Anti-icing performance of RTV coatings on porcelain insulators by controlling the leakage current

Xu, Zhonghai; Jia, Zhidong; Li, Zhining; Wei, Xiaosheng; Guan, Zhicheng; MacAlpine, Mark; Zhao, Yuming; Yan, Lifeng

doi:10.1109/tdei.2011.5931063

Cited by 40 publications

(19 citation statements)

References 12 publications

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“…Doping with carbon to make the coatings semiconducting, with sufficient current flow to prevent ice formation [82] Blending with materials that give sub-micrometer scale features that render the surfaces super-hydrophobic, selfcleaning and ice phobic [83] Problems with continuous current flow and power consumption through a semiconducting RTV coating can be addressed by introducing air gaps, for example coating only the bottoms of suspension disk units [82].…”

Section: Insulator Coatingsmentioning

confidence: 99%

Insulator flashover under icing conditions

Farzaneh

2014

IEEE Trans. Dielect. Electr. Insul.

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Atmospheric ice accretion, combined with pollution, has been recognized as a significant risk factor in the reliability of line and station insulators in cold climate regions. Flashovers occurring on ice-and snow-covered insulators result from combinations of a number of factors and parameters. Electric fields modify the structure of ice, the shape and direction of icicle elongation, the distribution of liquid water and the geometry of air gaps that break up the continuous ice surface. Electric field strength and voltage polarity as well as corona space charge and ionic wind have demonstrable influences on the flashover process. Insulator icing flashover is also affected by changes in air temperature and several other environmental and meteorological conditions including ice type and structure. The presence of surface pollution and the rejection of ions from solid to liquid layers during the freezing and melting process also play a central role in the icing flashover of insulators, which can occur at normal operating voltage under the most adverse conditions. This paper presents an overview of these phenomena and describes the interactions that lead to the initiation and development of discharges on the ice surfaces covering the insulators, as well as their evolution to flashover. The lecture also includes the modeling of these phenomena, leading to successful prediction of the critical flashover voltage as well as to insight into the most practical solutions for improved insulator design and mitigating icing flashovers.

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Section: Insulator Coatingsmentioning

confidence: 99%

Insulator flashover under icing conditions

Farzaneh

2014

IEEE Trans. Dielect. Electr. Insul.

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“…• Doping with carbon to make the coatings semiconducting, with sufficient current flow to prevent ice formation [82] • Blending with materials that give sub-micrometer scale features that render the surfaces super-hydrophobic, selfcleaning and icephobic [83] Problems with continuous current flow and power consumption through a semiconducting RTV coating can be addressed by introducing air gaps, for example coating only the bottoms of suspension disk units [82].…”

Section: B Insulator Coatingsmentioning

confidence: 99%

Insulator icing flashover

Farzaneh

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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the insulator is a kind of important electric components, because it plays a role in electrical insulation and plays a supporting role in mechanical, power system and even the development of the whole society to a higher degree of dependence on the performance of insulators, the requirements are also rising. However, in recent years, China's domestic air pollution is serious, the weather conditions are complex, the icing flashover phenomenon has become a serious performance of insulator safety accidents. However, the proposed super hydrophobic materials in this paper, not only the anti icing flashover performance is better than the commonly used coating, and preparation process is sample, high performance, and low cost, which is expected to become a substitute for insulator coating now. the super hydrophobic coating is considered to be one of the important methods to solve the problem of flashover electrical equipment, so the study of high hydrophobicity flashover, super hydrophobic coating with high performance, simple process, low cost plays an important role in electrical equipment and power industry. In this paper, we will use a kind of method which is more powerful, graphene was prepared by electrochemical stripping and poly-two methyl siloxane in a certain proportion to prepare superhydrophobic surface. In this paper, the preparation of superhydrophobic surface, not only has excellent self-cleaning performance, but also has a very low corrosion current density. It is surprising that the superhydrophobic surface prepared by this method has good mechanical stability, and its surface can maintain the super hydrophobicity after the strong impact of the outside world. The method mentioned in this paper is not only capable of preparing a set of super hydrophobic surface self cleaning,mechanical stability is stable as a whole, it also provides a new idea for anti icing flashover of electrical equipment. 1. Introduction With the development of the electric power industry and the gradual improvement of the voltage level, the electrical equipment is playing a more and more important role in people's daily production and life. Of which the insulator is an important part of power system, however, the phenomenon of icing flashover has a great influence on the mechanical and electrical properties of insulators, which will threaten the stability and security of power system operation, resulting in huge economic losses. Take snow disaster in South China in 2008 as an example, the ice coating accidents spread to 13 provinces, State Grid economic losses in the accident up to 10 billion 450 million Yuan, and in daily life, line trip, outage accidents also occur caused by icing [1] , it causes a great impact on people's life. Therefore, it has become one of the most urgent problems to solve the problem of icing flashover. However, there are still a lot of defects in the deicing and anti icing methods currently used, and the efficiency is low and the energy consumption is large. Super hydrophobic coating is a kind of water ela...

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“…It is fortunate that heavy ice accretion problems have been mitigated by using polymeric coatings. Guan et al [18,19] prepared a semiconducting RTV anti-icing coating for insulator by adding conducting particles (carbon fibers or graphite), and the coating showed good anti-icing performance. Inspired by ice skating, a series of aqueous lubricating layers on the original anti-icing coatings ware fabricated, which will reduce the adhesion between ice and solid substrates, and ice formed atop of a solid surface slides away under its gravity or an action of natural wind [24−26].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Preparation and Anti-icing Performance of Super-hydrophobic Surface on Aluminum Conductor

Jin

Nie

et al. 2018

Chinese Journal of Chemical Physics

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Aluminum is widely used in transmission lines, and the accumulation of ice on aluminum conductor may inflict serious damage such as tower collapse and power failure. In this study, super-hydrophobic surface (SHS) on aluminum conductor with micro-nanostructure was fabricated using the preferential etching principle of crystal defects. The surface microstructure and wettability were investigated by scanning electron microscope and contact angle measurement, respectively. The icing progress was observed with a self-made icing experiment platform at different environment temperature. The results showed that, due to jumping and rolling down of coalesced droplets from SHS of aluminum conductor at low temperature, the formation of icing on SHS could be delayed. Dynamic icing experiment indicated that SHS on aluminum conductor could restrain the formation of icing in certain temperature range, but could not exert influence on the accumulation of icing. This study offers new insight into understanding the anti-icing performance of actual aluminum conductor.

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Anti-icing performance of RTV coatings on porcelain insulators by controlling the leakage current

Cited by 40 publications

References 12 publications

Insulator flashover under icing conditions

Insulator flashover under icing conditions

Insulator icing flashover

Investigation on Preparation and Anti-icing Performance of Super-hydrophobic Surface on Aluminum Conductor

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