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Artigos de revistas sobre o tema "Electric lines"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 9 de junho de 2025

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1

ARRIBAS, E., C. GALLARDO, M. MOLINA, and V. SANJOSÉ. "Electric Field Lines." International Journal of Modern Physics C 02, no. 01 (March 1991): 216–19. http://dx.doi.org/10.1142/s0129183191000196.

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We present the computer program called LINES which is able to calculate and visualize the electric field lines due to seven different discrete configurations of electric point charges. Also we show two examples of the graphic screens generated by LINES.

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2

MAMADA, Yasuhiro, Seiji HAYANO, Yoshifuru SAITO, and Kiyoshi HORII. "Electric Power lines Visualization." Journal of the Visualization Society of Japan 25, Supplement1 (2005): 173–76. http://dx.doi.org/10.3154/jvs.25.supplement1_173.

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3

Jiang, Yu Ze, Zhen Guang Liang, Wei Jie Ma, and Hong Chuan Wang. "Effect of Shielding Lines on Power Frequency Electric Field under Overhead Lines." Advanced Materials Research 732-733 (August 2013): 999–1004. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.999.

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This paper discusses effect of shielding lines on reduction of electric field produced by overhead lines. Charge simulation method is used. Influences of height, space and number of shielding lines on electric field are calculated. Space between shielding lines has reverse roles on influencing area and maximal electric field. Number and space of shielding lines should be carefully selected to shielding a certain area. Analytical method is also used to express induced electric field by shielding lines. Result of comparison with charge simulation method shows that it is suitable for area outside of three phase lines.

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4

Robinson, P. B. "Communicating over electric distribution lines." IEEE Potentials 9, no. 3 (October 1990): 36–39. http://dx.doi.org/10.1109/45.101399.

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5

Wang, Ziyu, Nana Duan, Junyu Chen, Xikun Zhou, Mengxue Lu, and Shichen Zhao. "Effect of Tree Quantity and Distribution on the Electric Field under Transmission Lines." Applied Sciences 14, no. 18 (September 20, 2024): 8487. http://dx.doi.org/10.3390/app14188487.

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The electric field of transmission lines has serious negative impacts on residents’ production and life with the expansion of high voltage engineering. In order to study the influence of trees on the electric field of ultra-high voltage transmission lines, this paper conducted three-dimensional simulation calculations of the power frequency electric field of transmission lines based on the tree quantity and distribution. Firstly, in order to study the pattern of electric field strength distribution in transmission lines, the electric field strengths of transmission lines of different voltage levels were compared; the maximum-power-frequency electric field intensity of ultra-high voltage transmission lines occurs below the edge conductor. Secondly, by changing the number of trees, it was concluded that the electric field strength below the edge conductor gradually decreases with the number of trees. Finally, the maximum electric field strength value at 1.5 m below the edge conductor and the width of the transmission corridor decreased by changing the layout of the trees. The results show that studying the impact of a tree’s electromagnetic parameters on the power frequency electric field strength under transmission lines can help reduce the electric field strength and decrease the width of transmission corridors, which is of great significance for line design and cost savings.

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6

Lacombe, Rémi, Sébastien Gros, Nikolce Murgovski, and Balázs Kulcsár. "Hierarchical Control of Electric Bus Lines." IFAC-PapersOnLine 53, no. 2 (2020): 14179–84. http://dx.doi.org/10.1016/j.ifacol.2020.12.1040.

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7

Colwell, Peter F., and Jim L. Sanders. "Electric Transmission Lines and Farmland Value." Journal of Real Estate Research 39, no. 3 (July 1, 2017): 373–400. http://dx.doi.org/10.1080/10835547.2017.12091478.

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8

Sugar, Jack, Joseph Reader, and William L. Rowan. "Electric-quadrupole lines of Mo xvi." Physical Review A 51, no. 1 (January 1, 1995): 835–37. http://dx.doi.org/10.1103/physreva.51.835.

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9

Kirkup, L. "Computer simulation of electric field lines." Physics Education 20, no. 3 (May 1, 1985): 142–45. http://dx.doi.org/10.1088/0031-9120/20/3/314.

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10

Predus, Marius-Florian, Cristian-Mircea Muscai, and Cornel Hatiegan. "Simulation of electric field lines produced by electric point charges." Studia Universitatis Babeș-Bolyai Engineering 67, no. 1 (November 11, 2022): 209–15. http://dx.doi.org/10.24193/subbeng.2022.1.20.

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The paper proposes o method of solving differential equations using Runge-Kutta method and presents an application made in a Visual programming language that solves two differential equations step by step drawing the graph obtained for two electrically charged particles that interact by their electrical fields

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11

Yang, Yi, Xue-kai Si Ma, Shu-bo Fang, Qing Han, and Zan-dong Zhou. "Analysis of monitoring effect on Hybrid Electric Field for AC/DC Cross Line." Journal of Physics: Conference Series 2378, no. 1 (December 1, 2022): 012018. http://dx.doi.org/10.1088/1742-6596/2378/1/012018.

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Abstract Electrostatic induction charge which generated by the coupling effect of hybrid electric field of AC/DC cross line and metal object under the transmission line can cause different levels of electric shock injury to human. In order to find out the distribution law of the hybrid electric field and reduce the effect of electrostatic induction, this paper set up shielding lines which paralleled to the AC and DC lines respectively on the outside of the side conductors and along the diagonal of parallelogram at crossing point, then measured the electric field distribution in shielding areas of 750kV AC and 500kV DC lines and the induced voltages of shielding lines in different states, analyzed the effect of shielding line on power frequency electric field and DC composite electric field. The results showed that shielding lines have a reducing effect on the hybrid electric field of the cross lines, the average power frequency field strength is reduced by 12.6%, the DC composite field and power frequency electric field at the crossing position was far less than the limits specified in the respective standards. Both induced voltage of bare lines and shielding lines wrapped with adhesive tape increase with the raise of erection height. Under the same conditions, the average induction voltage of bare conductor is 9.3% higher than that of shielding lines wrapped with adhesive tape. There is no obvious difference between parallel and vertical erection methods of the same number of shielding lines in the degree of reduction of induced voltage.

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12

Lee, Gunbok, Jeong-Yeon Kim, Gildong Kim, and Jae Hee Kim. "Surface-Integrated Electric Field Sensor for the Detection of High-Voltage Power Lines." Sensors 21, no. 24 (December 13, 2021): 8327. http://dx.doi.org/10.3390/s21248327.

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When a drone is used for inspection of facilities, there are often cases in which high-voltage power lines interfere, resulting in the drone being caught or falling. To prevent this type of incident, drones must be capable of detecting high-voltage power lines. Typically, a strong electric field is formed around the high-voltage lines. To detect the electric fields around high-voltage lines, this study proposes an electric field sensor that may be integrated within the body of a drone. In a laboratory environment, a voltage of 25 kV was applied to an overhead line, and the induced voltage in the proposed sensor was measured at various electric field intensities. Over an electric field range of 0.5 to 10.1 kV/m, a voltage of 0 to 0.77 V was measured with each proposed sensor. In addition, the electric field and the voltage induced in the sensor were measured in a real-world railway environment with overhead lines. Under these conditions, the proposed sensor has the compensated value of 4.5 when the measured electric field was 4.05 kV/m. Therefore, the proposed sensor may be applied in drones to measure large electric fields and to detect the presence of high-voltage lines in its vicinity.

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13

Watkins, Noel. "Raptors and Power Lines." Wildlife Rehabilitation Bulletin 22, no. 2 (December 31, 2004): 14–16. http://dx.doi.org/10.53607/wrb.v22.231.

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During the last 30 years, bird mortality caused by overhead wires has been an increasing concern of conservationists, environmental management authorities, and electric companies. Electric companies’ concerns stem in part from power outages that can be caused by these incidents. Animals are the third leading cause of power outages across the US and birds cause more outages than any other animal (Harness and Wilson 1998). This issue is important to conservationists because populations of endangered species may be unable to compensate for the deaths caused by utility structures (Bevanger 1998). In 1992, three of the eight California condors (Gymnogyps californianus) released into the wild from a captive breeding program were found electrocuted (Bevanger 1998).

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14

Zhou, Kevin, and Tomáš Brauner. "The surprising subtlety of electrostatic field lines." American Journal of Physics 93, no. 3 (March 1, 2025): 234–40. https://doi.org/10.1119/5.0207201.

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Electric fields are commonly visualized with field line diagrams, which only unambiguously specify the field's direction. We consider two simple questions. First, can one deduce if an electric field is conservative, as required, e.g., in electrostatics, from its field lines alone? Second, are there conservative electric fields with straight field lines, besides the familiar textbook examples with spherical, cylindrical, or planar symmetry? We give a self-contained introduction to the differential geometry required to answer these questions, assuming only vector calculus background.

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15

Ogunboyo, Taiwo. "A Survey of Power Quality Enhancement in Distribution of System of Lines Using Distribution Static Synchronous Compensator." Science View Journal 3, no. 1 (April 15, 2022): 163–70. http://dx.doi.org/10.55989/babz6904.

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Distribution Static Synchronous Compensator (DSTATCOM) is a power electronics tool joined in parallel to the system of lines to mitigate the power quality disruptions such as electric potential swell, sag, electric potential imbalance, electric potential and current harmonics voltage spike, flicker, electric potential fluctuations related to the secondary system of lines.. DSTATCOM provides electric potential control and adequate mitigation for disturbances related with distribution of system lines in community. DSTATCOM is a3-phase device that produces/ take in the dynamic power which the final outcome can transformed suitable situation to deal with specific and accurate able to change quantity of the system of lines. This article offers a critical look to the researches on the DSTATCOM for energy quality enhancement in electric distribution systems. It explains the basic elements and configuration of DSTATCOM, the operation mode of DSTATCOM, principle of operation of DSTATCOM, DSTATCOM configurations, and DSTATCOM control strategies in the electric distribution network.

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16

Schluger, J. H., and C. D. Hopkins. "Electric fish approach stationary signal sources by following electric current lines." Journal of Experimental Biology 130, no. 1 (July 1, 1987): 359–67. http://dx.doi.org/10.1242/jeb.130.1.359.

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African electric fish of a pulse species, Brienomyrus brachyistius (Mormyridae), housed singly in a large, circular arena, were presented with electrical stimuli which mimicked a conspecific intruder. Stimuli were produced with either dipolar or bipolar electrodes in three different geometries. We tracked the unconditioned approach response paths taken by the fish and compared tracks for each of the geometries. The results suggest that B. brachyistius can determine neither the distance nor the direction of an electric dipole from afar, but that they do manage to find the source by maintaining a precise alignment of their body axis parallel to the direction of the local electric field vector (parallel to current lines) while swimming. This behaviour ultimately leads to the current source. We propose that this behaviour may be a simple mechanism mediating the approach response of one electric fish to another.

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17

Liang, Zhen Guang, Yu Ze Jiang, Di Wen Jiang, and Zong Jie Liu. "Calculation of Power Frequency Electric Field under Overhead Lines with Complex Ground." Applied Mechanics and Materials 441 (December 2013): 212–16. http://dx.doi.org/10.4028/www.scientific.net/amm.441.212.

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This paper studied influence of three dimension complex ground on electric field under overhead lines. Surface charge method is discussed and planar triangle surface charge elements are used to represent complex ground. Electric field of overhead lines is analyzed by charge simulation method. Finite straight line charges are used to represent conductors. Then electric field of 220kV double circuit overhead lines over a three dimension small hill is calculated and distribution of electric field 1.5m above the ground is analyzed.

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18

Liu, Bin, Tao Wang, Fei Gu, Jie Wei, Hong Wei Cui, Wei Hua Guo, Rui Yun Miao, and Rui Xiao Wang. "Analysis of 50Hz Electric Fields Generated by Multi-Circuit Transmission Lines on the Same Tower." Applied Mechanics and Materials 700 (December 2014): 67–70. http://dx.doi.org/10.4028/www.scientific.net/amm.700.67.

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The finite element method has been applied to calculate the 50Hz electric fields nearby the transmission lines. The electric field strengths nearby multi-circuit transmission lines on the same tower under different arrangement of phase sequence, nearby the cross-arm are calculated. According to the foreign and domestic security standards of 50Hz electric field, the impacts of overhead transmission lines on environment are evaluated and the adoptable measures to reduce electric field strength are proposed. Meanwhile the distributing pattern of the electric field nearby the cross-arm is analyzed and proposals for further protection measures during maintenance operation are provided.

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19

Zhou, Quan, Li Tu, Rui Bie, Dong Feng, and You Ping Fan. "Multi-State Electric Field Analysis of 1-Tower-Double-Circuit HVDC Transmission Lines Based on Charge Simulation Method." Applied Mechanics and Materials 521 (February 2014): 321–29. http://dx.doi.org/10.4028/www.scientific.net/amm.521.321.

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Currently, there is little experience about design of the 1-tower-double-circuit DC transmission lines. But the electromagnetic field distribution under its lines is complicated. In order to study the nominal electric field distribution of 1-tower-double-circuit DC transmission lines under different situations and a variety of operating conditions, the currents with analytical solutions are used to simulate the discrete or uneven distributed continuous charge. In the works within an acceptable range, the linear equations are built to solve simulation charge according to the electromagnetic theory. And ground nominal electric field of 1-tower-double-circuit DC transmission lines is calculated. The nominal electric field distribution extreme value extreme under different arrangements and nominal electric field distribution under a variety of operating conditions are analyzed comparatively. In this paper, the results show that the arrangements of lines have effects on the distribution characteristics of nominal electric field in normal condition. When monopole or bipolar or the bipolar of one line doesnt work, the change of nominal electric field is pronounced, but their extremes reduce.

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20

Le, Le. "Analysis on the Infrared Imaging Diagnosis Technology for the Insulation State, Fault Types, and Components of Coupling Capacitor." Applied Mechanics and Materials 416-417 (September 2013): 1064–67. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1064.

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Along with the continuous development of Chinese economy, the power consumption continues to rise in China, and many high-voltage electric transmission lines are constantly put in construction. Among them, coupling capacitor is a major coupling device in the carrier communication of the power frequency high-voltage lines, and also a device that has been widely used for measuring and extracting electric energy, and controlling high-frequency protection in the electric power system. However, there are many problems in the application of coupling capacitor to high-voltage electric transmission lines. In the following, some common problems in the application of infrared imaging diagnosis technology to the coupling capacitor in high-voltage electric transmission lines are tested, so that the corresponding problems are found timely and accurately and also the right processing is made.

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21

Jiang, Yu Ze, Zhen Guang Liang, Can Li, and Bin Xiang Du. "Effect of Phase Sequence Layout on Electric Field under Overhead Lines." Advanced Materials Research 960-961 (June 2014): 921–24. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.921.

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This paper discusses effect of phase sequence layout on electric field under overhead lines. Charge simulation method is used. Examples of two circuit overhead lines and four circuit overhead lines show that phase arrangment of lowest height conductors has major influence and phase arrangment of middle height conductors has lesser influence on electric field under overhead lines. Interlacing placed lowest height conductors with different phase and phase arrangement of middle height conductors different from that of lowest height conductors help to reduce electric field.

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22

Liao, Wei, Qing Yang, Kun Ke, Zhenhui Qiu, Yuqing Lei, and Fei Jiao. "Non-Intrusive Voltage-Inversion Measurement Method for Overhead Transmission Lines Based on Near-End Electric-Field Integration." Energies 16, no. 8 (April 13, 2023): 3415. http://dx.doi.org/10.3390/en16083415.

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Existing electric-field integral inversion methods have limited field application conditions, and they are difficult to arrange electric-field measurement points on high-span overhead lines. This paper proposes a non-intrusive voltage measurement method for overhead transmission lines based on the near-end electric-field integration method. First, the electric-field distribution under 10 kV lines is calculated by finite element simulation software. The electric-field distribution of the plumb line and the discrete integral node below the wire are analyzed. Then, based on traditional electric-field integration, a line-voltage-inversion measurement method based on near-end electric-field integration is proposed. In addition, a voltage-monitoring system based on near-end electric-field integration is constructed. Next, the numerical integration types, the number of integration nodes, and the scale coefficient of the near-end region of the inversion algorithm are optimized with the electric-field simulation data. Finally, to verify the voltage-inversion method proposed in this paper, a test platform for overhead-line voltage is constructed using a MEMS electric-field sensor. The results indicate that the voltage-inversion error is 5.75%. The research results will provide theoretical guidance for non-intrusive voltage-inversion measurement of overhead lines.

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23

Voelcker, John. "Spectral lines: An Almost All-Electric Car?" IEEE Spectrum 45, no. 4 (2008): 9. http://dx.doi.org/10.1109/mspec.2008.4476427.

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24

Garg, Rachana, Priya Mahajan, and Parmod Kumar. "Digital Model of Railway Electric Traction Lines." Journal of The Institution of Engineers (India): Series B 98, no. 4 (August 22, 2016): 377–84. http://dx.doi.org/10.1007/s40031-016-0256-2.

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25

Furby, Lita, Paul Slovic, Baruch Fischhoff, and Robin Gregory. "Public perceptions of electric power transmission lines." Journal of Environmental Psychology 8, no. 1 (March 1988): 19–43. http://dx.doi.org/10.1016/s0272-4944(88)80021-5.

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26

Gould, P. L. "Special issue design of electric transmission lines." Engineering Structures 15, no. 4 (July 1993): 227. http://dx.doi.org/10.1016/0141-0296(93)90024-x.

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27

Göttlich, Simone, Michael Herty, and Peter Schillen. "Electric transmission lines: Control and numerical discretization." Optimal Control Applications and Methods 37, no. 5 (November 17, 2015): 980–95. http://dx.doi.org/10.1002/oca.2219.

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28

Lemke, Alexander. "Top Coat Lines Adapted to Electric Mobility." IST International Surface Technology 18, no. 2 (June 2025): 19–21. https://doi.org/10.1007/s35724-025-1654-2.

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29

Yutsis, Vsevolod, Yuriy Rapoport, Volodymyr Grimalsky, Asen Grytsai, Vasyl Ivchenko, Sergei Petrishchevskii, Alla Fedorenko, and Valery Krivodubskij. "ULF Activity in the Earth Environment: Penetration of Electric Field from the Near-Ground Source to the Ionosphere under Different Configurations of the Geomagnetic Field." Atmosphere 12, no. 7 (June 22, 2021): 801. http://dx.doi.org/10.3390/atmos12070801.

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The problem with the penetration of electric fields from atmospheric near-Earth electric current sources to the ionosphere is investigated both within the dynamic simulations of the Maxwell equations in the frequency domain and within the simplified quasi-electrostatic approach. Two cases of the geomagnetic field lines are considered. The first case is the penetration of the geomagnetic field lines deeply into the magnetosphere (open field lines), whereas the second one is the return of these lines into the Earth’s surface (closed field lines). The proper boundary conditions are formulated. It is demonstrated that in the case of the open field lines the results of the dynamic simulations differ essentially from the quasi-electrostatic approach, which is not valid there. In the case of the closed field lines, the results of simulations are practically the same both within the dynamic approach and within the quasi-electrostatic one. From realistic values of the densities of atmospheric electric currents ~0.1 µA/m2, the values of the electric fields within the ionosphere F-layer may reach about 1–10 mV/m.

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30

Hoholyuk, Oksana. "Adaptation of discrete macromodels of electric transmission lines to modern computer tools." Computational Problems of Electrical Engineering 7, no. 2 (December 14, 2017): 83–86. https://doi.org/10.23939/jcpee2017.02.083.

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The paper discusses the methods of creation of mathematical models of electric transmission lines. It is proposed to develop them on the basis of computer simulation data or data obtained by natural experiment using the "black box" approach in the form of state variables. The derived system of discrete equations in the form of state variables equivalent to the system of ordinary differential equations has been adapted to the MATLAB / Simulink software environment by creating the mathematical model using S-Function Block. The simulation results obtained with the use of proposed discrete macromodel are presented and prospects of its further application are discussed.

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31

Hu, Jian Xun, Gong Da Zhang, Hong Yu Zhang, and Xiao Qin Zhang. "Electric Field Analysis of 220 kV Composite Material Tower Lines." Advanced Materials Research 516-517 (May 2012): 1517–20. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1517.

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Using the finite element analysis, this work analyzed the electric field distribution of 220kV transmission steel tower with double-circuit and composite material transmission tower with the same size, and compared the electric field effect of two materials transmission tower for surroundings. And this work compared the vertical and axial electric field distribution along transmission line of the two materials transmission tower. The results indicate the composite material tower can improve the environment of electric field near the transmission lines.

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32

Zhao, L. B., and F. L. Liu. "Balmer-series spectral lines for hydrogen atoms in parallel magnetic and electric fields of white dwarfs." Monthly Notices of the Royal Astronomical Society 507, no. 2 (August 5, 2021): 2283–99. http://dx.doi.org/10.1093/mnras/stab2254.

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ABSTRACT We extended the two-dimensional B-spline approach recently developed to investigate the influence of a strong electric field on atomic structures and spectra for hydrogen atoms in magnetic fields of white dwarfs. Spectral lines for hydrogen in parallel magnetic and electric fields have been calculated. Wavelengths and oscillator strengths are presented for 14 Balmer α transitions as a function of magnetic and electric fields. The magnetic and electric field strengths involved span a scope, respectively, from around 23.5 to 2350 MG, and from 0 to 108 V/m. Our calculations show that the shift of Balmer-series spectral lines induced by a strong electric field reduces as the magnetic field strength increases. The obtained energy levels, wavelengths, and oscillator strengths are compared to available results in the literature, and excellent agreement was discovered. The spectral data reported in this paper can be applied to interpret the shifts of spectral lines of hydrogen in magnetic white dwarfs due to the presence of electric fields, and to predict additional spectral lines dipole-forbidden in a pure magnetic field.

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33

Antsiferov, N. S. "Ways to Reduce Power Losses in Mining Power Supply Lines." Mining science and technology 4, no. 2 (August 25, 2019): 150–56. http://dx.doi.org/10.17073/2500-0632-2019-2-150-156.

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Electric energy is the most common and universal form of energy. It can be produced in large quantities near energy sources, transmitted to large distances, easily distributed between consumers and converted into mechanical, thermal, and light energy. Ensuring reliable and economical quality electric energy supply to mining enterprises with the optimal use of energy resources is one of the most important tasks facing the country's energy sector. In the Russian Federation, high degree of concentration of generating capacities at power plants has been achieved. The main capacities are concentrated in power plants with installed capacity of more than 1 million kW. High importance of the electric power industry is determined by the infrastructural nature of the industry and the direct relationship between the country's economic growth and the level of its development effectiveness. One of the most pressing problems of modern electricity supply is the problem of ensuring the quality of electric energy. The main reason for the deterioration in the electricity quality is widespread non-linear loads that create non-sinusoidal currents and voltage unbalance during their operation. The voltage unbalance is most often caused by the presence of an unbalanced load. Unbalanced load currents flowing through the elements of the power supply system cause unbalanced voltage losses in them. This results in appearance of unbalanced voltages on the terminals of electric apparatus. The voltage deviations at electric apparatus overdriven phase may exceed the normally acceptable values, while the voltage deviations at electric apparatus other phases may remain within the normal limits. In addition to the deterioration of the voltage mode at electric apparatus under the unbalanced voltage conditions, the operating conditions of both the electric apparatus and all the network elements are significantly worsened, and the reliability of the electrical equipment and the power supply system as a whole decreased. The paper considers the issues of reducing the voltage losses in power supply networks by improving quality of electric power.

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34

Zhuang, Xiao Yun, Yong Ming Li, and Jun Ma. "Investigation on the Electromagnetic Interference of Four-Circuit Transmission Lines." Advanced Materials Research 507 (April 2012): 106–11. http://dx.doi.org/10.4028/www.scientific.net/amr.507.106.

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In the paper the calculation of electric field and magnetic field considering the influence caused by the sag is investigated. The method to analyze the influence caused by the transmission lines sag is presented firstly. A 110 four-circuit transmission lines in Chongqing was taken as an example, the electric field and magnetic field in 2D space and 3D space were calculated respective, and comparison was conducted. Result indicate that the electric and magnetic fields obtained in 2D space has an error of 11.2% for electric field, and 7.1% for magnetic field.

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35

Cui, Xiang. "The visualization of electric force lines in two‐dimensional electric field computation." Engineering Computations 17, no. 2 (March 2000): 166–74. http://dx.doi.org/10.1108/02644400010313110.

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36

Cao, Xia. "Electra-electric induction for power generation by cutting through electric field lines." Nano Energy 112 (July 2023): 108519. http://dx.doi.org/10.1016/j.nanoen.2023.108519.

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37

Jiang, Yu Ze, Zhen Guang Liang, and Di Wen Jiang. "Calculation of Electric Field under Overhead Lines with Complex Ground by Two Dimension Surface Charge Method." Advanced Materials Research 1070-1072 (December 2014): 1563–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1563.

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In the paper, influence of complex ground on electric field under overhead lines is studied. Two dimension surface charge method is used and complex ground is modeled with surface charges. Analytical expressions of electric potential and electric field strength produced by surface charge element are deduced. Effectiveness of the method is shown by an example with analytical result. Curve ground and sloping ground are used respectively in calculation of electric field under overhead lines. Results show influence of variation of ground height on distribution of electric field.

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38

Babatunde, S. Emmanuel. "Design and Analysis of High Voltage Insulator for Transmission Lines." Journal of Scientific and Engineering Research 10, no. 2 (February 28, 2023): 32–38. https://doi.org/10.5281/zenodo.10453346.

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<strong>Abstract </strong>Reliable high voltage insulators are required for efficient power transmission. This requirement necessitates careful design of insulators that can support high electric field.  High values of electric field are often responsible for audible noise, electromagnetic pollution, partial discharges and premature aging and degradation of insulator system. Unevenly distributed, electric field is strongest at the sheds nearest to the endpoints of insulators. Hence, under overvoltage condition, a phenomenon known as flashover occurs at these points. To address this problem, metal grading rings can be installed around the sheds at both endpoints, to reduce the non-uniformity of the electric field and improve the flashover voltage condition.  This paper analyzed the electric field distribution along insulator surface with and without grading rings. From the results of the analysis, the electric field distribution on the surface of the insulator was observed to be more evenly distributed when grading rings were installed than when they were not. In this way, the grading rings help the insulator to withstand a higher overvoltage and thus improve the external insulation of the power system.

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Tarko, Rafał, Konrad Kochanowicz, Wiesław Nowak, Waldemar Szpyra, and Tadeusz Wszołek. "Reduction of the Environmental Impact of Electric Field Generated by High Voltage Power Transmission Lines." Energies 14, no. 19 (October 6, 2021): 6388. http://dx.doi.org/10.3390/en14196388.

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The growing interest in the negative environmental impact of overhead power lines of high and extra-high voltage stems from the increasing ecological awareness of societies. Consequently, a number of respective legal restrictions have been issued and actions have been undertaken to reduce this impact, especially in the electric field of the power frequency. The aim of this paper is to analyze the possibilities of reducing the width of electric field influence zones by changing the design parameters of power lines and defining the spatial distribution of its conductors. This analysis was carried out using the developed and experimentally verified models for determining the electric field and audible noise in the power line environment. The computational models were used to analyze the width of the electric field influence zones of 400 kV lines and the noise levels at the borders of these zones. The research focused on single and double circuit 400 kV power lines. It was revealed that a reduction in electric field emissions is accompanied by an increase in noise emission. However, the analyses confirmed that the width of the electric field influence zones can be significantly reduced if the most important design and construction parameters of the line are properly selected. The obtained conclusions are valid not only for 400 kV lines, but also set directions to follow when changing the parameters of high voltage transmission lines of other rated voltages (above 100 kV).

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Vu, Tu Phan. "Calculation of electric field of HVDC transmission lines using finite element method." Science and Technology Development Journal 16, no. 4 (December 31, 2013): 43–52. http://dx.doi.org/10.32508/stdj.v16i4.1583.

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The HVDC transmission lines have been building in many modern countries in all over the world, and it will be an important problem of Viet Nam power transmission. The important phenomena of operation of HVDC transmission lines is corona discharge around HVDC transmission lines that is a cause to increase significantly the electric field strength over ground surface and around lines. This paper presents the investigation and calculation of the electric field strength of many models of HVDC transmission lines such as monopolar, bipolar, single- and double-circuit using the finite element method based on COMSOL MULTIPHYSICS software. The calculation results have shown the strength and shape of the electric field strength at many positions over ground level. These results are also good datum to calculate and design HVDC transmission lines of Viet Nam power transmission in the near future.

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Liashenko, Oleksii, Nikolaj Starodubcev, Hennadii Makarenko, and Aleksandr Pashchenko. "Control of electromechanical systems of conveyor lines." INNOVATIVE TECHNOLOGIES AND SCIENTIFIC SOLUTIONS FOR INDUSTRIES, no. 4(30) (December 11, 2024): 85–96. https://doi.org/10.30837/2522-9818.2024.4.085.

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The subject of research is a method of controlling the speed of an asynchronous motor, connected according to the scheme of an asynchronous-valve stage, which increases the power factor of the drive and positively affects the power system as a whole. The purpose of the work is to develop and study methods of controlling electromechanical systems based on an asynchronous electric drive, which provide highly efficient operation of conveyor lines implemented on their basis as elements of complex technological equipment of an automated process control system. The article solves the following problems: analysis of conveyor line control tasks within the integrated automated process control system of production systems; analysis of actuating elements of conveyor lines electric drive; development of a method for regulating the speed of an asynchronous motor connected according to the circuit of an asynchronous-valve stage. The methodology of the work is based on the methods of the theory of electrical machines, the theory of the electric drive, numerous and analytical methods for solving differential equations, the theory of modeling. The results of the work include a method of controlling the speed of an asynchronous motor, based on the implementation of pulse control, characterized by the ability to maintain control angles of fully controlled power semiconductor elements to achieve a high power factor and change the frequency of turning on the power element of the electronic key that short-circuits the inverter. Influence of duration of relative duration of key commutation on performance element characteristics is investigated. Conclusions. Thus, the use of the proposed method of pulse control of the electric drive allows to expand the upper limit of speed control, increase the efficiency and power factor of the electric drive, reduce the inductance of the smoothing choke

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Zimin, Kirill, Nina Rubtsova, and Andrey Tokarskskiy. "Currents and Voltages Induced by Electric Field in Two Converging Single-wire Overhead Transmission Lines." E3S Web of Conferences 139 (2019): 01044. http://dx.doi.org/10.1051/e3sconf/201913901044.

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The calculations of induced by electric field voltage and current for i line grounded and ungrounded ends depending on p - line convergence part length, а0 minimal distance between convergence lines, and Θ - the angle of lines convergence. Limit values of р, а0 and Θ are determined, one of which disturbance allows to neglect the electric effect of converging transmission lines.

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Kaustubh, A. Vyas, and J. G. Jamnani Dr. "Analytical Design Optimization of 765 kV Transmission Line Based on Electric and Magnetic Fields for Different Line Configurations." European Journal of Advances in Engineering and Technology 5, no. 2 (February 28, 2018): 91–98. https://doi.org/10.5281/zenodo.10702242.

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<strong>ABSTRACT </strong> EHV and UHV AC transmission lines that transmit power through overhead mode require piece of land identified as right-of-ways. These are approximated in relation to the operating effects of the energized line, major focus being given to electric field effects, magnetic field strength and physical clearances. A need exists to determine the distribution of these fields in transmission pathways. Accurate computation of the maximum value of the electric field stress at ground surface is of utmost importance from the view point of human safety. In the present research work, estimation of electric field distribution and computation of magnetic field strength in vicinity of the high voltage transmission lines is carried out for EHV AC transmission lines by a newly developed computer program. It uses concept of charge simulation method (CSM) along with most fundamental Maxwell’s potential coefficient theory. Simulation results for different configurations of double circuit 765 kV EHV AC lines viz., simple vertical, delta and inverted delta configurations are presented. Profiles of Electric and Magnetic fields are plotted in lateral as well as in longitudinal directions considering catenary effect. Also 3D modelling of lines is carried out and resultant electric and magnetic field profiles along one span of lines are shown. Design optimization is also attempted for minimizing right of way along the length of transmission line.

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Kulkarni, G. A., and W. Z. Gandhare. "Prediction of Electromagnetic Fields around High Voltage Transmission Lines." Acta Technica Jaurinensis 10, no. 1 (March 6, 2017): 50. http://dx.doi.org/10.14513/actatechjaur.v10.n1.414.

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The electric and magnetic fields are present around the High Voltage Transmisssion Lines (HVTL) and reported to affect health of the workers working on these hotlines. The key parameter reportedly responsible for detrimental health effects, are internal induced fields in body. Induction of internal fields in different organs is heavily dependent on the external fields. Prediction of hazardous levels of external fields before measurement or in situations difficult for direct measurement will lead to identify the restrictive situations and working conditions for hotline workers. This work propose a method to model electric and magnetic field for different climbing routes using hybrid technique, formed by combining support vector machine (SVM) and neural network (NN) and also electric field and magnetic field values are predicted using NN for increase in tower height. The result shows the performance of proposed method for prediction of electric field and magnetic field for increase in tower height.

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Zhou, Nianrong, Jian Li, Wenbin Zhang, Jiawen Zhao, and Jingjing Zhao. "Research on UAV Safety Distance Warning Technology Based on Electric Field Ring Rate of Change." Electronics 11, no. 21 (October 24, 2022): 3439. http://dx.doi.org/10.3390/electronics11213439.

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With the increasing scale of transmission lines, drone inspection has become a major method of transmission line inspection. In the process of UAV inspection, the safety distance warning of UAV and transmission lines is crucial, and the existing UAV safety distance warning methods have difficulties, such as high cost, low environmental adaptability, and data processing. In this paper, we propose a safety distance warning method based on the rate of change of electric field ring ratio, which can be applied to the inspection process of transmission lines of different voltage levels. In order to accurately measure the electric field strength around the transmission lines, a three-dimensional electric field measurement system for measuring the electric field in space is designed in this paper. Finally, a 10 kV three-phase transmission line experimental platform was built to verify the feasibility of the method proposed in this paper.

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Zhuang, Wenbing, Xiaojun Zhang, Wei Liu, and Zeyang Lei. "A bird droppings flashover analysis method based on the combination of electric field distortion and spatial electric field distribution." Journal of Physics: Conference Series 2771, no. 1 (May 1, 2024): 012030. http://dx.doi.org/10.1088/1742-6596/2771/1/012030.

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Abstract To study the flashover of air gap caused by bird droppings shorting air gap and the influence of space electric field change on it, the distortion electric field simulation, space electric field simulation, and related flashover test of transmission line bird droppings falling process were carried out. By analyzing the specific influencing factors of bird droppings flashover fault, it is pointed out that the electric field distortion caused by bird droppings will affect the spatial electric field distribution around the insulator and thus affect the air gap flashover. This study analyzes the specific causes of bird dropping flashover of transmission line insulators, reduces the number of bird damage trips of transmission lines, reduces the cost of operation and maintenance of transmission lines, improves the intrinsic safety of transmission lines, and ensures the safe and reliable operation of power grids.

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Chen, Wenwen, Yanfei Wang, Yuchen Huang, Yongjin Chen, Shun Luo, and Meiling Deng. "The impact of massive EV charging on distribution lines." Journal of Physics: Conference Series 2703, no. 1 (February 1, 2024): 012065. http://dx.doi.org/10.1088/1742-6596/2703/1/012065.

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Abstract The large-scale charging of electric vehicles at the same time is bound to have a large impact on the distribution network and then reduce the stability of the grid, especially during peak hours when it is easy to overload the lines. In this paper, we combine battery capacity and charging power data of electric vehicles and user usage habits to model the charging load changes of electric vehicles at different scales. The impact of charging by EV owners on network load was also analyzed through case studies. Our results have a certain practical significance for the planning of power grid lines.

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Oh, Geon, Yunhui Jo, Yongha Gi, Heehun Sung, Jaehyun Seo, Hyunwoo Kim, Jaemin Lee, and Myonggeun Yoon. "Potential prognostic factor in alternating electric fields therapy based on absorbed energy in tissue." AIP Advances 12, no. 9 (September 1, 2022): 095311. http://dx.doi.org/10.1063/5.0100820.

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The present study aimed to determine a method for estimating a potential prognostic factor in alternating electric fields for the treatment of solid tumors based on cell survival curves that evaluate cell proliferation capability. In AGS, B16F10, U373, and HPAF-II cancer cell lines, the proportional relationships of the electric field magnitude and the duration of application with the proliferation of cancer cell lines was identified by in vitro alternating current electric field experiments performed under various conditions. A prognostic factor applicable to alternating electric field therapy was developed by identifying proportional relationships of the electric field magnitude and the duration of application with the proliferation of the four cancer cell lines. Through the experimental results, the absorbed energy in tissue has been suggested as a potential prognostic factor in alternating electric field therapy. The absorbed energy in tissue can be used as a reference to quantify the inhibition of cell proliferation related to control, enabling systematic assessment of alternating electric field therapy which, to date, has not been possible.

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Mammadov, A. F., and A. Matsyura. "Bird collisions with power lines in Nakhchivan Autonomous Republic." Ukrainian Journal of Ecology 10, no. 1 (February 25, 2020): 180–85. http://dx.doi.org/10.15421/2020_29.

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The article summarizes the results of research in four selected sites (observations) on the impact of surface power lines on bird death in the area of Nakhchivan Autonomous Republic in 2016-2017. Studies show that electrical wires have a major impact on bird death during the spring migration and nesting period. We determined that 225 individual of 27 species were killed by electric shock in selected areas, while 16 individuals belonging to 3 predator bird species were exposed to this threat. Two of these species are in the World Red List. The next plot with high mortality rate was the Cananbar well - Shikhmahmud plain (2 km), although we did not make a research here for the first two months. An average mortality rate of birds here were 2.72 individuals/km. The electric poles in the selected Nakhchivan - Shikhmahmud road (4 km) consisted mainly of wooden material and were sometimes replaced with reinforced concrete. We attribute the fact that the percentage of deaths in this area is lower than other stations because of the poles are more wooden. Among the dead birds some species belonging to the Red List of the World (Falco naumanni and Coracias garrulus). As we already mentioned, beside the overhead electric wires were mainly dangerous to Ciconia ciconia, Buteo rufinus and eagles. The dead and wounded species were recorded only one to four km from the electric line. Among the most common species exposed electric shocks were: Columba livia, Merops apiaster, Corvus frugilegus, Sturnus vulgaris and Passer domesticus. A total of 3,225 birds from 26 species were killed by the private electric shock during the study, four birds could not be identified (unknown species). When looking at the process from a landscape-species perspective, bird species - those most exposed to the electric wires are: less open, open space (loos); forest landscape (fl); residential areas (ra) and less grove areas (lga).

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Choopum, Cattareya, and Boonchai Techaumnat. "Numerical Investigation on the Effects of Wind and Shielding Conductor on the Ion Flow Fields of HVDC Transmission Lines." Energies 16, no. 1 (December 24, 2022): 198. http://dx.doi.org/10.3390/en16010198.

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Ion flow field is an important aspect of high voltage direct current (HVDC) transmission lines. In this paper, we apply the upwind finite volume method for solving the ion flow field of three HVDC configurations to clarify the effect of the wind and the role of shielding conductors. For the monopolar configuration installation, the ground current distribution with underbuilt shield wires was studied numerically and experimentally. For the ±250 kV bipolar configuration, the calculated peak electric field and current density are verified with the values in a reference. The ±500 kV bipolar configuration is used to investigate the change in electric field and ion current within the same corridors of the existing HVAC lines. We analyze the ion flow field with and without the dedicated metallic return conductor (DMRC). In the absence of wind, the maximum of the electric field is lower than that of the HVAC lines and the current density is very low on the ground. In the presence of wind, the electric field and the current distribution become unsymmetrical on the ground level. The peak current density increases significantly on the downwind side. The HVDC line without DMRC has the electric field peak higher than that of the HVAC lines. With the higher wind shear coefficient, the peak of the electric field and the current density increases on the downwind side. Overall investigations summarize that DMRC can effectively reduce the peak of the electric field to be lower than that of the existing 500 kV HVAC lines under all wind conditions.

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