Effect of superhydrophobicity on flashover characteristics of silicone rubber under wet conditions

Li, Yufeng; Jin, Haiyun; Nie, Shichao; Cheng, Tai; Gao, Nong

doi:10.1063/1.5012097

Cited by 14 publications

(10 citation statements)

References 23 publications

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“…Moreover, due to the low hysteresis of the coating contact angle, water droplets are easy to roll on the superhydrophobic surface. By reducing the surface energy or controlling the micro nano roughness of the solid surface, the fouling problem of the solid surface can be solved, which reflects the low adhesion and is also conducive to the sliding of the liquid on the superhydrophobic surface [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Research progress of superhydrophobic coatings based on silicone rubber surface

Xie

Zhao

Shi

2022

J. Phys.: Conf. Ser.

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Silicone rubber has excellent insulation properties such as good hydrophobic mobility and anti pollution flashover performance. It plays an important role in the power system and provides an important guarantee for the reliability of power supply. However, due to the erosion of various harsh environments, especially in wet environments such as rain and snow, a large amount of dirt and water are easily attached to the surface of insulating parts. It not only reduces its surface hydrophobicity and hydrophobic mobility, but also greatly shortens its service life. There are even serious leakage current problems. Especially in the low temperature environment, a lot of snow and flashover will occur at the accessories of the insulation parts. In order to solve this problem, super hydrophobic self-cleaning coating based on silicone rubber surface came into being. The preparation principle and model of superhydrophobic self-cleaning coating on silicone rubber surface are reviewed in this paper. By comparing different preparation methods, the advantages, disadvantages and application prospects are analyzed, and the existing problems and challenges are put forward according to the existing preparation technologies, so as to lay a theoretical foundation for preparing self-cleaning coatings with excellent performance in the future.

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Section: Introductionmentioning

confidence: 99%

Research progress of superhydrophobic coatings based on silicone rubber surface

Xie

Zhao

Shi

2022

J. Phys.: Conf. Ser.

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“…Moreover, Cao et al proposed critical water proportion to determine whether the partial arc will lead to insulation failure [19]. Through theoretical calculation and experimental observation, it was found that the water drops on the hydrophobic surface were elongated by the function of electric field force [20][21][22]. When placed in an AC electric field, the vibration frequency of water drop is faster than that of the applied electric field [22].…”

Section: Introductionmentioning

confidence: 99%

“…Through theoretical calculation and experimental observation, it was found that the water drops on the hydrophobic surface were elongated by the function of electric field force [20][21][22]. When placed in an AC electric field, the vibration frequency of water drop is faster than that of the applied electric field [22]. Compared with water drops on the upper surface of composite material, the force exerted on sheds edge water drops is more complicated, such as gravity, surface tension, and electric field force [23].…”

Section: Introductionmentioning

confidence: 99%

Full‐time domain deformation characteristics of water drop on sheds edge causing insulation failure of large‐diameter composite post insulators under heavy rainfall

Yang

Shang

Liao

et al. 2021

IET Science Measure & Tech

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Insulation failures caused by water drops deformation on insulator sheds edge greatly threaten the stable operation of power grid. However, only few studies have focused on water drops deformation characteristics on insulator sheds edge. In this paper, full-time domain deformation of water drop was defined. The rain tests were performed to study the deformation of water drops and obtain water drops parameters under DC voltage. The water drops deformation parameter was selected according to the state of water drops when arc is generated. A fluid-electric field coupling method is employed to establish simulation model to study the influence of water drops initial diameter, initial mass flow rate, DC voltage, and conductivity on water drops deformation. It is indicated that water drops maximum deformation length before first break in simulation is in good consistency with that obtained from rain tests. The water drops initial diameter, initial mass flow rate, and DC voltage significantly influence the deformation of water drops on sheds edge. Moreover, the water drops may even bridge adjacent sheds in some cases. In contrast, the effect of water drops conductivity on the water drops deformation is not apparent.

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“…The flashover voltage of an insulator is related to its geometrical parameters (length, profile, position, number of insulators and their connection, location, and type of insulator) and electrical parameters (longitudinal dielectric strength and surface electrical resistance). The degree of their individual or simultaneous effect on their electrical performance has been the subject of several research studies in order to end up in an insulator profile with the best electrical performance [3][4][5][6][7][8][9][10][11]. Figure 1c shows the support on which the 10 samples distributed in two rows are suspended vertically.…”

Section: Introductionmentioning

confidence: 99%

Constellation of Condensation and Raindrops and Its Effect on the DC Flashover Voltage of Inclined Silicone Insulation

et al. 2019

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The purpose of this paper is to characterize the arrangement of raindrops and natural condensation and its effect on the direct current voltage's flashover of a hydrophobic silicone insulating surface under variable inclination. Two devices have been realized, one for on-site exposure of insulation samples under rain and condensation, and the other for laboratory use in order to allow the variation of the angle of their inclination. The temporal evolution of the constellation of raindrops and natural condensation as well as the electrical discharge produced in the laboratory was visualized. The results emanated from the on-site investigation allowed the identification of the most reproducible type of arrangement of rainwater and natural condensation drops as well as the estimation of their respective volume. The results from the laboratory clearly show the existence of an interval of the insulation's inclination angle, which allows the best approximation of its electrical performance to what was obtained in the absence of these drops. Moreover, these same results also inform us about some very critical situations to avoid regarding the insulation by a judicious choice of its inclination angle. Energies 2019, 12, 3549 2 of 17Static and dynamic models of flashover of hydrophilic or hydrophobic insulators have been proposed by several researchers to understand the phenomenon of insulator's flashover and its design [12,13]. Their improvement still requires the introduction in these models of other parameters for its better characterization. During the last five decades, a very high taxation of silicone insulation compared to ceramics has been observed in power transmission lines [14,15]. This is justified by the multiple advantages favoring these polymers (lightness, very good hydrophobicity, and its transfer to pollution, as well as very high resistance to pollution and vandalism).On the other hand, the most cited disadvantage of such isolations is the loss of hydrophobicity of their surface and their long-term alteration following the recurrence and the duration of the phenomenon of condensation or natural rain [16,17]. This is due to partial electrical discharges and flashover caused by drops of rainwater or dew deposited on their surface under service voltage. In these investigations, the electrical conductivity of the spray solution or the intensity and the speed of rain falling on the insulators' surface were of interest to most researchers. On the other hand, the geometrical parameters of the fog or rain drops coming into contact with the insulator's surface had attracted very little attention of the researchers [18]. Among these geometric factors that influence the performance of a polymer insulator, we can mention the number of water drops, their size, their angle of fall, their impact speed on the surface, their rebound or bounce, their burst, the distance between the drops, their arrangement along the perimeter, and the leakage path of the insulator. Individually or combined, the effect of these parameters...

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Effect of superhydrophobicity on flashover characteristics of silicone rubber under wet conditions

Cited by 14 publications

References 23 publications

Research progress of superhydrophobic coatings based on silicone rubber surface

Research progress of superhydrophobic coatings based on silicone rubber surface

Full‐time domain deformation characteristics of water drop on sheds edge causing insulation failure of large‐diameter composite post insulators under heavy rainfall

Constellation of Condensation and Raindrops and Its Effect on the DC Flashover Voltage of Inclined Silicone Insulation

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