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Journal articles on the topic 'Electric Insulation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hadi, Nabipour Afrouzi, Zulkurnain Abdul-Malek, Saeed Vahabi Mashak, and A. R. Naderipour. "Three-Dimensional Potential and Electric Field Distributions in HV Cable Insulation Containing Multiple Cavities." Advanced Materials Research 845 (December 2013): 372–77. http://dx.doi.org/10.4028/www.scientific.net/amr.845.372.

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Cross-linked polyethylene is widely used as electrical insulation because of its excellent electrical properties such as low dielectric constant, low dielectric loss and also due to its excellent chemical resistance and mechanical flexibility. Nevertheless, the most important reason for failure of high voltage equipment is due to its insulation failure. The electrical properties of an insulator are affected by the presence of cavities within the insulating material, in particular with regard to the electric field and potential distributions. In this paper, the electric field and potential dist

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2

Demidov, A. N., M. A. Karimbekov, and A. Yu Marchenkov. "Heating and Cooling Impact on Mechanical Properties of RIP Electric Insulator for High Voltage Inputs." Solid State Phenomena 265 (September 2017): 496–500. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.496.

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The mechanical properties investigation results obtained by tension and indentation tests of RIP (resin impregnated paper) electric insulator are presented. Tension and indentation tests of the RIP electric insulation material in wide temperature range are conducted. The common relations between strength and temperature as well as between hardness and temperature for the RIP electric insulation are established. The ratio of ultimate tensile strength to Brinell hardness is performed to be constant (about 1/3) irrespective of temperature, that means a possibility of the RIP electric insulation m

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3

Chandavong, Sackthavy, Kittipong Tonmitr, and Arkom Kaewrawang. "The Distinguishing Quality of Water Droplets on Insulating Surface under AC and DC Electric Field Stress." Advanced Materials Research 1025-1026 (September 2014): 803–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.803.

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This paper presents the comparison of water droplets on insulating surface under alternating current (AC) and direct current (DC) electric field. Besides that, it is demonstrated about the insulator deterioration under both electric field stressed due to an ageing and partial discharge (PD) phenomenon. The vital parameters factors are water droplets conductivity, droplet volume, surface roughness and droplet positioning that they cause to occur the electric field intensification. The field is intensified at the interface between the droplet, air and insulating material. Thus, the PD occurred d

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4

Jörgens, Christoph, and Markus Clemens. "Electric Field and Temperature Simulations of High-Voltage Direct Current Cables Considering the Soil Environment." Energies 14, no. 16 (2021): 4910. http://dx.doi.org/10.3390/en14164910.

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For long distance electric power transport, high-voltage direct current (HVDC) cable systems are a commonly used solution. Space charges accumulate in the HVDC cable insulations due to the applied voltage and the nonlinear electric conductivity of the insulation material. The resulting electric field depends on the material parameters of the surrounding soil environment that may differ locally and have an influence on the temperature distribution in the cable and the environment. To use the radial symmetry of the cable geometry, typical electric field simulations neglect the influence of the s

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5

Xia, Rong. "Characteristic Analysis and Measurement of Dielectric Loss in Non-Linear Insulating Materials." Advanced Materials Research 986-987 (July 2014): 1471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1471.

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Non-linear insulating material is widely used in the insulations of XLPE cable terminations and stator windings insulation of electric machines, and has obvious capability to improve the distribution of electric field. Actually, the dielectric loss factor of non-linear insulating materials is not equal to the tanδ describing linear insulating materials, and depends on applied voltage and their structures. This paper firstly discusses the difference between ac loss characteristic of non-linear dielectrics and linear dielectrics and presents a kind model of non-linear composite material. Based o

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6

Jörgens, Christoph, and Markus Clemens. "Modeling the electric field at interfaces and surfaces in high-voltage cable systems." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 5 (2020): 1099–111. http://dx.doi.org/10.1108/compel-01-2020-0041.

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Purpose In high-voltage direct current (HVDC) cable systems, space charges accumulate because of the constant applied voltage and the nonlinear electric conductivity of the insulating material. The change in the charge distribution results in a slowly time-varying electric field. Space charges accumulate within the insulation bulk and at interfaces. With an operation time of several years of HVDC systems, typically the stationary electric field is of interest. The purpose of this study is to investigate the influence of interfaces on the stationary electric field stress and space charge densit

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7

Zeng, Zhou, Pan Guo, Ruoshuang Zhang, et al. "Review of Aging Evaluation Methods for Silicone Rubber Composite Insulators." Polymers 15, no. 5 (2023): 1141. http://dx.doi.org/10.3390/polym15051141.

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Silicone rubber insulation material is widely used for the external insulation of power systems. During the continuous service of a power grid, it will be seriously aged due to the influence of high voltage electric fields and harsh climate environments, which will reduce its insulation performance and service life and cause transmission line failure. How to evaluate the aging performance of silicone rubber insulation materials scientifically and accurately is a hot and difficult issue in the industry. Starting from the composite insulator, which is the most widely used insulating device of si

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8

Ersoy, Aysel, Fatih Atalar, and Alper Aydoğan. "Investigation of Novel Solid Dielectric Material for Transformer Windings." Polymers 15, no. 24 (2023): 4671. http://dx.doi.org/10.3390/polym15244671.

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Improvement techniques aimed at enhancing the dielectric strength and minimizing the dielectric loss of insulation materials have piqued the interest of many researchers. It is worth noting that the electrical breakdown traits of insulation material are determined by their electrochemical and mechanical performance. Possible good mechanical, electrical, and chemical properties of new materials are considered during the generation process. Thermoplastic polyurethane (TPU) is often used as a high-voltage insulator due to its favorable mechanical properties, high insulation resistance, lightweigh

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9

Decner, Adam, Marcin Baranski, Tomasz Jarek, and Sebastian Berhausen. "Methods of Diagnosing the Insulation of Electric Machines Windings." Energies 15, no. 22 (2022): 8465. http://dx.doi.org/10.3390/en15228465.

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The presented article concerns issues related to the diagnostics of the technical condition of the insulation of electrical machines. It discusses the importance of the operational supervision, maintenance and diagnostics of electrical machine insulation systems. The structure of the insulation system is presented and known solutions for making winding insulation are described. The negative impact of conditions and various exposures on the technical condition of the insulation system is described. Special attention is focused on the review of available diagnostic methods for insulating systems

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10

Li, Yu Mei, Tao Ding, and Zong Tao Chen. "Structural Optimization and Electric Field Analysis on the Insulation Structure of UHDV Wall Bushing." Advanced Materials Research 732-733 (August 2013): 1052–55. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1052.

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The insulation mechanism of UHVDC wall bushing is discussed. Design solution of the insulation structure is determined. In the solution, internal insulation includes SF6 gas-insulated and shielding structure, and external insulation is a type of composite insulating material, which is made up of epoxy FRP pipe and silicone rubber sheds. Creepage distance of external insulation and two types of shielding structures are designed in the paper. Finally two types of shielding structure are compared and optimized based on electric field simulation, and the result shows that dual-plate grounded shiel

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11

Hao, JinPeng, ShiTao Liu, Kai Yang, Hong Wu, BoYu Zhang, and ZhiYong Xiao. "the Technology of Space Electric Field Detection of Deteriorated Insulator Strings Based on Multi Rotor UAV." Journal of Physics: Conference Series 2215, no. 1 (2022): 012022. http://dx.doi.org/10.1088/1742-6596/2215/1/012022.

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Abstract Porcelain insulator with good insulation performance is the key to the stable operation of power system. In order to characterize its insulation performance safely and accurately, a 1:1 three-dimensional electric field simulation model of 220 kV porcelain tension insulator string is established by using COMSOL finite element software, and a UAV live detection platform for degraded insulator string is built according to the optical electric field sensor. The results show that when the insulator deteriorates, the distribution electric field curve will appear obvious distortion; comparin

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12

Leonov, A. P., and A. Supueva. "PROVIDING A MINIMUM DEFECTIVENESS OF INTER-TURN INSULATION AT THE MANUFACTURING STAGE AND DURING THE EXPLOITATION." Resource-Efficient Technologies, no. 1 (October 12, 2022): 1–9. http://dx.doi.org/10.18799/24056529/2022/1/320.

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The reliability of a low-voltage asynchronous electric motor is primarily determined by the reliability of the stator winding insulation. Common reasons for the failure of the insulation system are the unsatisfactory quality of the enameled wires and electrical insulating materials used for imperfection and violation of the technological process of winding and insulating work, and the discrepancy between operating modes. In the vast majority of cases, failures occur due to damage to the inter-turn insulation as the weakest element. This causes the need to study the insulation system resistance

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13

Baek, Lee, and Kim. "Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load." Applied Sciences 9, no. 20 (2019): 4207. http://dx.doi.org/10.3390/app9204207.

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In electric vehicles (EVs), the use of high-temperature heat transfer components that effectively block external heat and minimize cooling losses can increase vehicle mileage during heating/cooling operations and improve passenger comfort. In particular, in ensuring high thermal insulation, the car headliner forms an important component for effectively managing environmental heat energy and heating and cooling processes inside the EV. In this study, we have proposed and experimentally verified the use and efficacy of vacuum insulation material in the headliner of EVs to reduce the heat load. T

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14

Yashchenko, Sergey, and Dmitry Luchko. "The dependence of the air permeability of glass-mica tapes on the technology of production." Energy Systems 7, no. 3 (2022): 63–69. http://dx.doi.org/10.34031/es.2022.3.007.

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The main part of technological processes in almost all industries, including those related to transportation, processing of mineral raw materials, cannot be implemented without the use of electric motors. The high reliability of these machines ensures trouble-free operation and guarantees the safety of people in these industries. The reliability indicators of electric machines depend on the insulation condition of the windings, which is largely determined by the saturation of the winding cavities with the impregnating compound that penetrated them during impregnation. Various manufacturing tec

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15

Pak, V. M. "Electric insulation technique." Russian Electrical Engineering 78, no. 3 (2007): 107–8. http://dx.doi.org/10.3103/s1068371207030017.

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16

Pak, V. M., G. P. Safonov, A. V. Papkov, and P. V. Vorobyov. "Prospective electric insulation materials for insulation systems of electric machines." Russian Electrical Engineering 82, no. 4 (2011): 194–96. http://dx.doi.org/10.3103/s1068371211040122.

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17

Xing, Zhaoliang, Hao Ge, Fanqiu Zeng, Shaowei Guo, and Chunjia Gao. "Kerr Electro-Optic Effect-Based Methodology for Measuring and Analyzing Electric Field Distribution in Oil-Immersed Capacitors." Energies 17, no. 13 (2024): 3139. http://dx.doi.org/10.3390/en17133139.

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In the current design and verification processes of insulation structures for high-voltage oil-immersed capacitors, there is a heavy reliance on electric field simulation calculations using idealized models that lack empirical validation of spatial electric fields. This study employs the Kerr electro-optic effect to establish a non-contact optical remote sensing system for measuring the spatial electric field distribution in the insulating liquid dielectric (benzyltoluene) between the capacitor’s element and the case under various temperatures and main insulation distances. The findings reveal

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18

He, Jiahong, Weilun Xu, and Bingtuan Gao. "Self-Insulating Joint Design for Live-Line Operation Based on the Cable-Driven Parallel-Series Mechanism." Applied Sciences 10, no. 1 (2019): 22. http://dx.doi.org/10.3390/app10010022.

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This paper proposes a self-insulating joint design based on the cable-driven parallel-series (CDPS) mechanism and electrical insulation analysis. The design provides the motions, mechanic support, and electrical insulation for robotic arms in live-line operation, which can maintain the equipment without manual intervention and power interruption. This CDPS mechanism can integrate four degrees of freedom (DOFs) motion in one joint, while the traditional series joint can only realize one DOF independently. The cable forces in the CDPS are calculated by the inverse kinematics to ensure the safe a

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19

Bashirov, M., A. Nemirovskiy, A. Aluynov, O. Vyatkina, and R. Salikhova. "Destruction of electrical insulating structures of electric motors during various drying techniques." E3S Web of Conferences 220 (2020): 01066. http://dx.doi.org/10.1051/e3sconf/202022001066.

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The paper discusses the problem of drying electric motors in a humid environment. The study considers the influence of oven, current, electroosmotic, convective-electroosmotic drying methods on defect formation in electrical insulating materials of electric motors. Thermal oven drying destroys the insulation system of electric motors for an order of magnitude higher than other methods and has a lot of negative consequences. The electroosmotic and convective-electroosmotic drying processes do not have disadvantages of thermal drying methods, or these disadvantages are kept to a minimum. It is s

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20

Diban, Bassel, and Giovanni Mazzanti. "The Effect of Insulation Characteristics on Thermal Instability in HVDC Extruded Cables." Energies 14, no. 3 (2021): 550. http://dx.doi.org/10.3390/en14030550.

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This paper aims at studying the effect of cable characteristics on the thermal instability of 320 kV and 500 kV Cross-Linked Polyethylene XLPE-insulated high voltage direct-current (HVDC) cables buried in soil for different values of the applied voltages, by the means of sensitivity analysis of the insulation losses to the electrical conductivity coefficients of temperature and electric field, a and b. It also finds the value of dielectric loss coefficient βd for DC cables, which allows an analytical calculation of the temperature rise as a function of insulation losses and thermal resistances

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21

Shrayber, Marina. "Investigation of Fatigue Aging of Insulation of Traction Electric Motors of Diesel Locomotives Under Cyclic Load." Bulletin of scientific research results 2023, no. 4 (2023): 27–35. http://dx.doi.org/10.20295/2223-9987-2023-4-27-35.

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Purpose: To analyze the processes of fatigue aging of the insulation of traction electric machines of locomotives under cyclic loads in operation. Methods: When solving typical problems of fatigue strength of insulating materials of electric locomotives, periodic loading cycles are used in the study. Results: The analysis of the processes of fatigue aging of insulation materials of electrical machines shows that the main parameters that increase the intensity of aging are the frequency and amplitude of the heating cycle. Thermomechanical stresses increase with rise of heating speed and tempera

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22

Cambareri, Pasquale, Carlo de Falco, Luca Di Rienzo, Paolo Seri, and Gian Carlo Montanari. "Simulation and Modelling of Transient Electric Fields in HVDC Insulation Systems Based on Polarization Current Measurements." Energies 14, no. 24 (2021): 8323. http://dx.doi.org/10.3390/en14248323.

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Simulating and modelling electric field dynamics in the insulation of medium- and high-voltage DC electrical systems is needed to support insulation design optimization and to evaluate the impact of voltage transients on ageing mechanisms and insulation reliability. In order to perform accurate simulations, appropriate physical models must be adopted for the insulating material properties, particularly conductivity, which drives the electric field in a steady-state condition and contributes to determining the field behavior during voltage and load transients. In order to model insulation condu

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23

Kiselev, V. I., T. O. Vakhromeeva, and A. I. Fedyanin. "Increasing reliability of traction electric motors of diesel locomotives taking into account thermophysical parameters of insulation and armature winding conductors." RUSSIAN RAILWAY SCIENCE JOURNAL 81, no. 3 (2022): 213–20. http://dx.doi.org/10.21780/2223-9731-2022-81-3-213-220.

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Introduction. The issue of ensuring the operable state of the DC traction motor is relevant due to its large-scale use on diesel locomotives, including modern powerful motors, operating on lines with increased train masses. At present, a rather difficult situation has developed in the locomotive industry with the failure of diesel locomotive traction electric motors due to a decrease in the insulation resistance of the armature windings of the electric motors and their subsequent breakdowns: up to 28 % of the total number of failures of electric motors are due to breakdown of the hull insulati

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24

Florkowski, Marek. "Comparison of Effects of Partial Discharge Echo in Various High-Voltage Insulation Systems." Energies 17, no. 20 (2024): 5114. http://dx.doi.org/10.3390/en17205114.

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In this article, an extension of a conventional partial discharge (PD) approach called partial discharge echo (PDE), which is applied to different classes of electrical insulation systems of power devices, is presented. Currently, high-voltage (HV) electrical insulation is attributed not only to transmission and distribution grids but also to the industrial environment and emerging segments such as transportation electrification, i.e., electric vehicles, more-electric aircraft, and propulsion in maritime vehicles. This novel PDE methodology extends the conventional and established PD-based ass

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25

Wei, Binbin, Zhijuan Wang, Runze Qi, Xiaolong Wang, and Tong Zhao. "A Study on the Motion Behavior of Metallic Contaminant Particles in Transformer Insulation Oil under Multiphysical Fields." Sensors 24, no. 17 (2024): 5483. http://dx.doi.org/10.3390/s24175483.

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When using transformer insulation oil as a liquid dielectric, the oil is easily polluted by the solid particles generated in the operation of the transformer, and these metallic impurity particles have a significant impact on the insulation performance inside the power transformer. The force of the metal particles suspended in the flow insulation oil is multidimensional, which will lead to a change in the movement characteristics of the metal particles. Based on this, this study explored the motion rules of suspended metallic impurity particles in mobile insulating oil in different electric fi

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26

Zou, Huanqing, Yufeng Yin, Juan Chen, Shun Zhang, and Fuqiang Tian. "Research on the Inner Surface Discharge of the Insulation Sheath of Electric Locomotive Cable Terminals." Applied Sciences 14, no. 21 (2024): 9681. http://dx.doi.org/10.3390/app14219681.

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Adding an insulating sheath to the exposed metal part of the outer insulation of a roof cable terminal can extend the creepage distance of the leakage current and significantly reduce the probability of pollution flashover on the outer insulation of the equipment. However, during the actual operation of the locomotive, the inner surface of the insulating sheath is discharged, resulting in cable insulation breakdown, the mechanism of which is unclear. This paper establishes a cable terminal–sheath electric field simulation model and studies the interface air gap, the interface with wet pollutio

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27

Hogenes, Annemiek M., Cornelis H. Slump, Gerben A. te Riet o. g. Scholten, Martijn W. J. Stommel, Jurgen J. Fütterer, and Rudolf M. Verdaasdonk. "The Effect of Partial Electrical Insulation of the Tip and Active Needle Length of Monopolar Irreversible Electroporation Electrodes on the Electric Field Line Pattern and Temperature Gradient to Improve Treatment Control." Cancers 15, no. 17 (2023): 4280. http://dx.doi.org/10.3390/cancers15174280.

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Unintentional local temperature effects can occur during irreversible electroporation (IRE) treatment, especially near the electrodes, and most frequently near the tip. Partial electrical insulation of the IRE electrodes could possibly control these temperature effects. This study investigated and visualized the effect of partial electrical insulation applied to the IRE electrodes on the electric field line pattern and temperature gradient. Six designs of (partial) electrical insulation of the electrode tip and/or active needle length (ANL) of the original monopolar 19G IRE electrodes were inv

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28

Papkov, A. V., A. P. Mel’nichenko, V. M. Pak, and I. E. Kuimov. "Modern electric insulating materials for the insulation systems of rotating electric machines." Russian Electrical Engineering 80, no. 3 (2009): 123–27. http://dx.doi.org/10.3103/s1068371209030018.

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29

Lukashov, Nikolay, Vitaly Suslov, Artem Masonov, Oleg Magankov, and Sergey Sergeev. "IMPROVING THE INSULATION RELIABILITY OF THE TRACTION ASYNCHRONOUS MOTOR OF A LOCOMOTIVE BY OPTIMIZING ITS DESIGN PARAMETERS." Transport engineering 2025, no. 5 (2025): 57–62. https://doi.org/10.30987/2782-5957-2025-5-57-62.

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Traction asynchronous electric motors (TAEM) have a key place among locomotive electric drives, ensuring the reliability and efficiency of railway transportation. During TAEM operation, their insulation materials can be exposed to various influences, which lead to aging, degradation and, eventually, to possible emergency situations. In this regard, the assessment of the insulation condition of the rods of the traction asynchronous electric motor of a locomotive with different sections of the rotor windings is an urgent task. A study of the condition of TAEM insulation coatings and the determin

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30

Dubravin, Yuriy, Yaroslav Shostak, Vitaly Bakhonya, and Viktor Tkachenko. "Justification of choice of methods for diagnostics of insulation condition of electrical machines of electric railway stock." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", no. 43 (June 18, 2024): 76–89. http://dx.doi.org/10.32703/2617-9059-2024-43-6.

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The object of the study is the process of monitoring the technical condition of electrical insulation of traction electric machines in order to determine the need for their maintenance or repair. Diagnostics of electric machines is an important aspect of supporting the operation of electric drives. Failure of the windings is one of the main reasons for failure of electric motors. Therefore, the task of developing operational methods for diagnosing the insulation of windings of traction electric motors is urgent. A study of the negative impact of operating conditions on the technical condition

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31

Kovalev, D. I., E. M. Voronkova, and D. V. Golubev. "Evaluation of the dielectric strength of the insulation of innovative busbar conductors with a voltage class of 6 (10) kV." IOP Conference Series: Earth and Environmental Science 990, no. 1 (2022): 012047. http://dx.doi.org/10.1088/1755-1315/990/1/012047.

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Abstract The article discusses the issue of increasing the dielectric strength of solid insulation of conduits used in various areas of the electric power industry, chemical and metallurgical industries, as well as in the agro-industrial complex. For a conductor with a voltage class of 6 (10) kV with a specially developed new type of insulating compound, electric strength tests were carried out with a full lightning impulse and one-minute power frequency voltage. As a result of the tests carried out, the functionality of the improved design and the new type of insulation was confirmed.

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Deng, Jun, Chunjia Gao, Zhicheng Xie, et al. "Electric Field Features and Charge Behavior in Oil-Pressboard Composite Insulation under Impulse Voltage." Energies 17, no. 19 (2024): 4903. http://dx.doi.org/10.3390/en17194903.

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Oil-pressboard/paper insulation materials are essential in transformers for ensuring their safe and stable operation, primarily due to their roles in spatial electric field distribution and charge migration mechanisms. Current spatial distribution analyses rely on computational methods that lack empirical validation, particularly for oil-pressboard/paper composites. This study leverages the principles of the Kerr electro-optic effect to develop a rapid measurement platform for electric fields within oil-pressboard/paper insulation under impulse voltage conditions, which measures the spatial el

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Arsenyev, Dmitry, Simon Dubitsky, Dmitry Kiesewetter, and Victor Malyuin. "Numerical Simulation and Calculation of Resistance of Laminated Paper-Impregnated Insulation of Power Cables." Energies 15, no. 19 (2022): 7403. http://dx.doi.org/10.3390/en15197403.

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Numerical simulation of polypropylene laminated paper insulation is a serious challenge, as it must take into account the layered structure and presence of longitudinal and radial gaps in the coils of the winded tape for cables with sector-shape conductive cores. Thus far, it has been performed only with serious simplifications. We propose a technique for numerical modeling of electric parameters in this type of insulation by reducing a complex 3D problem to a simplified 2D model that takes into account the main influencing factors. The results of modeling the distribution of electric field st

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34

Papkov, Andrey, and Dmitry Luchko. "RESULTS OF COMPARATIVE RESOURCE TESTS OF INSULATION SYSTEMS OF HEAT RESISTANCE CLASS H (180°C) OF TRACTION ENGINES OF ELECTRIC LOCOMOTIVES USING POLYESTHERKETONE AND POLYIMIDE FILMS." Energy Systems 8, no. 2 (2023): 51–59. http://dx.doi.org/10.34031/es.2023.2.006.

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The operation of electric locomotive traction motors in conditions of constantly increasing temperature and humidity naturally leads to a decrease in the resistance of the body insulation of the coils of the main and auxiliary poles, which then leads to insulation breakdown and engine failure. In the general statistics on TED breakdowns, the percentage of failure due to low insulation resistance is up to 30%. Manufacturers of electrical insulation are constantly working to increase its reliability, using modern systems of polymer materials for this purpose. This article provides a brief

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35

Starikova, Nadezda S., Vitaly V. Redko, and G. V. Vavilova. "Comparison of Cable Insulation Control in Weak and Strong Electric Fields." Applied Mechanics and Materials 756 (April 2015): 486–90. http://dx.doi.org/10.4028/www.scientific.net/amm.756.486.

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In this paper the modern methods of cable products insulation control are referred. A comparison of efficiency of the cable insulation defects control by changing in cable area capacitance is carried out in the strong and weak electric fields. The electric cable can be represented as a cylindrical capacitor, but to simplify the issue the insulation area is represented as a plate capacitor with anisotropic dielectric. The cable insulation model is created in the software Comsol Multyphysic. The effect of the defect dimension on the cable area electric capacitance in a strong and weak electric f

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36

Kashin, A. I., and A. E. Nemirovsky. "Analysis of depolymerization of insulating compositions of electric motor windings based on ultrasonic radiation." Vestnik MGTU 24, no. 4 (2021): 361–71. http://dx.doi.org/10.21443/1560-9278-2021-24-4-361-371.

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This work is a continuation of the fundamental study on implementing an innovative method of repairing electric motors using ultrasound. A study of the method of dismantling windings based on ultrasound has been carried out for the purpose of energy efficiency, environmental friendliness and less time spent on the repair cycle of electric motors in terms of removing the stator winding. The investigated dismantling method is optimal for a number of technical issues in comparison with the existing methods for dismantling electric motor windings. In the work, the main focus is on the material of

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37

Gao, You Hua, Fei Liu, and You Feng Gao. "Influence on Electric Field Distribution of GIS Basin Insulator for Insulated Material Epoxy Resin with Different Mean Molecular Weights." Applied Mechanics and Materials 130-134 (October 2011): 19–22. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.19.

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The insulation material epoxy resin mean molecular weight to its solidification electrical performance influence is discussed. In view of the bisphenol A epoxy resin with different mean molecular weights, Finite Element Method (FEM) are introduced and electric field calculation equations are established to calculate the field distribution of basin insulator and its around region in GIS. Representative potential distribution curves are shown. The tangential and normal electric filed intensity maximum of basin insulator is calculated. The positions of electric field intensity maximum are also gi

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38

Eze, A. H., and Á. Lakatos. "Applications of thermal insulation materials by aircraft." Journal of Physics: Conference Series 2628, no. 1 (2023): 012018. http://dx.doi.org/10.1088/1742-6596/2628/1/012018.

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Abstract Lightweight materials such as microfiber insulation or polymer foam are typically used to insulate cars and aircraft. But here, too, the use of state-of-the-art “super-insulating” materials is a valid answer. Vacuum insulation panels also serve as reliable insulators for electric vehicles. In this study, we will analyze in depth the potential uses for aerogels, polymer foams, and microfiber insulation. In addition, their thermal properties are briefly outlined, with a special focus on thermal conductivity and compressibility. Finding the right solution for the aircraft industry is cri

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Yao, Wei, Zhengyong Huang, Jian Li, Liya Wu, and Chenmeng Xiang. "Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids." Journal of Nanomaterials 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/4504208.

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Nanoparticles enhance the electrical insulation and thermal properties of vegetable oil, and such improvements are desirable for its application as an alternative to traditional insulating oil for power transformers. However, the traditional method of insulating nanofluids typically achieves high electrical insulation but low thermal conductivity. This work reports an environmentally friendly vegetable oil using exfoliated hexagonal boron nitride (h-BN) showing high thermal conductivity and high electrical insulation. Stable nanofluids were prepared by liquid exfoliation of h-BN in isopropyl a

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Thabet, Ahmed, Youssef Mobarak, Nourhan Salem, and A. M. El-noby. "Performance comparison of selection nanoparticles for insulation of three core belted power cables." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 3 (2020): 2779. http://dx.doi.org/10.11591/ijece.v10i3.pp2779-2786.

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This paper presents an investigation on the enhancement of electrical insulations of power cables materials using a new multi-nanoparticles technique. It has been studied the effect of adding specified types and concentrations of nanoparticles to polymeric materials such as PVC for controlling on electric and dielectric performance. Prediction of effective dielectric constant has been done for the new nanocomposites based on Interphase Power Law (IPL) model. The multi-nanoparticles technique has been succeeded for enhancing electric and dielectric performance of power cables insulation compare

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Ahmed, Thabet, Mobarak Youssef, Salem Nourhan, and M. El-noby A. "Performance comparison of selection nanoparticles for insulation of three core belted power cables." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 3 (2020): 2779–86. https://doi.org/10.11591/ijece.v10i3.pp2779-2786.

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This paper presents an investigation on the enhancement of electrical insulations of power cables materials using a new multi-nanoparticles technique. It has been studied the effect of adding specified types and concentrations of nanoparticles to polymeric materials such as PVC for controlling on electric and dielectric performance. Prediction of effective dielectric constant has been done for the new nanocomposites based on Interphase Power Law (IPL) model. The multi-nanoparticles technique has been succeeded for enhancing electric and dielectric performance of power cables insulation compare

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Ndoumbe, Jean, Emeric Tchamdjio Nkouetcha, and Jean Gabriel Ologo Emboueme. "FEM Analysis of the Electric Field and Potential of Various Types of Insulators under Uniform Pollution." International Journal of Research and Review 10, no. 8 (2023): 1061–68. http://dx.doi.org/10.52403/ijrr.202308134.

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This work aims to present an analysis of the behaviour of the electric field and the potential for three different types of insulators, the glass, the porcelain and the polymeric. Since pollution is an important factor for their insulation performance and reliability in high-voltage systems, it is essential to understand how a uniform pollution layer could influence the distribution of the field and the electric potential for each of these insulators. For this purpose, COMSOL Multiphysics was used to study these distributions in both clean and polluted conditions, using the finite element meth

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Kucheriava, I. M. "ELECTRIC FIELD ENHANCEMENT IN POLYETHYLENE CABLE INSULATION WITH DEFECTS." Tekhnichna Elektrodynamika 2018, no. 2 (2018): 11–16. http://dx.doi.org/10.15407/techned2018.02.011.

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Wang, Ya, Yifei Xiong, Zheming Wang, and Wu Lu. "Characterization of Space Charge Accumulations in Alternative Gas-to-Liquid Oil-Immersed Paper Insulation Under Polarity Reversal Voltage Scenarios." Energies 18, no. 12 (2025): 3152. https://doi.org/10.3390/en18123152.

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Due to its advantages, such as its corrosive sulfur-free property and high purity, gas-to-liquid (GTL) oil is regarded as an excellent alternative to conventional naphthenic mineral oil in the oil/paper composite insulation of UHV converter transformers. In such application scenarios, under the condition of voltage polarity reversal, charge accumulation is likely to occur along the liquid/solid interface, which leads to the distortion of the electric field, consequently reducing the breakdown voltage of the insulating material, and leading to flashover in the worst case. Therefore, understandi

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Zhang, Shuqi, Xinru Yu, Chao Wu, Lijun Yang, Huanchao Cheng, and Junyu Deng. "Study on surface discharge characteristics and design method of large size oil-paper insulation of electrical transformer." Journal of Physics: Conference Series 2355, no. 1 (2022): 012065. http://dx.doi.org/10.1088/1742-6596/2355/1/012065.

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Abstract When partial discharge occurs in the power transformer, the arc can further develop on the oil-paper interface between high and low potentials, and then form a path, resulting in large-area flashover. This will lead to a wide range of insulation damage, insulation failure, equipment shutdown and even large-scale economic losses. For the insulation damage caused by surface discharge of oil paper insulation, relevant scientific research institutions have carried out a large number of experimental studies. However, limited by the test conditions, the research focuses on the small-size mo

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Yu, Yong Peng. "Development Strategy of Insulation Macromolecular Composite Materials." Advanced Materials Research 391-392 (December 2011): 328–31. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.328.

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The status and progress of high pressure resistant insulation material at home and abroad were reviewed from aspects like high thermal conductivity, high temperature resistance, environ-mental protection and modification of nano-particles. High thermal conductivity insulation materials can improve the efficiency of cooling system and decrease the energy loss of electric machines. Some famous foreign companies keep ahead in this field. Current domestic high temperature resistant solvent less insulating varnish can only be used in small and medium sized generators instead of high voltage generat

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Yang, Zhifei, Zhiye Du, Jiangjun Ruan, et al. "Simulation on motion characteristics of space charge in single oil-paper insulation." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 6 (2017): 1663–75. http://dx.doi.org/10.1108/compel-12-2016-0564.

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Purpose The purpose of this paper is numerical calculation of total electric field in oil-paper insulation. Now, there is no effective method to consider the influence of space charges when calculating the total electric field distribution in the main insulation system of the valve-side winding of an ultra-high-voltage direct current converter transformer. Design/methodology/approach To calculate the total electric field in an oil-paper insulation system, a new simulation method in single-layer oil-paper insulation based on the transient upstream finite element method (TUFEM) is proposed, in w

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Teregulov, O. A. "New Approaches to Assessing State of Insulating Material of Traction Electric Motors of Electric Locomotives." World of Transport and Transportation 18, no. 2 (2020): 102–15. http://dx.doi.org/10.30932/1992-3252-2020-18-102-115.

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Increasing the efficiency of functioning of railway transport in the field of cargo and passenger transportation, reducing operating costs are immediately related at present to the cost of maintaining and restoring traction rolling stock. Optimization of operating costs is possible on the basis of the transition from a scheduled preventive system of repair of traction rolling stock, based on assessment of the average statistical level of its technical condition without considering peculiarities of the operating range, to a system of repair and maintenance based on the actual technical conditio

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Vu, Thi Thu Nga, Gilbert Teyssedre, and Séverine Le Roy. "Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions." Energies 14, no. 17 (2021): 5401. http://dx.doi.org/10.3390/en14175401.

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Accessories such as joints and terminations represent weak points in HVDC cable systems. The DC field distribution is intimately dependent on the thermal conditions of the accessory and on material properties. Moreover, there is no available method to probe charge distribution in these conditions. In this work, the field distribution in non-stationary conditions, both thermally and electrically, is computed considering crosslinked polyethylene (XLPE) as cable insulation and different insulating materials (silicone, rubber, XLPE) for a 200 kV joint assembled in a same geometry. In the condition

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Florkowski, Marek, Barbara Florkowska, and Pawel Zydron. "Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation." Energies 12, no. 5 (2019): 768. http://dx.doi.org/10.3390/en12050768.

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Power electronics switching devices currently represent the dominant technology for supplying low voltage (LV) electric motors. The fast switching processes exert a different class of stress on dielectric insulating materials than standard sinusoidal excitations. Such stresses result in an increase in the dynamic activity of the working electric field, which in turn lead to an increased likelihood of partial discharges (PD). The stator design of low voltage motor is often in form of random-wound windings, where the magnet wires (copper or aluminum round wires coated with thin layer of insulati

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