Study on the Law of Water Drop Movement on the Surface of Insulators under AC and DC Electric Field

Cao, Wen; Xue, Hao; Du, Yan; Yang, Hao; Zhao, Long; Guo, Xiang; Wang, Yang; Shen, Wei; Lv, Zengpeng

doi:10.1109/ceidp47102.2019.9009765

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…According to the experimental results, the mechanism of dynamic behaviour for water droplets under AC electric field is analysed in this section. By characterising the movement of the water droplet from the initial stage of the voltage application to the pre‐flashover stage, we divide the dynamic behaviours of the water droplet under AC step‐on voltage into three stages [26], as shown in Figure 13. In the first stage, there is the subtle high‐frequency oscillation on the top of the water droplet at the beginning of voltage application as depicted in Figure 13a.…”

Section: The Experimental Results and Theoretical Analysismentioning

confidence: 99%

“…The experimental results show that an initial state of the water droplet is a semi‐elliptic shape, as shown in Figure 10a. Then, we divide the movement process of the water droplet under DC voltage into three stages [26], as shown in Figure 10b–d.…”

Section: The Experimental Results and Theoretical Analysismentioning

confidence: 99%

“…Then, the voltage applied over the sample is changed to 0.3 kV boost with a duration of 10 s at each timestep until flashover. In this work, the speed of the camera used for recording is 1000 frames/s [26].…”

Section: Experimental Systemmentioning

confidence: 99%

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The effect of dynamic behaviours of the water droplet on DC/AC flashover performance on silicone rubber surface: Experiment, simulation and theoretical analysis

Cao

Xue

Shen³

et al. 2021

High Voltage

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It is usually seen that DC flashover voltage of the water droplet on the surface of silicone rubber (SIR) composite insulator is lower than AC flashover voltage. It is necessary to study the mechanisms and influencing factors of the surface properties. In this article, experiments are performed to study the moving processes of the water droplet and the influences of its dynamic behaviours on flashover voltage under DC/AC electric field. Besides, an electrohydrodynamic coupling method is employed to establish the simulating model. Moreover, the theoretical physical model is established to reveal the mechanisms of dynamic behaviours of a droplet. It is indicated that the simulation results are in good consistency with the experimental data. The elongation behaviours of a droplet on the surface of a composite insulator can influence the homogeneity of the electric field distribution along the sample's surface. It is shown that the different dynamic behaviours and flashover performances for a single water droplet on the SIR surface are both affected by the volume of the droplet and the type of voltage applied. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: The Experimental Results and Theoretical Analysismentioning

confidence: 99%

Section: The Experimental Results and Theoretical Analysismentioning

confidence: 99%

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The effect of dynamic behaviours of the water droplet on DC/AC flashover performance on silicone rubber surface: Experiment, simulation and theoretical analysis

Cao

Xue

Shen³

et al. 2021

High Voltage

Self Cite

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“…The water droplets present on the silicone rubber insulator surface tend to oscillate under the presence of electric field, this oscillation will alter the electric field distribution and cause localized surface flashover [27]. Fig.…”

Section: E Hydrophobicity Loss and Recovery Characteristics Of Silico...mentioning

confidence: 99%

Understanding the Surface Condition of Silicone Rubber Nanocomposite Due to Corona Aging Using AFM Imaging and LIBS Spectroscopy

Thangabalan

Neelmani

Vasa

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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Silicone rubber insulators undergo degradation when they are exposed to corona discharges. The present study explores the surface degradation behavior of silicone rubber alumina nanocomposites due to corona ageing using highfrequency AC voltage. The electric field distribution on the sample surface during corona ageing is simulated using COMSOL. The change in silicone rubber functional group is studied using Fourier transform infrared spectroscopy (FTIR) analysis. The influence of corona ageing time on the surface roughness recovery of silicone rubber nano alumina composites is studied using an atomic force microscope (AFM). The elemental distribution behavior and change in the emission spectra persistence time are analyzed during recovery period of corona-aged silicone rubber nanocomposites using Laser-Induced Breakdown Spectroscopy (LIBS) technique. The addition of alumina nanofiller to the silicone rubber improves the resistance to ageing due to corona discharge. Loss and recovery of hydrophobic property of silicone rubber due to corona aging were determined using static contact angle measurement. The results show a direct correlation between the contact angle and the surface roughness recovery characteristics. They indicate that the nanocomposite having a 5 wt% alumina content exhibits the highest resistance to corona discharge with least surface damage. Furthermore, fast recovery was observed in the first few hours after corona ageing, and most samples eventually regained their properties after about 8 hours of recovery time.

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“…Qi Li found similar laws on the surface of the conductor by using the finite element method and further found that the morphology of water droplets on the surface of the metal ball changes in hemispherical, flat and conical cycles [29]. In recent years, it has been found that the droplet on the insulation board can be divided into part high-frequency vibration and whole left-right fluctuation under the action of power frequency AC, deflect in a certain direction under the action of DC, and then recover [30]. Mingjie Luan did some related studies and further found that the elongation of water droplets on the surface of silicon rubber insulators increased with the increase of their volume and also significantly increased with the increase of electric field strength [31].…”

Section: Introductionmentioning

confidence: 99%

The Electric Field Evaluation for Vibrating Rain Droplets on the Overhead Line Conductors

Meng

et al. 2023

Energies

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The water droplets on the surface of the overhead line (OHL) conductors are subject to an intensive electric field, which induces electric force on the charged liquid surface. Under the combined action of the surface tension as well as the electric force, movement and deformation can be observed on those water droplets. These result in a re-distribution of charge density on the liquid surface and therefore a re-distribution of electric force. In this paper, in order to strengthen the understanding of this complex multi-physics problem of interaction and mutual coupling, the vibration characteristics of water droplets under alternating electric fields is studied using the finite element method (FEM). Parameters such as the volume size of the water droplet, static/dynamic contact angle between the water droplet and conductor surface and voltage level are studied in relation to the vibration characteristics. The reproducible correlation between the phase and amplitude of the water droplet vibration on the surface of the conductor and the applied voltage is established. According to the calculated instantaneous electric field strength, it is explained that protrusions such as water droplets are the starting point of corona discharge.

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Study on the Law of Water Drop Movement on the Surface of Insulators under AC and DC Electric Field

Cited by 4 publications

References 11 publications

The effect of dynamic behaviours of the water droplet on DC/AC flashover performance on silicone rubber surface: Experiment, simulation and theoretical analysis

The effect of dynamic behaviours of the water droplet on DC/AC flashover performance on silicone rubber surface: Experiment, simulation and theoretical analysis

Understanding the Surface Condition of Silicone Rubber Nanocomposite Due to Corona Aging Using AFM Imaging and LIBS Spectroscopy

The Electric Field Evaluation for Vibrating Rain Droplets on the Overhead Line Conductors

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