Gotowe bibliografie tematyczne / High Voltage Ceramic insulators

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Gotowa bibliografia na temat „High Voltage Ceramic insulators”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "High Voltage Ceramic insulators"

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Frącz, Paweł, Ireneusz Urbaniec, Tomasz Turba i Sławomir Krzewiński. "Diagnosis of High Voltage Insulators Made of Ceramic Using Spectrophotometry". Journal of Spectroscopy 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/9548302.

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The paper presents results of comparative analysis of optical signals emitted by partial discharges occurring on three types of high voltage insulators made of porcelain. The research work consisted of diagnosis of the following devices: a long rod insulator, a cap insulator, and an insulating cylinder. For optical signal registration a spectrophotometer was applied. All measurements were performed under laboratory conditions by changing the value of partial discharges generation voltage. For the cylindrical insulator also the distance between high voltage and ground electrodes was subjected for investigation as a factor having influence on partial discharges. The main contribution which resulted from the studies is statement that application of spectrophotometer enables faster recognition of partial discharges, as compared to standard methods.
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Liu, Yong, i Xingwang Huang. "Effects of Flash Sintering Parameters on Performance of Ceramic Insulator". Energies 14, nr 4 (22.02.2021): 1157. http://dx.doi.org/10.3390/en14041157.

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Ceramic outdoor insulators play an important role in electrical insulation and mechanical support because of good chemical and thermal stability, which have been widely used in power systems. However, the brittleness and surface discharge of ceramic material greatly limit the application of ceramic insulators. From the perspective of sintering technology, flash sintering technology is used to improve the performance of ceramic insulators. In this paper, the simulation model of producing the ceramic insulator by the flash sintering technology was set up. Material Studio was used to study the influence of electric field intensity and temperature on the alumina unit cell. COMSOL was used to study the influence of electric field intensity and current density on sintering speed, density and grain size. Obtained results showed that under high temperature and high voltage, the volume of the unit cell becomes smaller and the atoms are arranged more closely. The increase of current density can result in higher ceramic density and larger grain size. With the electric field intensity increasing, incubation time shows a decreasing tendency and energy consumption is reduced. Ceramic insulators with a higher uniform structure and a smaller grain size can show better dielectric performance and higher flashover voltage.
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Palhade, R. D., V. B. Tungikar, G. M. Dhole i S. M. Kherde. "Coupled Field Thermoelectric Simulation of High Voltage Ceramic Cap and Pin Disc Type Insulator Assembly". International Journal of Manufacturing, Materials, and Mechanical Engineering 4, nr 1 (styczeń 2014): 69–86. http://dx.doi.org/10.4018/ijmmme.2014010105.

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Transmission of high power at high voltages over very long distances has become very imperative. At present, throughout the globe, this task performed by overhead transmission lines. The dual task of mechanically supporting and electrically isolating the live phase conductors from the support tower is performed by insulators. The electrical potential, field and temperature distribution along the insulators governs the possible effects, which is quite detrimental to the system. However, a reliable data on electrical potential, field and temperature distribution in commonly employed insulators are rather scarce or access individually for thermal or electrical load only. Considering this, the present work has made an attempt to study accurately, thermal and electrical characteristics of 11 kV single cap and pin type ceramic disc distribution insulator assembly used for high voltage transmission. The coupled field thermo electrical finite element by using commercially available FEM software Ansys-11 is employed for the required field computations. This new set of ANSYS coupled-field elements enables users to accurately and efficiently analyze thermoelectric devices. This paper review the finite element formulation, which in addition to Joule heating, includes Seebeck, Peltier, Thomson effects and electrical load, i. e. by considering thermal and electric loads acting simultaneously. The Electrical voltage, electrical field and temperature distribution is deduced and compared with various other/individual analyses.
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Akbar, Mohammad, i Basharat Mehmood. "Global experience of HVDC composite insulators in outdoor and indoor environment". REVIEWS ON ADVANCED MATERIALS SCIENCE 59, nr 1 (17.12.2020): 606–18. http://dx.doi.org/10.1515/rams-2020-0050.

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AbstractHigh-voltage direct current (HVDC) transmission is known as green-energy transfer technology and has recently become an attractive alternative of high-voltage alternating current (HVAC) due to its high-power transmission capability and lower power loss. Use of composite insulators on direct current (DC) transmission lines experienced rapid growth in recent years due to their high hydrophobicity and better performance in contaminated environment than conventional ceramic insulators. During their service operation on DC lines, insulators are prone to more accumulation of contaminants due to unidirectional electric field. The contaminants under wet conditions allow leakage current to flow on the insulator surface. Being organic in nature, polymeric insulators have a tendency to age under the combined effects of electrical and environmental stresses. To fully understand the long-term aging performance of DC composite insulators, a detailed survey was considered necessary. Towards that end, this paper critically summarizes worldwide experience of aging performance of composite insulators in the field as well as in laboratory conditions.
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Rosli, Hanan, Nordiana Azlin Othman, Nor Akmal Mohd Jamail i Muhammad Nafis Ismail. "Effects of external shed damage on voltage and electric field profile for overhead insulators". World Journal of Engineering 16, nr 4 (8.08.2019): 468–76. http://dx.doi.org/10.1108/wje-03-2018-0112.

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Purpose This paper aims to present simulation studies on voltage and electric field characteristics for imperfect ceramic insulators using QuickFieldTM software. Based on previous studies, it is accepted that string insulator can still serve the transmission line although imperfect of certain insulator exist in a string. However, different materials of porcelain and glass type had made these insulators own different abilities to carry electricity to be transferred to the consumers. Design/methodology/approach Cap and pin type of porcelain and glass insulators are used as the main subject for comparison. The simulation works begins with modeling a single insulator, followed by string of ten insulators with their respective applied voltage, that is, 11 and 132 kV. The insulator was modeled in alternate current conduction analysis problem type using QuickField Professional Software. Technical parameters for porcelain and glass insulator were manually inserted in the modeling. Findings This paper presents an investigation on the influence of broken porcelain and glass insulators in string for voltage and electric field characteristics. For single insulator, the voltage distribution may literally reduce when experiencing external damages; whereby the broken porcelain insulator condition is worse than the glass insulator. In terms of electric field distribution, the glass insulator is badly affected compared with the porcelain insulator, as it is pulverized comprehensively. Research limitations/implications Further work needs to be done to establish whether the experiments of these simulations study will present coequal outcomes. This study endeavors in promoting a good example of voltage and electric field characteristics across high voltage (HV) insulator with the presence of broken insulator in the string. Practical implications This study is beneficial to future researchers and manufacturing companies in strategic management and research planning when they involve in the field of HV insulators. It will also serve as a future reference for academic and study purposes. This research will also educate many people on how HV insulators work. Social implications This study will be helpful to the industry and business practitioners in training for the additional results and knowledge to be updated in the area of HV insulators. Originality/value This paper presents the analysis of porcelain and glass insulators according to their respective logic conditions when broken. Consequently, the existence of a damage insulator in a string may alter the distribution of voltage and electric field which may ultimately lead to the insulation breakdown after some time. This is because the broken insulator may cause other insulators to withstand the remaining voltage allocated for that particular insulator and may affect the insulators in terms of the life span. Therefore, the distribution of voltage and electrical field characteristics in the presence of broken insulators had been studied in this project.
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Tudose, I. V., M. Suchea, K. Siderakis, E. Thalassinakis i E. Koudoumas. "Comparative study on field collected samples of aged silicon rubber composite coatings for high voltage insulators". Acta Chemica Iasi 21, nr 2 (1.12.2013): 93–106. http://dx.doi.org/10.2478/achi-2013-0009.

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Abstract : Pollution of high voltage (HV) insulators is a phenomenon with a considerable impact to the performance of transmission and distribution electrical networks. The use of composite materials and especially Silicone Rubber proved to be an efficient improvement, capable of suppressing the problem and diminishing the flashover probability. As a result ceramic insulators in transmission lines are replaced by insulators with composite housing, either HTV Silicone Rubber or LSR. In the case of HV substations however, the replacement of insulators is rather difficult, due to the complexity of the equipment and the corresponding financial cost. In this case the application of RTV Silicone Rubber is an equivalent alternative. The ceramic insulators are covered with a 0.5 mm RTV SIR coating which provides the advantages of composite insulators on a ceramic substrate. After installation the possible material lifetime, which is determined by the service conditions and the material formulation, is of primary concern. In Crete, a large scale application exists and coatings that exceed a service period of 10 years are still in operation. The present study focuses on the structural and morphological characterization of field collected composite insulators of various ages so that the degradation degree can be correlated with their service.
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Eleperuma, K., T. P. Saha i T. Gillespie. "Electric field modelling of non–Ceramic high voltage insulators". Australian Journal of Electrical and Electronics Engineering 4, nr 3 (styczeń 2008): 239–48. http://dx.doi.org/10.1080/1448837x.2008.11464190.

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Hawal, Abdallah O., Suliman A. Ben Rahma i Moayed M. Abdul Samed. "Electrical Performance Study of 11kV Coated Porcelain, Coated Glass, and Polymer Outdoor High Voltage Insulators". مجلة الجامعة الأسمرية: العلوم التطبيقية 8, nr 2 (5.06.2023): 31–45. http://dx.doi.org/10.59743/jauas.8.2.1.

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The study in this paper investigates how contaminations and different types of pollutants affect the electrical performance of outdoor coated porcelain, coated glass, and composite insulators when subjected to an 11 kV AC voltage. The ceramic insulators (porcelain and glass) coating layer is assumed to be RTV silicon rubber material with a 0.5 mm thickness. The effect of these three pollution cases on the electrical performance were investigated using a commercial software called COMSOL Multiphysics based on the finite element method (FEM). The three pollution cases were uniform, non-uniform pollution, and water droplets. In the uniform pollution condition, the pollution layer over the surface of the insulators was assumed to be 0.5 mm; however, in non-uniform pollution condition, water patches with a thickness varying from 0.5 to 1.5 mm was used. In water droplets condition, hemispherical shapes were used to model water droplets with a diameter of 1 mm. Voltage, electrical field distributions, and dissipated power were computed along the creepage distance of the three insulators models. The simulation results indicated that for the uniform case, the lowest electrical field appeared on the silicon rubber insulator. For the non-uniform case, the electrical field distribution became more non-uniform for the three models. In the water droplets case, more fluctuations appeared in the metal end fittings where the water droplets were located. The analysis indicated that the maximum dissipated power was found to be for the coated glass. The obtained results showed that the silicon rubber insulator offered better performance compared with coated porcelain and glass. Coated porcelain offered better performance compared with the coated glass insulator.
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Muangpratoom, Pichai, Issaraporn Khonchaiyaphum i Wanwilai Vittayakorn. "Improvement of the Electrical Performance of Outdoor Porcelain Insulators by Utilization of a Novel Nano-TiO2 Coating for Application in Railway Electrification Systems". Energies 16, nr 1 (3.01.2023): 561. http://dx.doi.org/10.3390/en16010561.

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The present study aimed to develop the electrical performance of outdoor insulators using a nano-TiO2 coating for railway electrification systems. The prototype design of porcelain insulators with normal coatings and using a nano-TiO2 coating is based on IEC 60815-1. The first test was performed to measure the low-frequency flashover AC voltage under both dry and wet conditions. In addition, the other test was conducted to measure the lightning impulse critical-flashover voltage at positive and negative polarity under dry-normal and wet-contaminated conditions. X-ray diffraction (X-RD) and Scanning electron microscopy (SEM) were used to examine the micro surface and show that the nano-TiO2 coating was adhered to the surface of the outdoor porcelain insulator and exists in an amorphous state. Additionally, it was observed and discovered that scattered nano-TiO2 strengthens the glassy matrix and creates a sturdy barrier that causes flashover voltage to be reduced under conditions of high dielectric strength. Nanostructured ceramic formulations outperform ordinary porcelain in terms of breakdown voltage strength, particularly for the insulators’ low-frequency flashover performances under dry and wet test conditions. However, a significant change in the lightning impulse critical-flashover voltage characteristics is observed and is not much better when adding the nano-TiO2 coating to the porcelain insulators.
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Roula, A., K. Boudeghdegh i N. Boufafa. "Improving usual and dielectric properties of ceramic high voltage insulators". Cerâmica 55, nr 334 (czerwiec 2009): 206–8. http://dx.doi.org/10.1590/s0366-69132009000200014.

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The optimization of the formulation (nature and content of chemical components) and the technical parameters of the shaping-up process of ceramic insulators (in replacement of those in glass) are the objectives of this study. The decontamination of SiO2 (solid-liquid extraction of Fe xOy) and the increase of both BaO and ZrO2 amounts (while Na2O is partially eliminated) and the firing temperature allowed a significant increase of all the phys-mechanical and insulating properties at the commercial frequency 50-60 Hz. Samples with 15 mm diameter and 2 mm thickness and others for mechanical properties were needed. The characterization concerned Ba-Zr(Al xSi1-x)O3 ceramic samples. By data computing of the test results, a new "computed" formulation (Ba-stabilized and Zr doped mullite) showed excellent phys-mechanical (density, viscosity, flexural and traction strengths) and insulating properties (transversal resistivity, dielectric strength).
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Rozprawy doktorskie na temat "High Voltage Ceramic insulators"

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Que, Weiguo. "Electric Field and Voltage Distributions along Non-ceramic Insulators". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1037387155.

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Blackmore, Paul David. "Degradation of polymeric outdoor high voltage insulation : surface discharge phenomena and condition assessment techniques". Thesis, Queensland University of Technology, 1997.

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Braini, Shuaib. "Coatings for outdoor high voltage insulators". Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/59071/.

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As the range of transmission voltage increases, the pollution severity of the site becomes the most important factor in determining the insulation level of the system. Flashover on polluted insulators poses a serious threat to the reliability of the system and leads to system outages. There are many remedial measures to minimize the flashover of a porcelain insulator under pollution conditions. One such method is the application of hydrophobic coatings such as Room Temperature Vulcanizing Silicone Rubber (RTV- SiR) and Grease coatings on the surface of ceramic insulators. A recently proposed solution for contaminated outdoor insulators consists of the application of the Nanocoating “Voltshield” onto the surface of the insulator. This thesis reports a comparative assessment of the performance of these coating systems. Laboratory testing of coated porcelain insulators has been undertaken based on the solid layer method of IEC 60507 (artificial pollution- clean fog testing) and IEC 60587 (the inclined plane tests and constant voltage-liquid contaminants) to evaluate the coatings’ resistance against tracking and erosion. The performance of these coatings was assessed by monitoring the leakage current on the insulator surfaces. The applied voltage and the leakage current signals were acquired throughout the tests and saved for further analysis. The effect of UV radiation on the coatings has also been investigated. In addition, hydrophobicity tests were performed on the coated insulators. It was found that the Nanocoating reduces the leakage current by 90% whilst the energy absorbed on the insulator surface is reduced by 98% when compared to an uncoated insulator. The Nanocoating showed good resilience to sand blasting, but under long exposure to sand blasting, the surface began to degrade and showed pockmarks. The Nanocoated insulator showed good stability under UV exposure in terms of leakage current suppression. However, Nanocoated insulator lost its hydrophobicity on exposure to fog, and has lower flashover voltage than the uncoated insulator by 12.5%. Similar observations were made for the RTV coatings, where the current magnitude reduced by 92%, the energy absorbed on the insulator surface is reduced by 99% when compared to uncoated insulator and the flashover voltage is increased by 50%. RTV coating materials showed good resistance against tracking and erosion even after UV exposure. The electric field and voltage distribution along the leakage surface of coated and uncoated ceramic insulators under clean and polluted conditions were studied using finite element analysis COMSOL Multiphysics®. The electric field peaked at both the HV electrode and the ground electrode, and the presence of pollution in the form of water droplets on the coated insulator increased the electric field at the HV electrode. This study shows that the application of protective coatings to HV outdoor insulators significantly improves their performance. A reduction in surface current and power dissipation is observed, and a reduction in surface heating results in less dry-band arcing. A reduction in dissipated energy can make a contribution to reducing the total loss on the power system. In addition it showed the ability of coatings to resist tracking and erosion which leads to longer coating life under severe weather conditions. The coatings also increased the flashover voltage of the insulators which leads to more stable power system.
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Benwell, Andrew L. "Flashover prevention on polystyrene high voltage insulators in a vacuum". Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5018.

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Thesis (M.S.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on March 18, 2008) Includes bibliographical references.
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Ramos, Toriq. "Ultrasonic cleaning line walker for high voltage power line insulators". Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/3069.

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Thesis (MEng (Electrical Engineering))--Cape Peninsula University of Technology, 2018
This study investigates the feasibility to clean the insulators on live high voltage power lines autonomously, using ultrasound. Faulty and contaminated insulators on high voltage power lines cause flashovers, which contribute to load shedding and expensive repairs. Turning off the power in order to perform maintenance or clean insulators is a concern as it disrupts nearby businesses and homes. Regular maintenance of equipment on High voltage transmission lines (HVTL) is required to avoid major faults, thus saving money, and minimizing the pressure on the grid. Advancements in the field of robotics have catered for a solution to this concern. The study is divided into two sections; cleaning insulators using ultrasound and a line walker to navigate the high voltage transmission lines. The cleaning station was developed using a peculiar ultrasonic delivery method. The transducer is suspended 2 mm above the insulator and water is pumped into the gap between the two surfaces. The ultrasound is then applied to a small volume of water trapped by the face of the transducer using the phenomenon known as water surface tension or skin effect. A 12 V generator controlled by a Pulse Width Modulation (PWM) circuit delivers over 300 V peak to peak to the transducer via a push pull transformer. The station is equipped with a 28 kHz piezoelectric transducer governed by an admittance locking routine. The generator tracks the resonant frequency of the transducer to ensure maximum power is utilised for cleaning the contaminated area.. This peculiar delivery technique effectively cleans insulators contaminated with grease, boasts short cleaning times, and only requires a small quantity of water. A four wheeled line walker was then designed in order to transport the cleaning station to the contaminated insulators. Each wheel propels the line walker forward at 0.1 m/s, and a uniquely shaped leg mechanism couples them to the chassis. The four legs are capable of independently removing the wheels from the line to avoid obstacles, and a 16-bit Atmega 2560 microcontroller monitors and controls all on-board devices and moving parts. Limit switches, an accelerometer and an ultrasonic distance sensor allow the robot to navigate around obstacles such as strain clamps, vibration dampers and indicating spheres. The line walker is capable of maintaining a balanced horizontal position while navigating the line. A scaled prototype of the line walking robot was manufactured and tested in a laboratory environment. The results prove that the robot can effectively navigate around obstacles while the system is run completely autonomously. The study provides proof of concept and enough evidence to suggest that the ultrasonic cleaning line walker is a feasible project with great potential.
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Hinde, David Derek. "Corona discharges on the surfaces of high voltage composite insulators". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/29320/2/David_Hinde_Thesis.pdf.

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The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.
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Hinde, David Derek. "Corona discharges on the surfaces of high voltage composite insulators". Queensland University of Technology, 2009. http://eprints.qut.edu.au/29320/.

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The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.
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Goss, Ben. "Degradation and life time prediction of high voltage insulation materials". Thesis, Queensland University of Technology, 2001.

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Elbuzedi, Mohamed. "Material study and properties of polymers used in composite high voltage insulators". Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/17749.

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Thesis (MSc)--University of Stellenbosch, 2007.
ENGLISH ABSTRACT: Silicone rubber, particularly poly(dimethylsiloxane) (PDMS), has been increasingly used in the manufacture of outdoor high voltage insulators in the recent years. PDMS offers several advantages that make it suitable for outdoor use, such as low weight, a hydrophobic surface, stability, and excellent performance in heavily polluted environments. PDMS surfaces can, however, become progressively hydrophilic due to surface oxidation caused by corona discharge, UV radiation and acid rain. In this study, PDMS samples of controlled formulations as well as six commercial insulator materials four PDMS based and two ethylene propylene diene monomer (EPDM) based were exposed to various accelerated weathering conditions for various periods of time in order to track changes in the material over time. The ageing regimes developed and used to simulate the potential surface degradation that may occur during in-service usage included needle corona and French corona ageing, thermal ageing, UV-B irradiation (up to 8000 hours) and acid rain (up to 200 days). Both the chemical and physical changes in the materials were monitored using a wide range of analytical techniques, including: static contact angle measurements (SCA), optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), gas chromatography (GC), gas chromatography/mass spectroscopy (GC/MS), size-exclusion chromatography (SEC), Fourier-transform infrared photoacoustic spectroscopy (FTIR-PAS) and slow positron beam techniques (PAS). A low molecular weight (LMW) uncrosslinked PDMS model compound was used to further study the chemical effects of corona exposure on PDMS materials. PDMS showed far better performance than EPDM, in terms of resistance to the various ageing regimes and “hydrophobicity recovery”.
AFRIKAANSE OPSOMMING: Silikoonrubber, spesifiek polidimetielsiloksaan (PDMS), is gedurende die afgelope paar jaar toenemend gebruik in die vervaardiging van buitelughoogspanningisolators. PDMS het baie voordele vir gebruik in elektriese isolators soos ‘n laer massa, ʼn hidrofobiese oppervlak, stabiliteit en uitstekende werking in hoogsbesoedelde omgewings. Die hidrofobiese oppervlakte kan egter gelydelik hidrofilies word weens oppervlakoksidasie as gevolg van korona-ontlading, UV-bestraling en suurreën. In hierdie studie is PDMS monsters van verskillende samestellings sowel as ses kommersiële isolators (vier PDMS en twee etileenpropileenrubber (EPDM)) blootgestel aan verskillende versnelde weersomstandighede vir verskillende periodes om die veranderinge in die materiale te monitor. Die verskillende materiale is gerangskik volgens hulle werking oor ‘n periode van tyd. Dit het ook ‘n geleentheid gebied om die eienskappe van die verskillende samestellings te bestudeer. Die tegnieke wat ontwikkel is om die moontlike oppervlakdegradasie te simuleer, het naald-korona, “French” korona, UVB-bestraling (tot 8000 uur) en suurreën (tot 200 dae) ingesluit. Beide die chemiese en die fisiese veranderinge in die materiale is gemonitor met behulp van verskeie tegnieke soos statiese kontakhoekbepaling, optiese mikroskopie, skandeerelektronmikroskopie, energieverspreidingsspektroskopie, gaschromatografie, grootte-uitsluitingschromatografie, foto-akoestiese Fouriertransforminfrarooi (PASFTIR) en stadige-positronspektroskopie (PAS). ʼn Lae molekulêre massa PDMS modelverbinding is gebruik om die chemiese effek van korona te bestudeer. Die PDMS materiale het baie beter vertoon teenoor die EPDM materiale in terme van hulle herstel van hidrofobisiteit.
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Atari, Jabarzadeh Sevil. "Prevention of Biofilm Formation on Silicone Rubber Materials for Outdoor High Voltage Insulators". Doctoral thesis, KTH, Polymera material, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174091.

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Microbial colonization on the surface of silicone rubber high voltage outdoor insulators often results in the formation of highly hydrated biofilm that influence the surface properties, such as surface hydrophobicity. The loss of hydrophobicity might lead to dry band formation, and, in the worst cases, flashover and failure of the insulator. In this work, the biocidal effects of various antimicrobial compounds in silicone rubber materials were determined. These materials were evaluated according to an ISO standard for the antimicrobial activity against the growth of aggressive fungal strains, and microorganisms that have been found colonizing the surfaces of outdoor insulators in several areas in the world. Several compounds suppressed microbial growth on the surfaces of the materials without compromising the material properties of the silicone rubber. A commercial biocide and thymol were very effective against fungal growth, and sodium benzoate could suppress the fungal growth to some extent. Thymol could also inhibit algal growth. However, methods for preservation of the antimicrobial agents in the bulk of the material need to be further developed to prevent the loss of the compounds during manufacturing. Biofilm formation affected the surface hydrophobicity and complete removal of the biofilm was not achieved through cleaning. Surface analysis confirmed that traces of microorganisms were still present after cleaning. Further, surface modification of the silicone rubber was carried out to study how the texture and roughness of the surface affect biofilm formation. Silicone rubber surfaces with regular geometrical patterns were evaluated to determine the influence of the surface texture on the extent of microbial growth in comparison with plane silicone rubber surfaces. Silicone rubber nanocomposite surfaces, prepared using a spray-deposition method that applied hydrophilic and hydrophobic nanoparticles to obtain hierarchical structures, were studied to determine the effects of the surface roughness and improved hydrophobicity on the microbial attachment. Microenvironment chambers were used for the determination of microbial growth on different modified surfaces under conditions that mimic those of the insulators in their outdoor environments. Different parts of the insulators were represented by placing the samples vertically and inclined. The microbial growth on the surfaces of the textured samples was evenly distributed throughout the surfaces because of the uniform distribution of the water between the gaps of the regular structures on the surfaces. Microbial growth was not observed on the inclined and vertical nanocomposite surfaces due to the higher surface roughness and improved surface hydrophobicity, whereas non-coated samples were colonized by microorganisms.

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Książki na temat "High Voltage Ceramic insulators"

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Canadian Society of Civil Engineers., red. High voltage insulator manufacture. [Montréal?: s.n., 1991.

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S, Zaengl W., i Kuffel J, red. High voltage engineering: Fundamentals. Wyd. 2. Oxford: Butterworth-Heinemann, 2000.

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Kreuger, F. H. Partial discharge detection in high-voltage equipment. London: Butterworths, 1989.

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Kind, Dieter. High-voltage insulation technology: Textbook for electrical engineers. Braunschweig: Vieweg, 1985.

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Arora, Ravindra. High voltage and electrical insulation engineering. Piscataway, NJ: IEEE Press, 2011.

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International Symposium on High Voltage Engineering (13th 2003 Delft, Netherlands). High voltage engineering: Proceedings of the XIIIth International Symposium on High Voltage Engineering : Delft, Netherlands, 25-29th August, 2003. Rotterdam: Millpress, 2003.

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Qi, Su, Knovel (Firm) i Institution of Engineering and Technology, red. Condition assessment of high voltage insulation in power system equipment. London: Institution of Engineering and Technology, 2008.

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Mazen, Abdel-Salam, red. High-voltage engineering: Theory and practice. Wyd. 2. New York: M. Dekker, 2000.

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Florkowski, Marek. Partial discharge image recognition using neural network for high voltage insulation systems. Kraków: Wydawnictwa AGH, 1996.

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Blanco, Porfirio Velazquez. High voltage alternating current performance of insulators under several types and distributions of contaminants. Salford: University of Salford, 1990.

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Części książek na temat "High Voltage Ceramic insulators"

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Walker, William J. "Alumina Insulators for High Voltage Automotive Ignition Systems". W Processing, Properties, and Design of Advanced Ceramics and Composites: Ceramic Transactions, 359–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119323303.ch32.

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Prette, André L. G., Vincenzo M. Sglavo, Orestes E. Alarcon i Marcio C. Fredel. "Application of Semiconductor Ceramic Glazes to High-Voltage Ceramic Insulators". W Advanced Ceramic Coatings and Interfaces IV, 33–37. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584293.ch4.

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Owen, Michael J. "Surface Properties of Silicone High Voltage Insulators". W Science and Technology of Polymers and Advanced Materials, 99–106. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-0112-5_9.

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Vedral, Josef. "Diagnostics of Insulators, Surge Arresters, and Circuit Breakers". W Non-destructive Diagnostic of High Voltage Electrical Systems, 279–94. New York: River Publishers, 2023. http://dx.doi.org/10.1201/9781003394198-12.

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Grigoryev, Evgeny G., i Eugene A. Olevsky. "Multiscale Thermal Processes in High Voltage Consolidation of Powders". W Ceramic Transactions Series, 189–95. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118744109.ch21.

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Kim, Hyungsuk K. D. "Development of High Voltage Multilayer Ceramic Capacitor". W Advances in Powder and Ceramic Materials Science 2023, 11–15. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-22622-9_2.

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George, Graeme A., Gregory A. Cash, Heping Liu, Ben G. S. Goss, David Birtwhistle i Andrej Krivda. "Field Monitoring of the Ageing of Composite High Voltage Insulators". W Ageing Studies and Lifetime Extension of Materials, 225–37. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1215-8_25.

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Ranachowski, J., Z. Librant i F. Rejmund. "Microstructure and Subcritical Crack Growth in Long-Rod High-Voltage Insulators". W Brittle Matrix Composites 1, 205–13. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4319-3_13.

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Lombardo, Stephen J., i Daniel S. Krueger. "The Processing and Electrical Properties of Sr(Tix Zr1-x )O3 Compositions for High Voltage Applications". W Ceramic Transactions Series, 397–404. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118408186.ch37.

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Seidel, M., K. Nikolowski, M. Wolter, I. Kinski i A. Michaelis. "The Influence of the Synthesis Route on Electrochemical Properties of Spinel Type High-Voltage Cathode Material LiNi0.5Mn1.5O4for Lithium Ion Batteries". W Ceramic Transactions Series, 197–203. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119234531.ch18.

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Streszczenia konferencji na temat "High Voltage Ceramic insulators"

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Sorqvist, T. "Field experience with non-ceramic hollow-core insulators". W 11th International Symposium on High-Voltage Engineering (ISH 99). IEE, 1999. http://dx.doi.org/10.1049/cp:19990788.

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Phillips, A. J. "Ultrasonic emissions from non-ceramic insulators with defects". W 11th International Symposium on High-Voltage Engineering (ISH 99). IEE, 1999. http://dx.doi.org/10.1049/cp:19990810.

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Gopal, H. G. "Determination of scintillation inception gradient for contaminated ceramic insulators". W 11th International Symposium on High-Voltage Engineering (ISH 99). IEE, 1999. http://dx.doi.org/10.1049/cp:19990837.

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Marimuthu, K., S. Vynatheya, N. Vasudev i P. Raja. "Quality Analysis of Ceramic Insulators Under Electro Thermal Stresses". W 2019 International Conference on High Voltage Engineering and Technology (ICHVET). IEEE, 2019. http://dx.doi.org/10.1109/ichvet.2019.8724303.

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Subba Reddy, B., N. A. Sultan, P. M. Monika, B. Pooja, O. Salma i K. V. Ravishankar. "Simulation of potential and electric field for high voltage ceramic disc insulators". W 2010 5th International Conference on Industrial and Information Systems (ICIIS). IEEE, 2010. http://dx.doi.org/10.1109/iciinfs.2010.5578647.

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Hernandez-Garcia, C., G. Palacios-Serrano, P. Adderley, D. Bullard, J. Grames, M. A. Mamun, M. Poelker i in. "Inverted Geometry Ceramic Insulators in High Voltage DC Electron Guns for Accelerators". W 2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2021. http://dx.doi.org/10.1109/ceidp50766.2021.9705333.

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Zhang, Hu, Lei Yang, Wenhua Wu, Sida Xu, Rui Zhang i Yuqing Wang. "Experimental Study on Electromechanical Characteristics of Cap and Pin Ceramic or Glass Insulators with Composite Shed". W 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961397.

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Fauziah, Dini, Heldi Alfiadi, Rachmawati i Suwarno. "Performances of long-term coastal field aged silicone-coated ceramic insulators under clean and salt fog conditions". W 2017 International Conference on High-Voltage Engineering and Power Systems (ICHVEPS). IEEE, 2017. http://dx.doi.org/10.1109/ichveps.2017.8225866.

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Stein, Norbert, i Amir M. Miri. "High-voltage ceramic station post insulators least-effort determination of bending strength under Short-Circuit". W 2010 12th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2010. http://dx.doi.org/10.1109/optim.2010.5510334.

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Stadlbauer, T., L. Ducimetiere, T. Kramer, V. Namora i J. J. Riveiro Herrero. "Ceramic Insulator Qualification for Ultra-High Vacuum Fast Pulsed Accelerator Magnets". W 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961831.

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Raporty organizacyjne na temat "High Voltage Ceramic insulators"

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Javedani, J., D. Goerz, T. Houck, E. Lauer, R. Speer, L. Tully, G. Vogtlin i A. White. Understanding and Improving High Voltage Vacuum Insulators for Microsecond Pulses. Office of Scientific and Technical Information (OSTI), marzec 2007. http://dx.doi.org/10.2172/902244.

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Luo, Jian. High-Entropy Ceramic Coatings: Transformative New Materials for Environmentally-Compatible Thin-Film Insulators against High-T Molten Salts. Office of Scientific and Technical Information (OSTI), listopad 2022. http://dx.doi.org/10.2172/1897087.

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