Study of anti-icing performance of insulator strings bottom-coated with semiconductive silicone rubber coating

Wei, Xiaosheng; Jia, Zhidong; Sun, Zhenting; Liao, Weiyan; Qin, Yu; Guan, Zhicheng; Xu, Zhonghai; Peng, Xiangyang

doi:10.1109/tdei.2012.6396966

Cited by 31 publications

(6 citation statements)

References 24 publications

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“…The climate chamber mainly consisted of an internal chamber with a size of 1 × 1 × 1 m 3 , a built-in freezer for storing cold water, and a control panel. Considering that the aluminum conductor surfaces were impacted by raindrops with a certain velocity in the natural environment, spray droplets with an initial speed were used to simulate the formation of ice, which is also a common way of generating micron-sized droplets in the literatures. − A nozzle was installed at the top of the chamber to generate spray droplets. The nozzle was connected to the built-in freezer, where the water temperature was adjusted to 2 ± 1 °C through the control panel.…”

Section: Methodsmentioning

confidence: 99%

Anti-Icing Mechanism for a Novel Slippery Aluminum Stranded Conductor

Xiang

Yuan

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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The icing of transmission conductor seriously threatens the safe operation of power grids. Slippery lubricant-infused porous surface (SLIPS) has shown great potential for anti-icing applications. However, aluminum stranded conductors have complex surfaces, and the current SLIPSs are almost prepared and studied on small flat plates. Herein, the construction of SLIPS on the conductor was realized through anodic oxidation and the anti-icing mechanism of the slippery conductor was studied. Compared to the untreated conductor, the SLIPS-conductor reduces the icing weight by 77% in the glaze icing test and shows very low ice-adhesion strength (7.0 kPa). The excellent anti-icing performance of the slippery conductor is attributed to the droplet impact dynamics, icing delay, and lubricant stability. The dynamic behavior of water droplets is most affected by the complex shape of the conductor surface. Specifically, the impact of the droplet on the conductor surface is asymmetric and the droplet can slide along the depression in low-temperature and high-humidity environments. The stable lubricant of SLIPS increases both the nucleation energy barriers and the heat transfer resistance, which greatly delays the freezing time of droplets. Besides, the nanoporous substrate, the compatibility of the substrate with the lubricant, and the lubricant characteristics contribute to the lubricant stability. This work provides theoretical and experimental guidance on anti-icing strategies for transmission lines.

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Section: Methodsmentioning

confidence: 99%

Anti-Icing Mechanism for a Novel Slippery Aluminum Stranded Conductor

Xiang

Yuan

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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“…This equation ignores the performance of CNT network in SMCNT. Therefore, the network efficiency parameter (η) is added to equation (10)…”

Section: Modeling Techniquementioning

confidence: 99%

“…8 Also, RTV silicone rubber coatings filled with semiconducting nanoparticles are expected to inhibit ice accumulation on outdoor insulators. [9][10][11][12] Silicone rubber incorporated with carbon nanoparticles was used as a coating for high voltage porcelain insulators in Ref. [12].…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity Modeling and Fabrication of Carbon Nanotubes/Silicone Rubber Composites for High Voltage Insulators in Regions With a Polluted Atmosphere

Mohammadnabi

Rahmani

Moghaddam

2022

Journal of Reinforced Plastics and Composites

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The condensation mechanism of the insulators’ surface, increase the surface electrical conductivity. The electrical conductivity of the insulator creates a high level of leakage current and causes the failure. Difference between the dew point and the surface temperature of the insulator which occur due to radiative cooling mechanism, is the major reason of the moisture condensation on the polluted insulator surface. To compensate for the temperature difference, carbon nanotubes (CNTs) are being added to the silicone rubber housing material. The main idea of this research is based on generating joule heating by reducing the surface resistance of high voltage insulators. For this purpose, a developed model based on Halpin–Tsai formulation for tensile modulus of nanocomposites is joined with the conventional power-law model for the effective electrical conductivity of silicone rubber matrix carbon nanotube composite (SMCNT). SMCNT samples are prepared with the addition of various CNT volume fractions to high temperature vulcanizing (HTV) silicone rubber by melt-blending method. The developed model reveals that the high fraction of thinner and longer CNT, thicker interphase, higher concentration of percolated CNT, lower waviness of CNT, and higher conductivity of CNT can make a higher effective conductivity for SMCNT.

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“…Moreover, room temperature vulcanized (RTV) silicone rubber coatings filled with conductive nanoparticles prevent ice accumulation on outdoor insulators. [7][8][9][10] In Ref. 7, authors produced a dielectric coating on a glass surface by the addition of different concentrations of ZnO nanoparticles to RTV silicone rubber.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. 8, semiconductive silicone rubber was painted on the bottom of suspension disc insulators, while the upper ceramic surface was untreated. The electrical properties of the insulator with this coating under freezing rain conditions was comparable with that of a clean insulator.…”

Section: Introductionmentioning

confidence: 99%

Effect of fabrication method on the physical properties of carbon-nanotube/silicone-rubber nanocomposite in high-voltage insulators

Mohammadnabi

Rahmani

2023

Journal of Composite Materials

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Effects of fog condensation and fine dust on the high-voltage insulator surface are harmful. The insulator housing material (silicone rubber) must be changed in order to allow a controlled leakage current to flow on the surface and causes Joule heating effect. Accordingly, surface temperature of the insulator is increased and fog condensation on the insulator surface is prevented. For this purpose, silicone rubber - multiwalled carbon nanotubes (MWCNT) nanocomposites (SRCNT) were prepared using two different processes: a solution-blending (SB) method and a dry-state of melt-blending (MB) method. Field Emission Scanning Electron Microscopy (FESEM) images indicated that the MWCNT dispersion in silicone rubber matrix of SRCNT samples produced by SB method is much better than that of MB method. Fourier Transform Infrared (FTIR) spectroscopy determined the possibility of a greater reduction in hydrophobicity properties in the sample prepared by the SB method compared to the sample made by the MB method, and the contact angle measurements confirmed this expectation. Furthermore, in a same MWCNT concentration, the electrical conductivity of SRCNT samples prepared by SB method are greater than those produced by MB method. Results showed that MB is a high efficient method for producing the SRCNT in a large amount.

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Study of anti-icing performance of insulator strings bottom-coated with semiconductive silicone rubber coating

Cited by 31 publications

References 24 publications

Anti-Icing Mechanism for a Novel Slippery Aluminum Stranded Conductor

Anti-Icing Mechanism for a Novel Slippery Aluminum Stranded Conductor

Electrical Conductivity Modeling and Fabrication of Carbon Nanotubes/Silicone Rubber Composites for High Voltage Insulators in Regions With a Polluted Atmosphere

Effect of fabrication method on the physical properties of carbon-nanotube/silicone-rubber nanocomposite in high-voltage insulators

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