Site experimental study on suspension-tension arrangement for preventing transmission lines from icing tripping

Jiang, Xingliang; Zhu, Minggang; Dong, Liang; Hu, Qin; Zhang, Zhijing; Hu, Jianlin

doi:10.1016/j.ijepes.2020.105935

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…However, some cases may demand that insulators are installed in other orientations and therefore designed for optimum performance at such orientation angles. A typical example is the strain insulator configuration (suspensiontension type) which is designed to support extraordinary and irregular line conductor tensile loads, such as in sharp corners and dead ends whilst enhancing the flashover voltage of the same length of insulator string when contaminated [24,25]. This study investigated the need for a modified insulator design in accordance with the angle of installation.…”

Section: F Orientation Angle Testmentioning

confidence: 99%

Performance Evaluation of Outdoor High Voltage Glass Insulators in High Pollution Industrial Areas Using Simulated Acid Rain Contamination

2022

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A suitable, non-standard method for artificial pollution testing using simulated acid rain pollution in a laboratory was developed in this work. The method is applicable to a wide range of climatic conditions and rain acidities. The established method adopts the solid layer principle in the preparation and application of acid rain of various pollution severities to test insulators. Glass cap and pin insulators were contaminated, assembled into strings of two discs and flashover tests carried out on the strings at different orientation angles. The frequency of flashover occurrence, maximum withstand degree of pollution, effect of pollution severity, and effect of orientation angle were investigated. Test results showed that the orientation angle plays little or no role in the flashover of the insulators under dry conditions. Under wet conditions, the insulators performed better when inclined. Flashover voltage was observed to be inversely proportional to time while the time to flashover was inversely proportional to the pollution severity. The probability of flashover increases with an increase in voltage for a fixed pollution severity or increase in pollution severity for a fixed voltage level. This indicates that the probability of flashover is a function of the product of pollution severity and voltage.

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Section: F Orientation Angle Testmentioning

confidence: 99%

Performance Evaluation of Outdoor High Voltage Glass Insulators in High Pollution Industrial Areas Using Simulated Acid Rain Contamination

2022

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“…where r0 is the arc radius. The arc radius increases with the decreasing air pressure, which can be expressed as follows [29]   (8) where P is the pressure at high altitude and P0 is the standard atmospheric pressure.…”

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%

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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“…It measures physical parameters such as line tension, dip, swing angle, and micro-meteorological parameters such as temperature, humidity, wind speed by sensors. Then in the background software of the master station, the equivalent ice thickness is calculated combined with the mechanical model to determine the icing status [9][10][11]. Zhao et al [12] developed an automatic icing warning system that calculated the thickness utilising stress measurement.…”

Section: Introductionmentioning

confidence: 99%

“…the master station, the equivalent ice thickness is calculated combined with the mechanical model to determine the icing status [9][10][11]. Zhao et al [12] developed an automatic icing warning system that calculated the thickness utilising stress measurement.…”

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confidence: 99%

Newly designed identifying method for ice thickness on high‐voltage transmission lines via machine vision

et al. 2021

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The icing of transmission lines will bring considerable challenges to the safe operation of the power grid. Therefore, a novel method combines machine vision and machine learning algorithms for identifying the ice thickness on high-voltage transmission line (HVTL) as proposed herein. First, noise and background interference in the image are filtered, and the grey image is used as input. Then, the algorithms of improved Canny edge detection, Hough transform, improved K-means clustering, and least-squares fitting are adopted in turn to locate the edges of conductors. Finally, according to the distance mapping model based on monocular vision, the ice thickness of the conductor is determined by calculating the width difference before and after icing. The experimental results show that the proposed method can accurately locate the edge of the conductor in both field and experimental environments. Moreover, it can ensure ideal effects under different illumination and hardly not be affected by distortion in both horizontal and vertical directions. Besides, the distance mapping model can map the pixel distance to the actual distance with high precision, no matter whether the background is simple or complex, and the calculated ice thickness has only a small deviation compared to the actual value. In addition, the proposed method shows high reliability and effectiveness when various interference such as different backgrounds, uneven icing, height difference changes, conductor movement, contrast changes, and conductor sag occur.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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Site experimental study on suspension-tension arrangement for preventing transmission lines from icing tripping

Cited by 11 publications

References 12 publications

Performance Evaluation of Outdoor High Voltage Glass Insulators in High Pollution Industrial Areas Using Simulated Acid Rain Contamination

Performance Evaluation of Outdoor High Voltage Glass Insulators in High Pollution Industrial Areas Using Simulated Acid Rain Contamination

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

Newly designed identifying method for ice thickness on high‐voltage transmission lines via machine vision

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