Pollution morphology characteristics on a superhydrophobic surface and its pollution flashover voltage in DC electric field

Liu, Yi-Jie; Guo, Yujun; Wang, Bo; Zhang, Xueqin; Huang, Guizao; Zhang, Guangquan; Liu, Yicen; Qin, Deng; Wu, Guangning

doi:10.1049/hve2.12165

Cited by 17 publications

(9 citation statements)

References 32 publications

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“…Collision ionisation in gas phase Plasma expansion Computable (4). Surface states (Surface morphology [79][80][81][82], roughness [83][84][85][86][87], charging [88][89][90][91][92], surface gas [17,24,93,94] etc. ); (5).…”

Section: Gas-solid Interactionmentioning

confidence: 99%

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Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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Surface flashover is a devastating electronic avalanche along the gas–solid interface when a high electric field is applied, which is a potential issue that threatens the safe operations of advanced power electronic, electrical, and spacecraft applications. However, the underlying physical mechanisms for surface flashover development are still under investigation owing to the complex charge transport processes through the gas phase, solid phase, and gas–solid interface. In this study, the history of surface flashover theory in the last 50 years is introduced, and several key questions are reviewed from the perspective of the competing mechanisms of charge transport: the role of each phase in a surface flashover, the origin of surface charging, and effects of traps in solid on surface flashover. Then, some suggestions involve charge transport processes in each phase, and their correlations are put forward, and a predictable ‘charge transport competitive flashover model’ is proposed by clarifying the competing mechanisms of charge transport processes through multiple phases. This study summarises the history and hot topics of physical mechanisms of surface flashover proposed based on classic and recent progress and offers promising routes for developing a more precise surface flashover theory and improving surface flashover performances.

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Section: Gas-solid Interactionmentioning

confidence: 99%

“…); Surface states (Surface morphology [79–82], roughness [83–87], charging [88–92], surface gas [17, 24, 93, 94] etc. ); …”

Section: History Of Surface Flashover Modelsmentioning

confidence: 99%

Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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“…In this paper, calculations are firstly carried out for all substations except APS‐E during the calculation cycle. The target for the model is set at 50% of the neutral current operating standard (the standard is no more than 6 A for 500 kV transformers and no more than 4 A for 220 kV transformers) [29, 30]. In the model, the lower the resistance value when meeting the current operating criteria is considered the better protection solution.…”

Section: Systematic Protection Solutionmentioning

confidence: 99%

Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

Guo

Liu

et al. 2023

High Voltage

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In modern megacities, stray currents from metro systems intrude into multiple transformers' neutral points becoming a potential threat to the high‐capacity transformers. Neutral current anomalies are exacerbated in unprotected substations when we instal guards at single stations. This paper presents a system protection strategy for multiple substations affected by stray currents in modern megacities. The model, taking Shanghai as an example, includes the spatial distribution information of the urban electrical energy transmission structure, the power system, and the metro system. A Particle swarm algorithm is used to calculate the resistance values of the devices for each station. Further stability tests are performed to select the optimal protection solution. The results show that when protection is considered as a system, the protection runs well and the neutral current level remains below the unprotected level when the protection fails at a single station or multiple stations.

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“…Boron nitride, as the widest band width compound synthesized so far, is often used to prepare composites for use in electrical applications. In the literature, [ 32,33 ] the hydrophobic properties or insulating properties of the composites were significantly improved by adding the appropriate component of h‐BN to the composites. In addition, by introducing h‐BN as the filler phase of the material, It is equivalent to introducing a micron filled phase in addition to the nano‐filled phase.…”

Section: Introductionmentioning

confidence: 99%

A Novel Anti‐Flashover Superhydrophobic Coating with Self‐Assembly Characteristic of Surface Energy Differences

Wang

Zhang

et al. 2023

Macromol. Rapid Commun.

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Because of the versatility of superhydrophobic materials, they have attracted a lot of attention even in power electronics, transportation, engineering, and other fields. The volume fraction of fluorinated silicon oxide nanoparticles in superhydrophobic materials is one of the most important factors. Increasing the volume fraction will decrease the stability between the coating and the hydrophobic surface. Especially, the flashover voltage of the coating gradually decreases from 10 to 35 vol.%. Meanwhile, the flashover voltage dispersion of the coating increases drastically after 30 vol.%. In order to improve the electrical properties of the superhydrophobic coating, self‐assembly of surface energy differences strategy is proposed in this work. A binary filling phase of the coating is introduced by 2D boron nitride nanosheets and silicon oxide nanoparticles. Although Hexagonal boron nitride with high surface energy and low roughness, it will be spontaneously assembled and wrapped by silicon oxide nanoparticle based on surface energy differences, which forming a low surface energy filled phase. Experiment results prove that the flashover voltage of the superhydrophobic coating is optimized by the binary filling phase coating. This method offers new ideas for the selection of filling phase and application of superhydrophobic materials.

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Pollution morphology characteristics on a superhydrophobic surface and its pollution flashover voltage in DC electric field

Cited by 17 publications

References 32 publications

Surface flashover in 50 years: Theoretical models and competing mechanisms

Surface flashover in 50 years: Theoretical models and competing mechanisms

Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

A Novel Anti‐Flashover Superhydrophobic Coating with Self‐Assembly Characteristic of Surface Energy Differences

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