Effect of ultrasonic fog on AC flashover voltage of polluted porcelain and glass insulators

Jiang, Xingliang; Dong, Bingbing; Hu, Qin; Yin, Fanghui; Xiang, Ze; Shu, Lichun

doi:10.1109/tdei.2013.6508744

Cited by 28 publications

(3 citation statements)

References 10 publications

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“…However, in artificial pollution or natural-pollution tests, the pollution degree has a significant impact on the pollution flashover voltage of composite insulators. As indicated in previous studies, the flashover voltage V f of composite insulator decreases with the pollution degree and their relationship can be expressed as [21,22]:…”

Section: The Proposal Of a New Experimental Setupmentioning

confidence: 99%

Flashover characteristics of a hydrophobic surface covered by water

Cao¹,

Shao²,

Wu³

et al. 2020

J. Phys. D: Appl. Phys.

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Due to their hydrophobic properties, composite insulators have excellent anti-pollution flashover performance and have been widely used in power systems. For a better understanding of the flashover characteristics of a hydrophobic surface at wet conditions, the hydrophobic surface is covered with water droplets and water film, respectively, in this paper. The initiation and development of partial arc are observed by an ultrahigh-speed camera and the leakage current is also recorded. It is found that there exists a critical water proportion for a given dry band length and water volume conductivity. Beyond this water proportion, the partial arc does not necessarily lead to the flashover. On the contrary, flashover will take place right after the occurrence of partial arc. Furthermore, it is also found that when the water proportion is below the critical water proportion, the flashover voltage is barely related to the volume conductivity and the flashover voltage generally decreases with the increase of water volume and water droplet number. The results obtained are of great significance to understand the flashover process of hydrophobic surfaces.

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Section: The Proposal Of a New Experimental Setupmentioning

confidence: 99%

Flashover characteristics of a hydrophobic surface covered by water

Cao¹,

Shao²,

Wu³

et al. 2020

J. Phys. D: Appl. Phys.

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“…The average value and standard deviation formulas of the flashover voltage are shown in Formula (5) and (6). When considering the flashover voltage under DC positive polar power source is larger than that of DC negative polar case, only the comparison of pollution flashover under DC negative polar and AC voltage power source is discussed in this chapter.…”

Section: The Influence Of Conductivitymentioning

confidence: 99%

Natural Contamination and Surface Flashover on Silicone Rubber Surface under Haze–Fog Environment

et al. 2017

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Anti-pollution flashover of insulator is important for power systems. In recent years, haze-fog weather occurs frequently, which makes discharge occurs easily on the insulator surface and accelerates insulation aging of insulator. In order to study the influence of haze-fog on the surface discharge of room temperature vulcanized silicone rubber, an artificial haze-fog lab was established. Based on four consecutive years of insulator contamination accumulation and atmospheric sampling in haze-fog environment, the contamination configuration appropriate for RTV-coated surface discharge test under simulation environment of haze-fog was put forward. ANSYS Maxwell was used to analyze the influence of room temperature vulcanized silicone rubber surface attachments on electric field distribution. The changes of droplet on the polluted room temperature vulcanized silicone rubber surface and the corresponding surface flashover voltage under alternating current (AC), direct current (DC) positive polar (+), and DC negative polar (−) power source were recorded by a high speed camera. The results are as follows: The main ion components from haze-fog atmospheric particles are NO 3 − , SO 4 2− , NH 4 + , and Ca 2+ . In haze-fog environment, both the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD) of insulators are higher than that under general environment. The amount of large particles on the AC transmission line is greater than that of the DC transmission line. The influence of DC polarity power source on the distribution of contamination particle size is not significant. After the deposition of haze-fog, the local conductivity of the room temperature vulcanized silicone rubber surface increased, which caused the flashover voltage reduce. Discharge is liable to occur at the triple junction point of droplet, air, and room temperature vulcanized silicone rubber surface. After the deformation or movement of droplets, a new triple junction point would be formed, which would seriously reduce the dielectric strength of room temperature vulcanized silicone rubber.

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“…In this paper, the corrosion mechanisms in the cap and pin of porcelain insulators are described and the effects of corrosion on the lifetime of the insulators are discussed. The corrosion mechanism of the cap is mainly galvanic corrosion, while that of the pin is primarily electrolytic and crevice corrosion, as well as galvanic corrosion [2,3]. Consequently, dependency of corrosion on geographical factors has also been presented while focusing on preventive techniques.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Corrosion in Porcelain Insulators and Its Effect on the Lifetime

et al. 2020

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Porcelain insulators should be exchanged periodically, but their lifetime is not clearly defined. One factor that affects service life is corrosion occurring at the pin and cap—each of which is made of iron with a zinc coating. A number of porcelain insulators used for different lengths of time in different locations are gathered, and the corrosion mechanisms of the cap and pin are investigated. The corrosion mechanism of the cap is mainly galvanic corrosion while that of the pin is primarily electrolytic and crevice corrosion as well as galvanic corrosion. Although time is an important factor in corrosion, it is found that corrosion is more influenced by geographical factors. Since the amount of acid rain and sea salt—each of which causes rapid rusting—is dependent on geographical factors, the location of where porcelain insulators are installed should be considered when predicting their lifetime. Theoretically, if there is only galvanic corrosion occurring, the expected lifetime is 56 years in an industrial area when the zinc coating has a thickness of 75 µm. Previous articles dealing with aging have predicted the maximum lifetime of porcelain insulators used in Korea to be approximately 30 years. To prolong the lifetime of porcelain insulators, further study is required in which the use of zinc alternatives, or waterproof coatings (in addition to the zinc coating), could be examined.

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Effect of ultrasonic fog on AC flashover voltage of polluted porcelain and glass insulators

Cited by 28 publications

References 10 publications

Flashover characteristics of a hydrophobic surface covered by water

Flashover characteristics of a hydrophobic surface covered by water

Natural Contamination and Surface Flashover on Silicone Rubber Surface under Haze–Fog Environment

Mechanism of Corrosion in Porcelain Insulators and Its Effect on the Lifetime

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