Coatings
·
2023
·Vol. 13
·期 10
·1792
·
IF 3.4
Lei Fan,Mingyong Xia,Jian Liu,Bo Li,Tao Zhu,Yingying Zhao,Linbo Song,Yuan Yuan
Ice accumulation on glass insulators is likely to cause faults such as flashover, tripping and power failure, which interfere with the normal operation of the power grid. Accordingly, superhydrophobic coatings with great anti-icing potential have received much attention. In this study, three superhydrophobic coatings (PTFE, Al2O3and SiO2) were successfully prepared on glass surfaces by using one-step spraying. The microscopic morphology, wettability, anti-icing and anti-glaze icing properties of the superhydrophobic coatings were comparatively analyzed. The results indicated that the PTFE coating had a densely distributed rough structure, showing a contact angle of 165.5° and a sliding angle of 3.1°. The water droplets on the surface could rebound five times. Compared with the Al2O3and SiO2coatings, the anti-icing performance of the PTFE coating was significantly improved. The freezing time was far more than 16 times that of glass (4898.7 s), and the ice adhesion strength was 9 times lower than that of glass (27.5 kPa). The glaze icing test in the artificial climate chamber showed that the icing weight of the PTFE coating was 1.38 g, which was about 32% lower than that of the glass. In addition, the icing/melting and abrasion cycles destroyed the low-surface-energy substances and nanostructures on the surface, leading to the degradation of the anti-icing durability of the PTFE coatings. However, the PTFE coating still maintained excellent hydrophobicity and anti-icing properties after UV irradiation for up to 624 h. The superhydrophobic coatings prepared in this work have promising development prospects and offer experimental guidance for the application of anti-icing coatings on glass insulators.Keywords:superhydrophobic coating;glass insulator;spraying;anti-icing
研究领域:
材料科学
·
电力工程
✓ 已验证
产品关联
DOI
高影响因子
Virtual and Physical Prototyping
·
2023
·
IF 10.6
Lipeng Zhong,Junxian Du,Yingwei Xi,Feng Wang,Linmei Wu,Jinyu Li,Min Tu,Xiaopeng Li,Guanghai Fei
Graded permittivity materials have gained significant attention due to their exceptional ability to regulate electric fields. Multi-material stereolithography (SLA) 3D printing has opened up new possibilities for creating such materials. However, conventional SLA printers typically generate graded material using fixed printing parameters and multiple feedstocks with limited differences, resulting in a constrained capacity for modulating the electric field distribution. To address this limitation, we have developed a multi-material, parameter-controllable SLA strategy, enabling us to assign varying printing parameters for each building layer and switch between feedstocks with significant differences. Solid insulators with graded permittivity are optimised through electric field distribution simulations and subsequently manufactured using our innovative multi-material SLA approach. A 4-layered graded insulator effectively decreases the maximum electric field strength from 82.5–30.8 kV/mm. Both flashover tests and partial discharge signals confirm that graded insulators outperform homogeneous ones in electrical insulation.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·822
·
IF 3.267
Xinwei Wang,Shan Lu,Tianzheng Wang,Xinran Qin,Xilin Wang,Zhidong Jia
Surface pollution deposition in a high voltage surface can reduce the surface flashover voltage, which is considered to be a serious accident in the transmission of electric power for the high conductivity of pollution in wet weather, such as rain or fog. Accordingly, a rapid and accurate online pollution detection method is of great importance for monitoring the safe status of transmission lines. Usually, to detect the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD), the pollution should be collected when power cut off and bring back to lab, time-consuming, low accuracy and unable to meet the online detection. Laser-induced breakdown spectroscopy (LIBS) shows the highest potential for achieving online pollution detection, but its application in high voltage electrical engineering has only just begun to be examined. In this study, a LIBS method for quantitatively detecting the compositions of pollutions on the insulators was investigated, and the spectral characteristics of a natural pollution sample were examined. The energy spectra and LIBS analysis results were compared. LIBS was shown to detect pollution elements that were not detected by conventional energy spectroscopy and had an improved capacity to determine pollution composition. Furthermore, the effects of parameters, such as laser energy intensity and delay time, were investigated for artificial pollutions. Increasing the laser energy intensity and selecting a suitable delay time could enhance the precision and relative spectral intensities of the elements. Additionally, reducing the particle size and increasing the density achieved the same results.Keywords:laser-induced breakdown spectroscopy;surface pollution;high voltage insulators;quantitatively analysis
研究领域:
电气工程
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2020
·Vol. 10
·期 7
·2617
·
IF 2.474
Shan Lu,Xinwei Wang,Tianzheng Wang,Xinran Qin,Xilin Wang,Zhidong Jia
The composition of contamination deposited on transmission line insulators can affect their surface flashover voltage. Currently, there is no rapid on-line method to detect this contamination composition in power grids. In this paper, we applied laser-induced breakdown spectroscopy (LIBS) to analyze contamination on insulator surfaces. Usually, Na and Ca salts are found in contamination along with various sulfate, carbonate, and chloride compounds. As an element’s detection method, LIBS can only measure a certain element content, for example, Ca. The mixture of various compounds with the same cations can influence the LIBS signal. The influence of mixing ratios on the calibration curves and relative spectral intensity was studied via LIBS. Na2CO3, NaHCO3, CaSO4, and CaCO3samples containing different proportions of Na and Ca were prepared. The linear correlation coefficients (R2) for the Na and Ca calibration curves generated using various mixing ratios were analyzed. The results showed that the mixture ratio did not dramatically affect the linear calibration curves for mixtures containing the same cations. This finding may significantly reduce the difficulty of applying LIBS analysis for complex contamination on insulators. The laser energy density had effects on the spectral characteristics of the measured elements. The partial least-square regression (PLSR) model can improve the accuracy of Na and Ca prediction.
研究领域:
电力工程
·
光谱学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 6
·065101
·
IF 1.62
Yueju Zhao,Xiwei Xie,Jinbiao Shi,Huaping Shan,Min Liu,Jie Liu,Jianhui Wang,Boyan Jia,Yongli Zheng,Qiang Chen,Chunfeng Zhao,Jilin Teng,Wenhua Miao
Due to the long-term operation of power grid and the interference of external uneven electric field environment, silicone rubber insulators are prone to aging and scaling, and their hydrophobicity and external insulation performance are easily affected. In order to solve this problem, a kind of silicone rubber insulator outer surface cleaning and repairing agent was prepared with self-made composite solvent and silicone as the main raw materials, supplemented by catalyst, surfactant and other additives. So as to achieve the dual effect of efficient cleaning and aging repair, improve its hydrophobicity and prolong its service life. Through hardness test, hydrophobicity test, SEM test, FT-IR test, EDS test, mechanical property test and aging test characterization, and comparing the cleaning effect of different cleaning methods, it is found that the cleaning effect of cleaning repair agent is the best. In addition, it is found that the hydrophobicity of insulator has been greatly improved, from HC4 to HC1, and the mechanical properties have also been improved. This is because after using the cleaning and repairing agent, the powdered layer on the insulator surface is removed, and more hydrophobic methylene (Si–(CH3)2) and methylene (Si–(CH3)3) are attached to the insulator surface, which reduces the -OH binding force between the insulator surface and water molecules. In addition, through the observation of the surface and cross-section micro morphology, it is found that the surface roughness of the insulator is greatly reduced and the micro cracks disappear after using the cleaning and repairing agent, which highlights a certain repairing effect. Finally, the aging test also shows that the cleaning repair layer has a certain durability.The results show that the cleaning and repairing agent can effectively clean and repair the aged insulator, improve its anti- pollution flashover ability and prolong the service life of silicone rubber insulator.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Yuan Yuan,Huiying Xiang,Guoyong Liu,Ruijin Liao
Phase change materials (PCMs) have been used for energy storage within a wide range of applications. However, they are scarcely used in the field of anti-icing of glass insulators in transmission lines under glaze ice (the icing temperature is 0∼-5 °C). Herein, we prepared phase change microcapsules (MPCMs) and applied them to permanent room temperature vulcanized (PRTV) silicon rubber to prepare anti-icing coating on glass. The n -tetradecane and nucleating agent were used to obtain a requirable phase change temperature. The MPCMs in the coating released latent heat when the temperature dropped from 2.25 to -4.73 °C, which was consistent with the temperature of glaze icing. Furthermore, MPCMs roughened the coating surface and imparted superhydrophobic to the coating. Compared with PRTV coating, the prepared MPCM/PRTV coating extended the freezing time of water droplets from 1381 to 3432 s. Additionally, the MPCMs in the coating could absorb and release energy repeatedly and maintain intactness without cracking during icing/melting cycles, and the anti-icing/deicing performance of the MPCM/PRTV coating demonstrated durability. The heat storage and release of the MPCM/PRTV coating is driven by the temperature difference, thus, we define this coating as having a “temperature switch” effect. The prepared coating shows potential anti-icing applications for glass insulators under glaze ice where the temperature fluctuates within the phase transition temperature range of this coating.
研究领域:
材料科学
·
能源工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xi Zhu,Luyi Dai,Xiuhan Guan,Zhangliang Shen,Zexuan Wu,Hongtu Cheng,Jiajie Fan,Xinglei Cui,Zhi Fang
With the increasing demand for high-voltage long-distance power transmission, insulation as the first protection of power system, faces serious challenges from material degradation caused by moisture invading, surface contamination and pollution flashover. Addressing the issue requires significant effort and may cause harmful by-product emission from large-scale wet type material processing. In this work, a novel eco-friendly dry treatment method based on manual operated Air/Alkoxysilane(PMDMS)/plasma is developed to enhance weather resistance and electrical performances of contaminated insulation. Tiny amounts of harmless reaction medium are transmitted to plasma through controllable air bubbling, and it implements precise dry type processing on material surface. Plasma pulverizes pre-existing contamination and synchronously activates hydrolysis-polymerization of PMDMS to deposit Si-containing protection layer (Si-O 2 , Si-CH 3 ) on surface. It is demonstrated that the plasma treatment inhibits dirt pollution and electrical erosion of on-site 110 kV silicone rubber (SIR), and the electrical and hydrophobicity properties are both promoted. Flashover voltage increases from 4.65 to 8.71 kV, and water contact angle increases from 138.27° to 146.41°. Overall, this newly-developed dry portable plasma treatment strategy for insulation enhancement avoids environment pollution and economic losses, and provides a scalable avenue for on-site insulation recovery and service life prolonging.
研究领域:
材料科学
·
电气工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ying Zhang,Mingwei Wang,Ran Zhuo,Wenxu Tang,Chaolu Niu,Qiulin Chen,Weihong Yang,Sicheng Zhao
Epoxy resin insulation materials are prone to micro-damage such as scratches and electrical treeing, which can lead to a decline in insulation performance and threaten the safe operation of the entire system. Microcapsule-based self-healing technology is one of the most promising solutions to address the micro-damage issues of epoxy resin. However, research has shown that when the microcapsule doping concentration exceeds 3 wt%, the mechanical strength decreases significantly, while a too low doping concentration affects the healing efficiency. This paper focuses on epoxy resin used in insulator core rods and addresses the contradiction between “low microcapsule introduction” and “high healing efficiency.” This work synthesizes magnetically targeted UV-sensitive microcapsules suitable for self-healing insulator core rods. During the curing process of the epoxy resin, the microcapsules can be directionally guided by a magnetic field to distribute in areas prone to damage, thereby ensuring repair efficiency while reducing the quantity of microcapsules used. The microcapsule shells possess UV-shielding properties, ensuring the stability of the internal repair core material. When damage propagates to the capsules, the core material flows out and cures under UV light, completing the repair of the damage. Additionally, larger-scale self-healing epoxy rod specimens were fabricated, demonstrating excellent self-healing performance against mechanical scratch damage and electrical treeing damage. In comparison, composite materials without microcapsules exhibited a reduction in tensile strength and breakdown strength to 69.06% and 74.77%, respectively, after mechanical damage. Post-repair, the mechanical strength recovery rate reached 91.6%, and the breakdown strength recovery rate achieved 90.4%.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 14
·22227-22235
·
IF 4.3
Shengyao Shi,Song Xiao,Haocheng Deng,Xiangyu Tan,Shuangshuang Tian,Ju Tang,Xiaoxing Zhang,Yi Li
Harvesting energy from natural water via an evaporation-driven hydrovoltaic device (EHD) has attracted tremendous interest, and it also offers exceptional potential for application in self-powered sensing owing to its independent operation and stability. Here, we fabricated an analytical strip by vacuum filtering single-walled carbon nanotubes (SWCNTs) into cellulose paper for highly sensitive salinity detection in water solution. The role of electrode structure, water solution ions, and temperature on the EHD response was systematically investigated. Specifically, this type of analytical strip has a specific continuous load capacity and produces a consistent voltage output of ~0.55 V. Furthermore, a self-powered equivalent salt deposit density (ESDD) sensor based on EHD was adopted for insulator contamination detection in electrical equipment, demonstrating superior sensitivity, stability, and anti-interference ability. This work broadens the EHD-based self-powered sensor and provides a quick monitoring strategy for the operational state of insulators in the electrical equipment.
研究领域:
材料科学
·
能源技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Keyan Sheng,Xiaohan Dong,Haozhe Li,Zijian Zhou,Wenchao Zhou,Tian Zeng,Xinwen Liu,Zhiyan Chen,Mianzhi Xiong,Zhenyi Zhang,Kai Ning,Yanlong Gu,Jiang Huang
In-situ curing is a scalable industrial modification technique for composite insulators that can provide significant economic benefits by eliminating numerous curing steps. In this work, we developed an efficient, environmentally friendly, simple and substrate-free curing method, namely electron beam irradiation in-situ curing polydimethylsiloxane ( e -PDMS). The fabricated e- PDMS coating has excellent adhesion and is particularly impressive because of its ultrafast cure time of only 30 s. The coating has excellent thermomechanical properties with almost no thermal weight loss at 300 °C. Two common nanoparticles were individually cured on a silicone rubber surface and successfully made the surface superhydrophobic, heat-absorbing and passive cooling, respectively. The results illustrate that the e -PDMS method developed in this study can be effectively functionalized, verified its great potential for applications in the electrical industry, which can vastly facilitate the industrial application of advanced coatings.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shuming Liu,Shuqi Liu,Qian Wang,Zhou Zuo,Lan Wei,Zhong Chen,Xidong Liang
Composite insulator is an important component of outdoor insulation systems. It works in complex environments and faces a series of problems such as surface contamination, loss of hydrophobicity, and accumulation of surface charges, which may eventually lead to flashover. Aiming to solve these problems in a simple and scalable method, we propose a multifunctional nano-coating based on SiO 2 /PDMS/EP. By the combination of multiscale structure and low surface energy modification, this coating shows excellent water-repellency performance, a large contact angle greater than 160° and a small rolling angle near 0° are achieved on coated silicone rubber, which enables the surface with excellent self-cleaning performance. Benefiting from the multiscale roughness, the heat transfer is inhibited by the reduced contact area, which further slows down the icing process on coated silicone rubber. The de-icing force on coated silicone rubber is also smaller than that on pristine silicone rubber. This coating also introduces many shallow traps to the surface, which is beneficial to the fast surface charge dissipation in a short time. Besides, the high water-repelling ability can promote the droplet to roll away under the action of electrical field force, which alleviates the electrical distortion caused by the droplets. As a result, the wet flashover voltage of coated silicone rubber is 60% higher than that of pristine silicone rubber. This multifunctional coating is a facile, scalable, and effective approach to improving the comprehensive surface performance of insulators.
研究领域:
材料科学
·
电气工程
·
高电压技术
·
表面工程
·
纳米材料
·
电力系统绝缘
✓ 已验证
DOI
高影响因子
High Voltage
·
2024
·Vol. 9
·期 6
·1322-1335
·
IF 4.4
Le Li,Shuo Tan,Yunpeng Liu,Haoyi Li,Kezhi Xu,Guancheng Zhen,Xiaoxuan Yin,Tianfang Zhao,Wenhua Wu,Lei Yang
Syntactic foam materials, due to their advantages of low densities, low water absorption, and high dielectric strengths, have significant application potential in the cores of post insulators. However, because of a large number of microbubble structures within the syntactic foam, it might decrease the partial discharge inception voltage. It is necessary to investigate the partial discharge characteristics of the foam to assess the feasibility of its internal insulation application. In this study, the syntactic foam samples with four different microsphere contents (0%–2%) were prepared, and the physical structures of the materials were characterised by using Fourier transform infrared spectroscopy, scanning electron microscopy, and three-dimensional computed tomography. Subsequently, finite element simulations of the electric field were performed to analyse the influence of the microsphere content and distribution on the internal electric field of the syntactic foam. The results suggested that both the microsphere content and distribution affected the partial discharge activity. When the microsphere content was low, the doping of microspheres essentially meant that more air gap defects were present, leading to a decrease in the partial discharge performance. However, when the microsphere content was high, the microspheres were distributed in a dense and orderly manner, improving the field concentration phenomenon and hence inhibiting the partial discharge to a certain extent. In conclusion, the findings of this study provide a data reference and theoretical support for the application of syntactic foam in the cores of composite post insulators.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）