Gotowe bibliografie tematyczne / High Voltage glass insulator

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Gotowa bibliografia na temat „High Voltage glass insulator”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "High Voltage glass insulator"

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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Samuri, N. A., Nordiana Azlin binti Othman, M. A. M. Piah, N. A. M. Jamail i H. Rosli. "Comparison on space charge and voltage distribution of high voltage insulator subjected to different contamination levels". Bulletin of Electrical Engineering and Informatics 8, nr 3 (1.09.2019): 769–76. http://dx.doi.org/10.11591/eei.v8i3.1585.

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This paper presents the study of space charge distribution on high voltage (HV) insulators under different levels of contamination. Two types of HV insulators were used in this work particularly glass and porcelain insulators. A string of 4-unit glass and porcelain insulators with 33 kV of lines voltage was designed and simulated using QuickfieldTM software. Four levels of contamination layer with different thickness have been applied on the surface of insulators to observe the effect of space charge distribution. Simulation results show that different types of insulators used at transmission lines give different effects on charge and voltage distribution. It is also found that the amplitude of charge for a single porcelain insulator is much higher compared to a single glass insulator. Similarly for a string of 4-unit insulators, the voltage distribution along the creepage distance of porcelain insulators is much higher compared to glass insulators under all contamination levels.

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Suhaimi, Saiful Mohammad Iezham, Nouruddeen Bashir, Nor Asiah Muhamad, Nurun Najah Abdul Rahim, Noor Azlinda Ahmad i Mohd Nazri Abdul Rahman. "Surface Discharge Analysis of High Voltage Glass Insulators Using Ultraviolet Pulse Voltage". Energies 12, nr 2 (9.01.2019): 204. http://dx.doi.org/10.3390/en12020204.

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Surface discharges are precursors to flashover. To pre-empt the occurrence of flashover incidents, utility companies need to regularly monitor the condition of line insulators. Recent studies have shown that monitoring of UV signals emitted by surface discharges of insulators is a promising technique. In this work, the UV signals’ time and frequency components of a set of contaminated and field-aged insulator under varying contamination levels and degrees of ageing were studied. Experimental result shows that a strong correlation exists between the discharge intensity levels under varying contamination levels and degree of ageing. As the contamination level increases, the discharge level of the insulator samples also intensifies, resulting in the increase of total harmonic distortion and fundamental frequencies. Total harmonic distortion and fundamental frequencies of the UV signals were employed to develop a technique based on artificial neural networks (ANNs) to classify the flashover prediction based on the discharge intensity levels of the insulator samples. The results of the ANN simulation showed 87% accuracy in the performance index. This study illustrates that the UV pulse detection method is a potential tool to monitor insulator surface conditions during service.

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Su, TY, SB Yaakob i AM Ariffen. "Modelling and analysis of electrical performance outdoor glass insulator under various services and lightning impulse". Journal of Physics: Conference Series 2550, nr 1 (1.08.2023): 012021. http://dx.doi.org/10.1088/1742-6596/2550/1/012021.

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Abstract This paper is focus on modelling of glass type insulator with voltage rating of 275 kV. The glass insulators are still widely served in overhead transmission line because of its high dielectric strength capability. However, their outdoor application has resulted in the exposure to the various service conditions such as weather, pollution and lightning conditions. Further, the inclination effect of the insulator under the nominal voltage and lightning impulse is modelling through Finite Elementary Method (FEM). Then, the model of glass insulator is constructed in three different inclination angles by using the Ansys Maxwell 3D for simulation purpose. The results show the inclined insulator due to the wind load effect has the lowest breakdown voltage at most 53.33% compared with the vertical insulator. Under the outdoor environment factors such as humid, wet and contamination, the localized electric field and current density had increased significantly. Consequently, this situation may cause the power losses, localized heating effect also reduces the electrical performance of the insulators.

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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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Mousa, Mohammed Imran, Zulkurnain Abdul-Malek i Zainab Imran Mousa. "Aging Detection of Glass Disc Insulator by using Infrared Camera". Indonesian Journal of Electrical Engineering and Computer Science 6, nr 3 (1.06.2017): 520. http://dx.doi.org/10.11591/ijeecs.v6.i3.pp520-527.

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<p>Suitable diagnostic techniques for outdoor glass insulators are important for ensuring the reliablilty and stability of power system. The possibility of insulator flash-over increases, especially when the insulator is covered by pollution layers or has an internal defect. In this paper, a new technique to detect the pollution level and invisible damage by measuring the surface temperature of glass disc insulators is proposed. A high definition camera had been used to determine the surface temperatures of four glass insulators. The effects of applied voltage on the surface temperature and its distribution were studied. The results show the possibility of using the infrarad camera to detect the aging level and invisible damages of the glass insulators.</p>

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Salem, Ali A., R. Abd-Rahman, M. S. Kamarudin, H. Ahmad, N. A. M. Jamail, N. A. Othman, M. T. Ishak, M. N. R. Baharom i S. Al-Ameri. "Proposal of a dynamic numerical approach in predicting flashover critical voltage". International Journal of Power Electronics and Drive Systems (IJPEDS) 10, nr 2 (1.06.2019): 602. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp602-610.

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<span lang="EN-US">Glass insulators, due to its diverse characteristics, were used widely around the world for high voltage transmission lines. Surfaces of the insulators are exposed to high electrical, mechanical, and thermal stresses over the period of service. Accumulation of contamination distort stresses distribution along the insulators that may lead to flashover under severe condition. In this paper, Obenaus pollution model has been adopted to propose a dynamic mathematical modelling to determine flashover critical voltage with regard to parameters such as pollution conductivity, arc length, and width of layer of contamination on the surface of glass insulator. In addition, laboratory experimental works have been carried out according to IEC60305 to validate the results from numerical approach, which indicate a good agreement.</span>

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Nallusamy, S., M. Saravanakumar i B. Sathis Kumar. "Investigation of Environmental Conditions Using Artificial Polluted Conditions for Selection of Insulator Material". Advanced Engineering Forum 24 (październik 2017): 1–11. http://dx.doi.org/10.4028/www.scientific.net/aef.24.1.

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The aim of this research is to find out suitable material for insulator and their flashover performance to withstand the high pollution degree in different environmental conditions. The experimental investigation was carried out on various insulating material like porcelain, glass, and rubber to find out the artificial effluence to examine alternate current flashover potentials. The result shows that the polluted flashover voltage is affected by equivalent salt deposit density and non soluble deposit density, the authorities of which are autonomous of each one on another. The correction formulae of the flashover voltage of various insulators at various salt deposit density and non soluble deposit density levels have pointed out by means of the flashover voltages examination. Also the dissimilarity existing between the flashover voltages of various types of polluted insulators. From this we are able to conclude which insulating material withstands the pollution degree better amongst the above three.

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Xing, Yunqi, Yixuan Wang, Jiakai Chi, Haoliang Liu i Jin Li. "Study on Improving Interface Performance of HVDC Composite Insulators by Plasma Etching". Coatings 10, nr 11 (27.10.2020): 1036. http://dx.doi.org/10.3390/coatings10111036.

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High-voltage direct-current composite insulators are faced with various challenges during operation, such as creeping discharge, umbrella skirt damage, abnormal heating and insulator breakage. Among them, the aging of the interface between the core rod and the sheath is one of the important causes of composite insulator failure. In order to improve the electrical resistance of the composite insulator interface, this study uses plasma etching to modify the surface of the glass-fiber-reinforced epoxy resin plastic to prepare the high-voltage direct-current composite insulator core rod–sheath samples. By analyzing the surface morphology of the epoxy resin, static contact angle and surface charge transfer characteristics, the control mechanism of the plasma etching treatment on the interface bonding performance and leakage current of composite insulator core rod–sheath samples were studied. The results show that proper etching time treatment can improve the trap energy level distribution and microstructure of epoxy resin and increase the discharge voltage along the surface; chemical bonding plasma etching can improve the interfacial bonding performance of core rod–sheath samples sheaths, reduce the leakage current of composite insulator core rod–sheath samples sheath specimens and improve their interfacial performance.

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Wang, Jinyu, Yingna Li i Wenxiang Chen. "Detection of Glass Insulators Using Deep Neural Networks Based on Optical Imaging". Remote Sensing 14, nr 20 (15.10.2022): 5153. http://dx.doi.org/10.3390/rs14205153.

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As the pre-part of tasks such as fault detection and line inspection, insulator detection is a crucial task. However, considering the complex environment of high-voltage transmission lines, the traditional insulator detection accuracy is unsatisfactory, and manual inspection is dangerous and inefficient. To improve this situation, this paper proposes an insulator detection model Siamese ID-YOLO based on a deep neural network. The model achieves the best balance between speed and accuracy compared with traditional detection methods. In order to achieve the purpose of image enhancement, this paper adopts the canny-based edge detection operator to highlight the edges of insulators to obtain more semantic information. In this paper, based on the Darknet53 network and Siamese network, the insulator original image and the edge image are jointly input into the model. Siamese IN-YOLO model achieves more fine-grained extraction of insulators through weight sharing between Siamese networks, thereby improving the detection accuracy of insulators. This paper uses statistical clustering analysis on the area and aspect ratio of the insulator data set, then pre-set and adjusts the hyperparameters of the model anchor box to make it more suitable for the insulator detection task. In addition, this paper makes an insulator dataset named InsuDaSet based on UAV(Unmanned Aerial Vehicle) shoot insulator images for model training. The experiments show that the insulator detection can reach 92.72% detection accuracy and 84FPS detection speed, which can fully meet the online insulator detection requirements.

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Rozprawy doktorskie na temat "High Voltage glass insulator"

Alles, Joan. "Investigations on flashover of polluted insulators : Influence of silicone coating on the behavior of glass insulators under steep front impulse". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC058.

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Cette thèse s’inscrit dans le cadre de l’amélioration du comportement électrique des isolateurs de lignes haute tension ; l’objectif est d’assurer une meilleure fiabilité et qualité d’alimentation en énergie électrique. Ce travail a été motivé par la nécessité de répondre à trois questions liées au comportement des isolateurs verre en zone polluée. La première porte sur la recherche d’une méthode permettant de calculer la tension de contournement des chaînes polluées selon le type d’isolateur et ses caractéristiques. La deuxième question concerne la différence de comportement entre les isolateurs en verre et les isolateurs en porcelaine de type « outerrib » ; ce type d’isolateurs présente une forme spécifique adaptée aux environnements à forte pollution. Les tensions de contournement ainsi que les trajectoires de l’arc sur les isolateurs en verre sont très différentes de celles observées avec les isolateurs en porcelaine. Et la troisième question est relative à la défaillance des isolateurs recouverts de silicone lors des essais en chocs (des impulsions de tension) à front raide. En effet, les isolateurs recouverts d’une couche de 0.3 mm (ou plus) de silicone hydrophobe explosent lorsqu’ils sont soumis à des impulsions de tension à front raide d’amplitude très élevée pendant un temps très court. Différents mécanismes pouvant être à l’origine de l’explosion/éclatement des isolateurs recouverts d’une couche de silicone sont discutés. Il ressort des différents tests et analyses que le mécanisme le plus probable semble être la fragmentation par plasma. En effet, suite à l’application d’une tension à front raide, d’amplitude très élevée, des canaux (fissures) microscopiques prennent naissance là où le champ électrique est le plus intense. L’application répétitive des chocs de tension conduit au développement de décharges dans ces canaux (rupture diélectrique de l’air) c’est-à-dire des arcs (canaux de plasma) qui se développent/propagent dans le volume de l’isolateur. La puissance déchargée (c’est-à-dire l’énergie stockée dans les condensateurs du générateur en des temps très courts) dans ces canaux à chaque choc étant très élevée, elle conduit à l’explosion de l’isolateur après quelques chocs (parfois 5 ou 6 suffisent): c’est la fragmentation par plasma
This thesis deals with the improvement of the electrical behavior of insulators of high voltage lines; the objective is to ensure better reliability and quality of power supply. This work was motivated by the need to answer three questions related to the behavior of glass insulators in polluted areas. The first one concerns the search for method for calculating the flashover voltage of polluted chains according to the type of insulator and its characteristics. The second question concerns the difference in behavior between glass insulators and "outerrib" porcelain insulators; this type of insulator has a specific shape adapted to environments with high pollution. The flashover voltages as well as the trajectories of the arc on glass insulators are very different from those observed with porcelain insulators. And the third issue is the failure of silicon-coated insulators during shock tests (pulses) with a steep front. Indeed, insulators coated with a layer of 0.3 mm (or more) of hydrophobic silicone explode when subjected to very high amplitude steep-edge voltage pulses for a very short time. Different mechanisms that may be responsible for the explosion / puncturing of insulators covered with a layer of silicone are discussed. It appears from the various tests and analyzes that the most probable mechanism seems to be plasma fragmentation (cracking). Indeed, following the application of a steep front voltage, of very high amplitude, microscopic channels (fissures) originate where the electric field is most intense. The repetitive application of impulse voltages (shocks) leads to the development of discharges in these channels (breakdown of the air), i.e.; arcs (plasma channels) which develop / propagate in the volume of the insulator. The discharged power (i.e.; the energy stored in the capacitors of the generator in a very short times) in these channels (cracks) at each shock being very high, leads to the explosion of the insulator after some shocks (5 to 6 sometimes): it is the fragmentation by plasma or plasma cracking

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Nguyen, Duc Hai. "Source-insulator interaction in high-voltage pollution tests". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74235.

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This work develops a digital-computer simulation of the interaction between an artificially polluted insulator and a high-voltage direct-current (HVDC) or an alternating-current (AC) source configuration.
The polluted-insulator model includes conditions for the existance of arcs on contaminated surfaces; arc motion, speed of arc propagation, and arc reignition criteria; and thermodynamic phenomena in an unbridged wet layer. The effect of the source parameters on the leakage current waveform, the dynamic voltage drop and the critical flashover voltage is systematically investigated and supported by experimental results. The simulation results are used to establish the HV test source requirements and provide guidance for the design of the test source.
For an AC source, it is important to consider the equivalent shunt capacitance in addition to the short-circuit current and the transformer reactance/resistance ratio when interpreting pollution test results. The use of series capacitance to compensate for a weak source is also considered.
In the case of a DC source, the mean voltage drop during a critical leakage current impulse proves to be a better indicator of the error in the measured critical voltage. The studies are extended for the DC source configurations most commonly used by power utilities today.

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Šedivý, Matúš. "Vliv vysokého napětí na různé materiály v nízkém a vysokém vakuu". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318194.

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The beginning of this thesis contains an overview of properties of the insulators, and description of insulators that were used for in depth research of surface breakdown in vacuum. Furthermore, this work focuses on mechanisms of an electric breakdown initiation at the interface of the solid insulator and surrounding low pressure gas. Multiple methods for measurements of dielectric strength are examined. The experimental part describes the measurements performed in the vacuum chamber. The results of these measurements are then analysed. In conclusion, used insulators are compared and suggestions for further work are given.

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Heinle, Ulrich. "Vertical High-Voltage Transistors on Thick Silicon-on-Insulator". Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3179.

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More and more electronic products, like battery chargers and power supplies, as well as applications in telecommunications and automotive electronics are based on System-on-Chip solutions, where signal processing and power devices are integrated on the same chip. The integration of different functional units offers many advantages in terms of reliability, reduced power consumption, weight and space reduction, leading to products with better performance at a hopefully lower price. This thesis focuses on the integration of vertical high-voltage double-diffused MOS transistors (DMOSFETs) on Silicon-on-Insulator (SOI) substrates. MOSFETs possess a number of features which makes them indispensable for Power Integrated Circuits (PICs): high switching speed, high efficiency, and simple drive circuits. SOI substrates combined with trench technology is superior to traditional Junction Isolation (JI) techniques in terms of cross-talk and leakage currents. Vertical DMOS transistors on SOI have been manufactured and characterized, and an analytical model for their on-resistance is presented. A description of self-heating and operation at elevated temperatures is included. Furthermore, the switching dynamics of these components is investigated by means of device simulations with the result that the dissipated power during unclamped inductive switching tests is reduced substantially compared to bulk vertical DMOSFETs. A large number of defects is created in the device layer if the trenches are exposed to high temperatures during processing. A new fabrication process with back-end trench formation is introduced in order to minimize defect generation. In addition, a model for the capacitive coupling between trench-isolated structures is developed.

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Warnock, Shireen M. "Dielectric reliability in high-voltage GaN metal-insulator-semiconductor high electron mobility transistors". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112032.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references.
As the demand for more energy-efficient electronics increases, GaN has emerged as a promising transistor material candidate for high-voltage power management applications. The AlGaN/GaN Metal-Insulator-Semiconductor High Electron Mobility Transistor (MIS-HEMT) constitutes the most suitable device structure for this application as it offers lower gate leakage than its HEMT counterpart. GaN has excellent material properties, but there are still many challenges to overcome before its widespread commercial deployment. Time-dependent dielectric breakdown (TDDB), a catastrophic condition arising after prolonged high-voltage gate stress, is a particularly important concern. This thesis investigates this crucial reliability issue in depth. Using a robust characterization strategy, we have studied not only the dielectric breakdown behavior in GaN MIS-HEMTs but also the evolution of the device subthreshold characteristics in the face of high bias stress. This allows us to work towards understanding on a more physical level the underlying degradation behind dielectric breakdown in order to inform future device lifetime models. We begin by looking at positive gate stress TDDB, a classic condition studied in the silicon CMOS community for many years. In order to understand the impact of TDDB, we must also understand how transient degradation effects such as threshold voltage (VT) shift may impact our results and ensure we can disentangle the permanent degradation associated with TDDB. With the foundational understanding of TDDB we establish under these positive gate stress conditions, we turn our attention to OFF-state stress which is a more relevant stress condition that mimics the most common state of these GaN power switching transistors in power management circuits. In order to develop accurate lifetime models for GaN MIS-HEMTs, we show that much care must be taken to ensure that device lifetime does not become distorted by transient trapping-related degradation effects. It is also crucial to have a physics-based lifetime model that gives confidence in making lifetime projections from data collected in the span of hours to lifetime estimations on the order of many years.
by Shireen Warnock.
Ph. D.

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Noborio, Masato. "Fundamental Study on SiC Metal-Insulator-Semiconductor Devices for High-Voltage Power Integrated Circuits". 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/78006.

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Banik, Apu. "Condition assessment of high voltage insulators in different environments with non-sinusoidal excitation". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/206148/1/Apu_Banik_Thesis.pdf.

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This project was a step forward in investigating the effect of supply voltage harmonic contents on the measured leakage current of polluted insulators operating in different environments. This study was then used as a basis for developing a sound theoretical understanding of the effects of supply voltage harmonic contents on the measured leakage current characteristics. This study was also used to develop a new condition monitoring index for the polluted insulator under harmonically distorted supply voltage.

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Vosloo, Wallace L. (Wallace Lockwood). "A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52625.

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Thesis (PhD)--University of Stellenbosch, 2002.
ENGLISH ABSTRACT: The main aim of this research programme was to compare the relative performance of different insulator materials used in South Africa when subjected to a severe marine pollution environment. A test programme and procedure, test facility and instrumentation were established. Some novel instrumentation and monitoring equipment were developed and built specifically for this research programme, supported by data analysing software programs. In order to compare material performance only, all non-material design variables between the test insulators had to be removed (e.g. creepage distance, connecting length, inter-shed spacing, profile, etc.). To achieve this some of the test insulators had to be specially manufactured. Leakage current, electrical discharge activity, climatic and environmental data was collected successfully over a one-year test period, starting with new test insulators. The peak and energy values of the leakage current were identified as the two main parameters needed to describe the leakage current activity on the test insulators. A correlation was found between the climatic and environmental data and the leakage current data, and it was found that the leakage current can be determined successfully from some of the climatic and environmental parameters monitored by using multiple regression techniques. Surface conductivity and energy were found to be the best parameters to show the maximum and continuous interaction of the insulator material surface with the electrolytic pollution layer. A natural ageing and pollution test procedure was developed, which has become a South African standard and is gaining international acceptance. A model and hypothesis are proposed to describe the electrical discharge activity that takes place on the test insulators and explain the difference in leakage current performance of the various materials. Keywords: Insulator, Pollution, High Voltage, Leakage current, Material performance.
AFRIKAANSE OPSOMMING: Die hoofdoel van hierdie navorsingsprogram was om die relatiewe prestasie van verskillende isolatormateriale wat in Suid-Afrika gebruik word te vergelyk in 'n swaar besoedelde marine omgewing. 'n Toetsprogram en prosedure, toets fasiliteit en instrumentasie is gevestig. 'n Paar nuwe instrumente en moniteer toerusting is ontwikkel en gebou spesifiek vir hierdie navorsingsprogram, gesteun deur data analise sagteware programme. Ten einde slegs materiaalprestasie te vergelyk, moes alle nie-materiaal ontwerpsveranderlikes tussen die toetsisolators verwyder word (bv. kruipafstand, konnekteer lengte, tussen-skerm spasiëring, profiel, ens.). Om dit reg te kry moes sommige van die toetsisolators spesiaal vervaardig word. Lekstroom, elektriese ontladingsaktiwiteit, klimaat en omgewingsdata is suksesvol versameloor 'n een-jaar toetsperiode, beginnende met nuwe toets isolators. Die piek en energie waardes van die lekstroom is identifiseer as die twee hoof parameters wat nodig is om die lekstroomaktiwiteit op die toetsisolators te beskryf. 'n Korrelasie is gevind tussen die klimaat- en omgewingsdata en die lekstroom data, en dit is gevind dat die lekstroom data suksesvol bepaal kan word van sekere van die klimaat- en omgewingsparameters wat gemoniteer is deur veelvoudige regressie tegnieke te gebruik. Oppervlakskonduktiwiteit en energie is gevind die beste parameters te wees om die maksimum en kontinue interaksie van die isolatormateriaaloppervlak met die elektrolitiese besoedelingslaag aan te toon. 'n Natuurlike veroudering en besoedeling toetsprosedure is ontwikkel, wat 'n Suid-Afrikaanse standaard geword het en besig is om internastionale aanvaarding te wen. 'n Model en hipotese word voorgestelom die elektriese ontladingsaktiwiteit wat op die toetsisolators plaasvind te beskryf en om die verskil in lekstroomprestasie van die verskeie materiale te verduidelik. S/eufelwoorde: Isolator, Besoedeling, Hoog Spanning, Leek stroom, Materiaal prestasie.

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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.

QC 20151002

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Elombo, Andreas Iyambo. "An evaluation of HTV-SR insulators with different creepage lengths under AC and bipolar DC in marine polluted service conditions". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20236.

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Thesis (MScEng)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: The use of high voltage direct current (HVDC) applications has gained enormous popularity for long distance power transmission. This is due to the lucrative benefits offered by this type of power transmission technology when compared to the traditional high voltage alternative current (HVAC). This new shift in the paradigm of power system design has led to the increased interest in the research that focuses on issues relating to the reliability of power supply associated with HVDC. Amongst such issues, insulation coordination has increasingly become a challenging task that continues to receive renewed research focus. It has been convincingly demonstrated, both from field experience and laboratory research, that insulator contamination constitutes a multifaceted phenomenon, especially when transmission voltages ramp up into high operating voltage levels. More so, this is particularly interesting with reference to the increasing applications of high voltage direct current (HVDC). The recently commissioned HVDC power-line in Namibia is one of the major motivations upon which NamPower (Namibia‟s national power utility) has committed financial resources to research on insulator pollution performance. This project was a part of NamPower‟s research initiative – seeking to investigate the phenomena associated with insulator pollution performance under natural pollution environments when energized under both AC and DC excitation voltage types. The significance of this research is especially crucial for HVDC applications given the paucity of research conducted on the DC performance of insulators, under natural pollution environments. This study was conducted at the Koeberg Insulator Pollution Test Station (KIPTS) on the west coast of Cape Town in the Western Cape province of South Africa. KIPTS is an internationally recognized insulator pollution test facility, which is widely used by both insulator manufacturers and academic researchers from many parts of the world. STRI and ABB, both Swedish-based companies, are good examples of international subscribers to the KIPTS research facility. The first objective of this research was to design a suitable DC excitation voltage system for both DC+ and DC- to be used at KIPTS. This apparatus was designed and built at the University of Stellenbosch. The second objective was to conduct a comparative evaluation of the performance of high temperature vulcanized silicone rubber (HTV-SR) power line insulators under AC, DC+ and DC- when subjected to natural pollution conditions at KIPTS. All test insulators were made from the same material and sourced from the same manufacturer – having different creepage lengths. Five different creepage lengths were considered for each excitation voltage – summing up to fifteen HTV-SR test samples. A standard DC glass disc insulator was also installed on each excitation voltage as a control sample. It was therefore envisaged that this study would give rise to new research questions, leading to future explorations on the subject. With reference to weather monitoring and leakage current measurements (using an online leakage current monitoring device - OLCA), a correlation was found to exist between the variations in climatic conditions and the corresponding occurrence of leakage current on the insulator surfaces. High leakage current levels were recorded in summer due to the high pollution levels that were measured in that season (using the equivalent salt deposit density (ESDD) approach). Winter, in contrast, had lower levels of leakage current recorded. This corresponds to a high prevalence of rainfall in winter, which caused occasional natural washing of the insulator surfaces. The leakage current levels for the HTV-SR insulators were of a similar order of magnitude for AC and DC+ and lower for DC-. The harshest pollutants (with high conductivities, as measured with the directional dust deposit gauges (DDDG)) were found to have emanated largely from the south. As a result, most instances of erosion were observed in the southward direction on the test insulators. The electrical discharge activity observations, conducted at night, had revealed that dryband corona (DBC) and dryband discharge (DBD) prominently occurred on the terminating sheaths (both live and ground ends) and bottom side of HTV-SR and glass disc insulators, respectively. This justifies the dominance of erosion that was observed on the terminating sheaths and bottom side of HTV-SR and glass disc insulators, respectively. Flashover events were recorded on the shortest HTV-SR insulator installed on DC+ and the glass disc insulator installed on DC-. All flashover events occurred in summer (the harshest season at KIPTS). Two interesting observations, albeit unexplained, were observed: star-shaped erosion on the shed bottoms of the HTV-SR insulators installed on DC+ and material peel-off at the shed-to-sheath bonding interface of the HTV-SR insulators installed on DC-. These observations therefore require further investigation in order to establish possible explanations.
AFRIKAANSE OPSOMMING: Die gebruik van hoë gelykspanning (HSGS) het baie gewild geword vir kragtransmissie oor lang afstande. Dit is as gevolg van die uitstekende voordele wat hierdie tipe tegnologie teenoor die tradisionele hoë wisselspanning (HSWS) bied. Hierdie paradigmaskuif in die ontwerp van kragstelsels het tot verhoogde belangstelling in navorsing gelei wat betrekking het op aspekte wat verband hou met die betroubaarheid van kragvoorsiening deur HSGS. Van hierdie aspekte word isolasiekoördinasie toenemend ŉ uitdagende taak en navorsing word tans daarop toegespits. Daar bestaan oortuigende bewyse, gebaseer op laboratorium- en veldtoetse dat isolatorbesoedeling ŉ verskynsel met vele fasette is, veral wanneer hoër spannings gebruik word. Dit is in „n meerdere mate van belang met verwysing na toepassings van HSGS. Die onlangs inbedryfgestelde HSGS kraglyn in Namibië is een van die hoofmotiverings vir die verskaffing van geldelike steun deur NamPower (Namibië se nasionale kragvoorsiener) vir navorsing oor die besoedelingsprestasie van isolators. Hierdie projek is deel van NamPower se navorsingsinisiatief om verskynsels betreffende die besoedelingsprestasie van isolators in natuurlik-besoedelde omgewings te ondersoek, onder WS en GS-bekragtiging. Die betekenis van hierdie navorsing is veral belangrik vir die HSGS-toepassings in die lig van die skaarsheid van navorsing oor die GS-prestasie van isolators in natuurlik-besoedelde omgewings. Hierdie studie is gedoen by die Koeberg isolatorbesoedelingstoetsstasie (KIPTS) aan die weskus van die Wes-Kaap. KIPTS is 'n internasionaal-erkende toetsfasiliteit en word algemeen gebruik deur beide isolatorvervaardigers en akademiese navorsers uit baie dele van die wêreld. STRI en ABB, albei Sweeds-gebaseerde maatskappye, is die goeie voorbeelde van die internasionale gebruikers van die KIPTS navorsingsfasiliteit. Die oogmerk van hierdie navorsing was om eerstens 'n geskikte GS-kragbron vir beide die GS+ en die GS- vir gebruik by KIPTS te ontwerp. Hierdie apparaat is ontwerp en gebou deur die Universiteit van Stellenbosch. Tweedens is 'n vergelykende evaluering van die prestasie hoë temperatuur gevulkaniseerde silikoon (HTV-SR) kraglynisolators onder WS, GS+ en GS– onder natuurlike besoedeling by die KIPTS uitgevoer. Alle toetsisolators is van dieselfde materiaal gemaak en is afkomstig van dieselfde vervaardiger, maar het verskillende kruipafstande. Vyf verskillende kruipafstande is gebruik vir elke tipe spanning  'n totaal van vyftien HTV-SR toets monsters. 'n Standaard GS glasisolatorskyf is ook vir elke spanning as' n kontrolemonster geïnstalleer. Dit kan dus verwag word dat hierdie studie aanleiding sal gee tot nuwe navorsingsvrae, wat kan lei tot verdere toekomstige ondersoeke oor die onderwerp. Met verwysing na die monitering van die weer en die lekstroommetings (met behulp van 'n aanlyn-lekstroommoniteringstoestel - OLCA), is 'n korrelasie gevind tussen die variasie in klimaatstoestande en die ooreenstemmende voorkoms van lekstroom op die isolator- oppervlaktes. Hoë lekstroomvlakke is waargeneem in die somer, as gevolg van die hoë besoedelingsvlakke wat in daardie seisoen gemeet is (met behulp van die ekwivalente soutneerslag-digtheid (ESDD) metode). In die winter, in teenstelling, is die laagste vlakke van lekstroom aangeteken. Dit stem ooreen met 'n hoë voorkoms van reënval in die winter, wat die isolatoroppervlaktes van tyd tot tyd natuurlik gewas het. Die lekstroomvlakke op die HTV-SR isolators was van soortgelyke ordegrootte vir WS en GS+ maar laer vir GS-. Dit is bevind dat die ergste besoedelingstowwe, met 'n hoë geleiding, soos gemeet met die rigtingsensitiewe stofneerslagsmeters (DDDG), hoofsaaklik uit ŉ suidelike rigting kom. As gevolg hiervan, is die meeste gevalle van erosie aan die suidekant van die toetsisolators waargeneem. Die waarneming van elektriese ontladingsaktiwiteit in die nag, het aan die lig gebring dat droëbandkorona (DBC) en droëbandontladings (DBD) prominent voorgekom het op die skedes aan die uiteindes (beide lewende en grond kante) en onderste kant van HTV-SR en glasskywe, onderskeidelik. Oorvonkings is waargeneem op die kortste HTV-SR isolator op GS+ en op die glasisolator op GS-. Al die oorvonkings het in die somer (die ergste seisoen by KIPTS) voorgekom. Twee interessante, dog onverklaarbare, verskynsels is waargeneem: stervormige erosie aan die onderkante van die skerms van die HTV-SR isolators op GS+ en material-afskilfering by die skerm-skede tussenvlak van die HTV-SR isolators op GS-. Hierdie verskynsels vereis verdere ondersoek ten einde moontlike verklarings vas te stel.

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Książki na temat "High Voltage glass insulator"

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

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Maltisovs, Matīss. Operating Methods of High Voltage Bistable Smart Glass Electronics Systems. RTU Press, 2022. http://dx.doi.org/10.7250/9789934227448.

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The Thesis focuses on Smectic-A (SmA) liquid crystals' (LCs) functional behaviour in order to understand if this will be the next generation product that could improve the daily life of the society. The optical properties of this liquid crystal are by far the best compared to the products available in the market, i.e., the light transmittance in transparent state is >85 % and in scatter state <2 %. Enabling the LC to be used for a variety of purposes, such as smart windows to scatter light on a sunny day or provide a sense of privacy in an open type office space. An in-depth literature review discusses the existing studies, obtained experimental data and attempts to develop functional products. The main unresolved problems are highlighted, described in detail and solutions are offered. In order to understand the potential of SmA LC in the smart glass/window technology, analysis of existing products was performed, a summary of an active smart glass/windows provided, and a comparative study between them was made. In addition, an in-depth study of long-term functional stability was performed during which the most popular types of defects were listed and analysed. Solutions for defect elimination and recommendations for optimization of switching systems and production processes are provided. A methodology for determining the electrical parameters of an LC has been developed in order to create an electrical simulation model and facilitate the development of electronic switching systems.

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Części książek na temat "High Voltage glass insulator"

Yao, Hang, Boxue Du, Jin Li i Zehua Wang. "Surface Functionally Graded Insulator for High Voltage Gas Insulated Apparatus". W Polymer Insulation Applied for HVDC Transmission, 549–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9731-2_21.

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Udrea, F., H. T. Lim, D. Garner, A. Popescu, W. Milne i P. L. F. Hemment. "Thin Partial SOI Power Devices for High Voltage Integrated Circuits". W Perspectives, Science and Technologies for Novel Silicon on Insulator Devices, 321–27. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4261-8_31.

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Tan, Xu, Fan Yang, Yan Li, Jinqiao Du, Yong Yi, Jie Tian i Zijun Liu. "An Identification Method for High Voltage Power Grid Insulator Based on Mobilenet-SSD Network". W Atlantis Highlights in Intelligent Systems, 160–70. Dordrecht: Atlantis Press International BV, 2023. http://dx.doi.org/10.2991/978-94-6463-222-4_15.

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Kamarudin, Najwa, Jeefferie Abd Razak, Nurbahirah Norddin, Noraiham Mohamad, Lau Kok Tee, Tony Chew i Nurzallia Mohd Saad. "Hardness and Water Absorption Properties of Silicone Rubber Based Composites for High Voltage Insulator Applications". W Lecture Notes in Mechanical Engineering, 343–52. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9539-0_34.

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Benguesmia, Hani, Nassima M’Ziou i Ahmed Boubakeur. "AC Flashover: An Analysis with Influence of the Pollution, Potential and Electric Field Distribution on High Voltage Insulator". W Applied Condition Monitoring, 269–79. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14532-7_28.

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Heylen, A. E. D., S. E. Hartles, A. Noltsis i Derek Dring. "Low and High Voltage Distribution Along a Cap and Pin Insulator String Subjected to AC and Impulse Voltages". W Gaseous Dielectrics VI, 267–72. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3706-9_33.

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Durga Sai Surya M, G. N., K. Prabha Rani i K. V. S. R. Murthy. "Effect of Pollution on Insulators in High Voltage Transmission Line". W Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220772.

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This work provides the effects of pollution on insulators in high voltage transmission line. Different stress such as electrical, mechanical and environmental stress on outdoor insulator has been discussed in this paper. Comparative performance of different insulators have been provided in this paper. . An insulator constructed of ceramic and glass is one of the components used in the construction of overhead transmission lines. In the insulator, the material used to create the insulation has excellent insulating properties. However, as a result of the outside environment and atmosphere, the insulation qualities of overhead insulators gradually deteriorate and become severely reduced. Electrical stress, mechanical stress, and environmental stress are the three types of stress that can be applied to insulators in general, according to their function. Polymeric insulators, in addition to ceramic and glass insulators, are also utilized in the building of overhead insulators to keep the electricity flowing.

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"Manufacture of tempered-glass insulators". W Insulators for High Voltages, 66–69. Institution of Engineering and Technology, 1988. http://dx.doi.org/10.1049/pbpo007e_ch4.

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Suryanarayana, S. Venkata, Katakam Koushik i Prabu Sevugan. "Insulator Fault Detection From UAV Images Using YOLOv5". W Advances in Computational Intelligence and Robotics, 79–91. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-8098-4.ch005.

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Identification of insulator defects is one of the most important goals of an intelligent examination of high-voltage transmission lines. Because they provide mechanical support for electric transmission lines as well as electrical insulation, insulators are essential to the secure and reliable operation of power networks. A fresh dataset is first built by collecting aerial pictures in various scenes that have one or more defects. A feature pyramid network and an enhanced loss function are used by the CSPD-YOLO model to increase the precision of insulator failure detection. The insulator defective data set, which has two classes (insulator, defect), is used by the suggested technique to train and test the model using the YOLOv5 object detection algorithm. The authors evaluate how well the YOLOv3, YOLOv5, and related families perform when trained on the insulator defective dataset. Practitioners can use this information to choose the appropriate technique based on the insulator defective dataset.

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"Impact of Local High-κ Insulator on Drivability and Standby Power of Gate-All-Around SOI MOSFET". W MOS Devices for Low-Voltage and Low-Energy Applications, 228–40. Singapore: John Wiley & Sons Singapore Pte. Ltd, 2016. http://dx.doi.org/10.1002/9781119107361.ch20.

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Streszczenia konferencji na temat "High Voltage glass insulator"

Hyvonen, P., J. V. Kluss i P. Taklaja. "AC-voltage performance of field aged glass insulator strings". W 2014 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2014. http://dx.doi.org/10.1109/ichve.2014.7035428.

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Tian, Liang, Zhijin Zhang, Xingliang Jiang, Lichun Shu, Jianlin Hu i Hu Qin. "Study on the Icing Accretion Characterization of Porcelain and Glass Insulator". W 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8642201.

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Bezerra, R. C., E. L. Kowalski, F. W. S. Conceicao, J. M. T. Teixeira i O. G. Santos Filho. "Instrumental Inspection Methodology to Evaluate Corrosion in Transmission Line Glass Insulator Metallic Pins". W 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8642079.

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Ilomuanya, C. S., A. Nekahi i S. Farokhi. "Acid Rain Pollution Effect on the Electric Field Distribution of a Glass Insulator". W 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8642231.

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Zhang, Chuyan, Shuwei Wan, Liming Wang i Zhicheng Guan. "Pollution flashover performance of 220 kV glass insulator strings covered with incomplete spraying PRTV coatings". W 2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC). IEEE, 2012. http://dx.doi.org/10.1109/ipmhvc.2012.6518775.

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Yafeng, Chao, Yang Yi, Zhang Liu, Xu Zhiqiang, Yue Yishi i Liao Zhenyu. "Analysis and Suggestion on String Breakage Failure of Glass Insulator in 500kV Transmission Line". W 2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2020. http://dx.doi.org/10.1109/ichve49031.2020.9279573.

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Lu, Yi, Yanfeng Gao, Tiansong Gu, Shuyuan Wang, Hongliang Li, Xin Wang, Xu Zhang i in. "Thermal Degradation Investigation of Glass Fiber Reinforced Polymer used in High Voltage Composite Insulator Core". W 2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2020. http://dx.doi.org/10.1109/ichve49031.2020.9279910.

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Leite, L. R. P., J. A. Yanaguizawa, A. H. Shinohara, E. G. Costa, G. J. V. Xavier i D. A. Maciel. "Experimental Study of Electrical Breakdown Voltage of a Glass Insulator Strings with Different Numbers of Broken Units". W 2008 IEEE International Power Modulators and High Voltage Conference (IPMC). IEEE, 2008. http://dx.doi.org/10.1109/ipmc.2008.4743639.

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Alles, J., A. Beroual, J.-M. George i E. Brocard. "Evaluation of electrical performance on high voltage glass suspended insulators". W 2017 IEEE Electrical Insulation Conference (EIC). IEEE, 2017. http://dx.doi.org/10.1109/eic.2017.8004688.

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Zheng, Y., Y. Chen, H. Zhang i Y. V. Serdyuk. "AC Breakdown Characteristics of Air Insulated Sphere-Plane Gaps with Glass Barriers". W 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8641965.

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Raporty organizacyjne na temat "High Voltage glass insulator"

Hansen, P. M., i G. Dann. Impulse Flashover Tests at Edgar Beauchamp High Voltage Test Facility, Dixon, California, in Support of Cutler Insulator Failure Investigation. Fort Belvoir, VA: Defense Technical Information Center, lipiec 2006. http://dx.doi.org/10.21236/ada456144.

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