by 6 publications

References 17 publications

Pollution Flashover Characteristics of Coated Insulators under Different Profiles of Coating Damage

Pollution Flashover Characteristics of Coated Insulators under Different Profiles of Coating Damage

Study on the Ageing Characteristics of Silicone Rubber for Composite Insulators under Multi-Factor Coupling Effects

Nano-sized composite improving the insulating performance of insulating paper using low-temperature plasmas

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