AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

Zhang, Zhijin; Qiao, Xinhan; Zhang, Yi; Liang, Tian; Zhang, Dongdong; Jiang, Xingliang

doi:10.1049/hve.2018.0002

Cited by 48 publications

(29 citation statements)

References 22 publications

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“…In addition, surface flashover is an important dielectric performance of insulating materials. In the process of surface flashover, arc develops along the dielectric surface [35]. Thus, the strength of arc ablation resistance can also be used to characterize the ablation during the surface flashover.…”

Section: Arc Ablation Resistancementioning

confidence: 99%

Mechanical and Dielectric Strength of Laminated Epoxy Dielectric Graded Materials

et al. 2020

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Laminated epoxy dielectric graded material is a commonly used insulating material with broad application prospects in power equipment. The interlaminar interfaces of laminated epoxy dielectric material between different layers form during its lamination process, and these interfaces are the crucial characteristic structures determining the mechanical and dielectric properties of laminated materials. Therefore, in order to gain a thorough understanding of physic properties behind a certain structural motif, it is necessary to study how these interfacial structures influence the mechanical and dielectric performances of graded materials. In this study, double-layered epoxy resin samples with an interlaminar interface are prepared to study their mechanical and dielectric strength. More importantly, the formation mechanism of the interface, as well as its influence on the mechanical and dielectric strength of this laminated material, is discussed. We found that a cross-linking reaction may take place between epoxy resins at the interlaminar interface, and the degree of cross-linking at the interface should be less than that in the bulk. The mechanical strength of the interlaminar interface is weaker than that of the bulk, and it is reduced by less than 40%. Moreover, the interlaminar interface is inclined to trap carriers, which improves the breakdown strength and arc ablation resistance of the laminated material. Our study of interlaminar interface properties could help in designing epoxy dielectric graded materials with better mechanical and dielectric properties.

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Section: Arc Ablation Resistancementioning

confidence: 99%

Mechanical and Dielectric Strength of Laminated Epoxy Dielectric Graded Materials

et al. 2020

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“…For silicone rubber insulators, de-hydrophobic pretreatment was necessary to facilitate their polluting [23].…”

Section: B Test Samplesmentioning

confidence: 99%

Comparison of AC Flashover Performance of Snow-Accreted Insulators Under Natural and Artificial Simulation Environments

Jiang

Guo

et al. 2020

IEEE Access

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The research and exploration on snow-accreted insulators have been performed in an artificial climate chamber. However, the differences in the distribution, density and compactness of snow accretion under natural and artificial simulation environments cause the flashover mechanism of snowcovered insulators to remain poorly understood. In the present work, a series of flashover tests were carried out on snow-coated glass and silicone rubber insulators in the climate chamber and at Xuefeng Mountain Natural Icing Test Base. The discrepancies in the electrical performance and flashover process of snowcovered insulators under two test environments were compared and analyzed. Results show that the arc flashover gradient of snow accreted insulator at high altitude site is higher than that in the laboratory because of the differences of the environmental parameters. Affected by the adiabatic effect and capillary action of snow layer, within the range of the study the flashover gradient of insulators covered with snow increases with the increasing in the snow thickness. The calculation of various forces applied on arcs during its propagation demonstrates that when the arc current is less than 0.2 A, the local arcs develop along the snow surface of the insulators under the action of an electrostatic force. As the current increases beyond 0.2 A, the thermal buoyancy is predominant, thereby causing arcs to levitate from the insulator surface.

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“…where, θ is the solution temperature (C), σθ is the volume conductivity [2], [3] at the temperature of θ⁰C (S/m), σ20 is the volume conductivity at the temperature of 20⁰C (S/m).…”

Section: Test Proceduresmentioning

confidence: 99%

Influence of Arc Flash Performance and ESDD Measurement of Bushings Tainted by Nitrates

Nikkitha,

Kalaivani

2019

IJEAT

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Tainting devastate the feat of bushings. Conductors are insulated inside the bushing that carry a high voltage current through a grounded enclosure. An aspiration is to study the pollution performance of bushings tainted by Nitrates.Arc flash tests of 1kV,11kV,17.5kV bushings are tainted by three types of salts such as NaCl, NaNO3, KNO3. The morsels are negotiated under habitual environment as per IEC 60507. The impact of tainting salts with their solubility on Equivalent Salt Deposit Density (ESDD) and bushings arc flash voltage are scrutinized. The effect of tainted salts on arc flash fruition, the sway of volume conductivity and Equivalent Salt Deposit Density (ESDD) under different percentages are also scrutinized. The research upshot reveals that the Equivalent Salt Deposit Density (ESDD) rate escalated with escalating salt content. When salt concentration gets escalated then conductivity also get escalated. When Equivalent Salt Deposit Density (ESDD) get Escalated then the arc flash voltage and leakage current get slacken. Finally, the graphs are drawn between ESDD and Arc flash voltage, Conductivity and Salt concentration, Arc flash voltage and Leakage current are obtained using MATLAB software.

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AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

Cited by 48 publications

References 22 publications

Mechanical and Dielectric Strength of Laminated Epoxy Dielectric Graded Materials

Mechanical and Dielectric Strength of Laminated Epoxy Dielectric Graded Materials

Comparison of AC Flashover Performance of Snow-Accreted Insulators Under Natural and Artificial Simulation Environments

Influence of Arc Flash Performance and ESDD Measurement of Bushings Tainted by Nitrates

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