Large-scale numerical electrostatic analysis for performance evaluation of insulators with accreted icicles

Takei, Amane; Mizuma, Takeihito; Akatsuka, Motoki; Yamada, Tomonori

doi:10.3233/jae-170168

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…Considering the influence of the pressure on the electric field, the relationship between the arc gradient and the current can be approximated by the following equation [21], [25]: The pressure as a function of the altitude can be depicted by the following: The temperature of the partial arc during the discharge development is generally 5000-6000 ℃, resulting in a sharply increase in the temperature of the surrounding air. From equation (11), the thermal buoyancy decreases as the temperature increases. Assuming that the air temperature around the arc is basically the same as that of the arc, the arc is considered to be 5000 ℃, and the forces are calculated by equation (11), as shown in Figure 11.…”

Section: B Flashover Process Of the Insulators Covered With Natural mentioning

confidence: 99%

“…From equation (11), the thermal buoyancy decreases as the temperature increases. Assuming that the air temperature around the arc is basically the same as that of the arc, the arc is considered to be 5000 ℃, and the forces are calculated by equation (11), as shown in Figure 11.…”

Section: B Flashover Process Of the Insulators Covered With Natural mentioning

confidence: 99%

“…A systematic investigation on ice-covered insulators have been carried out and achieved important advances in the formation mechanism of ice accretion [5]- [7], electrical properties [8]- [10] and discharge development [11]- [12]. However, less attention has been paid to the effect of snow accumulation on the external insulation of transmission lines.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: B Flashover Process Of the Insulators Covered With Natural mentioning

confidence: 99%

Section: B Flashover Process Of the Insulators Covered With Natural mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Especially in the process of icing growth and melting, the surface of icicles and insulators is wet, and its conductive ions can migrate freely to form conductive paths, resulting in a significant weakening of the electrical strength of insulators. So icicle growth and melting state are more likely to cause flashover accidents of insulators, which has a great impact on the safe and stable operation of the power system [8], [13]- [17]. Reference [13]- [14] found that the corona discharge intensity at the tip of insulator icicle is mainly affected by the parameters of icicle length and the conductivity of the meltwater, and there may be more prone to ice melting flashover in the critical bridging state.…”

Section: Introductionmentioning

confidence: 99%

Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

et al. 2019

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Icicle will cause serious distortion of insulator electric field, weaken its voltage strength, and easily cause insulator flashover. Previous studies have shown that the longer the length of icicles on insulator, the greater the possibility of electric flashover. Then, it is of great theoretical significance and practical value to study the image identification technology of icicle length of iced insulators. Firstly, the growth mechanism and structural characteristics of insulator icicles are discussed in this paper, and the image acquisition method of iced insulator is discussed. Secondly, the methods of saliency detection and color feature analysis are used to extract the region of icicle and insulator sheds respectively, then, the icicle structure on insulator is obtained by the difference calculation of above two images. Meanwhile, the pixel curve of the iced insulator image is processed by Fourier transform, and the reference size of insulators icicle is obtained by calculating the length of the shed spacing. Finally, a practical case about iced insulators in substations is analyzed in detail, which proves the effectiveness of the method proposed in this paper.

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Large-scale numerical electrostatic analysis for performance evaluation of insulators with accreted icicles

Cited by 2 publications

References 1 publication

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

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

Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

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