Study on conductive ions distribution in icicles of ice-covered insulators

Liu, Yanqing; Shu, Lichun; Jiang, Xingliang; Hu, Qin; Yang, Hang; Zhou, Yu; Zhu, Minggang

doi:10.1016/j.ijepes.2019.105567

Cited by 12 publications

(14 citation statements)

References 14 publications

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“…Currently, there is no relevant article on the theoretical calculation of conductive ions distribution in the icicle as well as the melting water conductivity during melting period. Based on the previous research results [10], the conductive ions content at different positions of the icicle as well as the melting water conductivity is calculated theoretically. The calculated results are in good agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Calculation of conductive ions distribution in icicle and melting water conductivity

Liu

Shu

et al. 2021

High Voltage

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The flashover problem of ice-covered insulators has seriously affected the safe operation of transmission lines. Numerous researches have shown that the high conductivity water film on the surface is determined by the conductive ions distribution in the icicle which is the key factor affecting the flashover voltage of ice-covered insulators. In our previous work, the conductive ions distribution in the icicle has been obtained through experiments and simulation analysis. In order to calculate the conductivity of the water film, the conductive ion-specific content at different positions in the icicle has been calculated mathematically. In addition, based on the simulation of icicle melting process, the icicle melting process is analysed, and the melting water conductivity of the icicle is calculated. Moreover, melting ice test is carried out in artificial climate chamber to verify the validity of the calculation method. The calculated results are in good agreement with the test results. The conclusion obtained here would provide theoretical basis for establishing a flashover model of ice-covered insulators. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Introductionmentioning

confidence: 99%

Calculation of conductive ions distribution in icicle and melting water conductivity

Liu

Shu

et al. 2021

High Voltage

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“…Ice flashover is one of the major events that threatens the safe and stable operation of power systems. Many reports on power outages caused by icing in overseas have emerged [1]- [3]. China is a country that is prone to severe icing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crystallization Effect During Icing Water Phase Transition on the Flashover Characteristics of Ice-Covered Insulators

Jiang

Yang

et al. 2020

IEEE Access

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The crystallization effect during the phase transition of icing water has a significant impact on the electrical performance of an ice-covered insulator. However, the spatial distribution of conductive ions in the ice layer remains poorly understood. In this study, the crystallization effect was confirmed through a condensation test of the potassium permanganate solution. The influence of freezing water conductivity, ice thickness and equivalent salt deposit density on the spatial distribution of conductive ions was determined by a triangular ice sample, wherein the effect on the flashover characteristics of ice-covered insulator was investigated. Results show that MnO − 4 migrates to the unfrozen area during freezing, thus accumulating on the droplet top. The conductivity of melted water on the exterior surface of an ice sample is considerably higher than that of icing water. The former can reach a maximum of 5.7 times the latter when the freezing water conductivity method is adopted. This value is 9.7 for a polluted ice sample. A highly conductive water film forms on the insulator surface because of the crystallization effect in the melting period, thereby improving the leakage current and reducing the residual ice resistance, which results in the decrease of flashover voltage.INDEX TERMS Crystallization effect, icing water, ice-covered insulator, leakage current, flashover voltage.

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“…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%

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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Study on conductive ions distribution in icicles of ice-covered insulators

Cited by 12 publications

References 14 publications

Calculation of conductive ions distribution in icicle and melting water conductivity

Calculation of conductive ions distribution in icicle and melting water conductivity

Influence of Crystallization Effect During Icing Water Phase Transition on the Flashover Characteristics of Ice-Covered Insulators

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

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