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Journal articles on the topic 'Overhead lines analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Pronichev, А. V., E. O. Soldusova, and E. M. Shishkov. "ANALYSIS ELECTRIC REGIMES OF OPEN OVERHEAD TRANSMISSION LINES." Dynamics of Systems, Mechanisms and Machines 6, no. 3 (2018): 072–77. http://dx.doi.org/10.25206/2310-9793-2018-6-3-72-77.

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2

Chowdhuri, P. "Analysis of lightning-induced voltages on overhead lines." IEEE Transactions on Power Delivery 4, no. 1 (1989): 479–92. http://dx.doi.org/10.1109/61.19238.

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3

Zhang, Xiaoqing, and Kejie Huang. "Lightning Surge Analysis for Overhead Lines Considering Corona Effect." Applied Sciences 11, no. 19 (September 25, 2021): 8942. http://dx.doi.org/10.3390/app11198942.

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Corona discharge characteristics are measured in a corona cage. The difference is found between the q–u curves under double exponential and damped oscillation surges. The behavior of the minor loops is revealed for the q–u curves under positive and negative damped oscillation surges. An extended improvement is made on the traditional approach for modeling of the q–u curves under damped oscillation surges. The extended approach has the capability of describing the complicated trajectory feature of the minor loops. On the basis of the extended approach, an efficient method is proposed for performing lightning surge analysis of overhead lines considering the corona effect. In the proposed method, an overhead line with corona is divided into a certain number of line segments. Each segment is converted into a circuit unit consisting of a non-linear branch and a linear circuit. With these circuit units connected in sequence, a complete equivalent circuit is constructed for the overhead line with corona. The transient responses can be obtained from the solution to the equivalent circuit. Then, the calculated results are compared with the field test results on a test overhead line.

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4

Khalyasmaa, Alexandra I., Stepan A. Dmitriev, and Sergey E. Kokin. "Methods of Failure Analysis of 35-110 kV Overhead Transmission Lines." Advanced Materials Research 732-733 (August 2013): 677–81. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.677.

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This paper addresses the problem of failure analysis of 35-110 kV overhead transmission lines using the main methods: correlation analysis, regression analysis and expert judgment method. There are weaknesses identified of these analysis methods for power network district of the city for 35-110 kV overhead transmission lines.

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5

Kondrateva, Olga, Ekaterina Myasnikova, and Oleg Loktionov. "Analysis of the Climatic Factors Influence on the Overhead Transmission Lines Reliability." Environmental and Climate Technologies 24, no. 3 (November 1, 2020): 201–14. http://dx.doi.org/10.2478/rtuect-2020-0097.

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AbstractIn this study, the influence of climatic factors on overhead transmission lines reliability in Russia was discussed. A review of the possible impacts of climate change is provided. Using the example of an electric grid company providing electricity in the Republic of Bashkortostan some reliability targets associated with the impacts of weather events were calculated: the number of power outages, the failure rate of 1 km of overhead transmission lines and the outage time. From the calculations it was determined that these targets are at a quite high level, in particular for 6-10 kV overhead transmission lines. The main contribution is made by climatic factors wind and lighting storm. A correlation analysis of the overhead transmission lines outages as a function of the number of wind cases with a certain speed has shown a strong relationship between these characteristics. According to predictive information, the number of power outages in the territory under consideration in 2025 will increase by 1.5 times.

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6

Kondrateva, Olga, Ekaterina Myasnikova, and Oleg Loktionov. "Analysis of the Climatic Factors Influence on the Overhead Transmission Lines Reliability." Environmental and Climate Technologies 24, no. 3 (November 1, 2020): 201–14. http://dx.doi.org/10.2478/rtuect-2020-0097.

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Abstract In this study, the influence of climatic factors on overhead transmission lines reliability in Russia was discussed. A review of the possible impacts of climate change is provided. Using the example of an electric grid company providing electricity in the Republic of Bashkortostan some reliability targets associated with the impacts of weather events were calculated: the number of power outages, the failure rate of 1 km of overhead transmission lines and the outage time. From the calculations it was determined that these targets are at a quite high level, in particular for 6-10 kV overhead transmission lines. The main contribution is made by climatic factors wind and lighting storm. A correlation analysis of the overhead transmission lines outages as a function of the number of wind cases with a certain speed has shown a strong relationship between these characteristics. According to predictive information, the number of power outages in the territory under consideration in 2025 will increase by 1.5 times.

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7

Xia, Yunfeng, Fan Kuang, Ting Yang, Guanhao Chen, and Rui Yang. "Breakage Mechanism Study of Overhead Ground Wire Under Lighting Stroke Based On Finite Element Analysis." E3S Web of Conferences 237 (2021): 02011. http://dx.doi.org/10.1051/e3sconf/202123702011.

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Breakage of overhead transmission lines and distribution lines will lead to severe power outage problems, and clarifying the breakage mechanism of the overhead lines is of great importance and value for the reliability and stability of the power system. Taking overhead ground wire for example, this paper presents its breakage mechanism study under lighting stoke based on finite element analysis. A multi-physics analysis model is built first, which includes the model of contact points. The current density distribution and the temperature rise under the impact of short circuit current are analysed, and contact resistance effect is proved the primary cause for the breakage. Then some major factors that influence the contact resistance which in turn influence the temperature rise are discussed. Based on the discussions, some valuable suggestions are given for the protection of overhead lines.

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8

Deng, Yuan Jing, Jun Chao Yu, Kai Quan Xia, and Lin Yang. "Corrosion Conditions Analysis of In-Service ACSR Overhead Lines." Applied Mechanics and Materials 446-447 (November 2013): 753–58. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.753.

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The corrosion conditions of in-service aluminum conductor steel reinforced (ACSR) overhead lines in typical climate were studied by using macroscopic and microscopic methods. According to its operating environment, the corrosion causes were also analyzed. It is found that the corrosion of the outer aluminum stranded conductors is more serious than other parts. And partial corrosion pits have been found on the outer layers of aluminum stranded conductors. While there is no obvious corrosion appeared on the steel core matrix. Additionally, corrosion products can reduce the corrosion rate of aluminum stranded conductors but accelerate corrosion of the steel core. Through this research, more attention should be paid to monitor the aluminum stranded conductors.

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9

Zhang, Meng, Guifeng Zhao, and Jie Li. "Nonlinear Dynamic Analysis of High-Voltage Overhead Transmission Lines." Shock and Vibration 2018 (2018): 1–35. http://dx.doi.org/10.1155/2018/1247523.

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According to a generalized Hamilton’s principle, three-dimensional (3D) nonlinear vibration equations for overhead transmission lines that consider geometric nonlinearity are established. Based on the characteristics of an actual transmission line, the 3D equations are simplified to two-dimensional equations, and the nonlinear vibration behavior of transmission lines is investigated by combining theoretical analysis with numerical simulation. The results show that transmission lines have inherently nonlinear vibration characteristics. When in free vibration, a transmission line can undergo nonlinear internal resonance, even when its initial out-of-plane energy is relatively low; as its initial out-of-plane energy increases, the coupling of in-plane and out-of-plane vibration becomes stronger. When forced to vibrate by an external excitation, due to the combined action of internal and primary resonance, the vibration energy of a transmission line transfers from the out-of-plane direction to the in-plane direction that is not directly under the excitation, resulting in an increase in the dynamic tension and the displacement amplitude of the transmission line. Increasing damping can consume the vibration energy of a transmission line but cannot prevent the occurrence of internal resonance.

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10

Coelho, Vilson Luiz, Adroaldo Raizer, and José Osvaldo Saldanha Paulino. "Analysis of the Lightning Performance of Overhead Distribution Lines." IEEE Transactions on Power Delivery 25, no. 3 (July 2010): 1706–12. http://dx.doi.org/10.1109/tpwrd.2010.2044195.

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11

Boumaiza, Mostefa, and Djamel Labed. "Analysis of Lightning-induced Voltages in Overhead Transmission Lines." Energy Procedia 50 (2014): 41–49. http://dx.doi.org/10.1016/j.egypro.2014.06.005.

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12

Gogola, Roman, Justín Murín, and Juraj Hrabovský. "Numerical Calculation of Overhead Power Lines Dynamics." Strojnícky casopis – Journal of Mechanical Engineering 66, no. 2 (November 1, 2016): 13–22. http://dx.doi.org/10.1515/scjme-2016-0014.

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Abstract This paper contains results of transient analysis of airflow around the ACSR power line cross-section in unsymmetric multi-span. The forces applied to the power line are obtained from CFD simulations, where the wind induced vibration is studied. Effect of these forces to the maximal displacement of the power line and the maximal mechanical forces in the points of attachment are studied and evaluated.

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13

Zhou, Jia, Xiao Long Tan, and Wen Bin Wang. "Analysis of Electrical Field of Overhead Line." Applied Mechanics and Materials 556-562 (May 2014): 1530–32. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1530.

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Ellipse expression is difficult to be found directly. And the detail form which is important for electrical field analysis has not been described. The arrangement mode of lines affect electrical field significantly. Hence, simulation of triangular and horizon arrangement are proceeded in this paper. The terms include rotation track, rotation direction and initial phase angle.

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14

Wadley, David, Jung Hoon Han, and Peter Elliott. "Regarding high voltage overhead transmission lines (HVOTLs)." Property Management 37, no. 2 (April 15, 2019): 178–96. http://dx.doi.org/10.1108/pm-04-2018-0024.

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Purpose Professionals’ market knowledge and business experience can facilitate transactions of residential property potentially impacted by stigmatised installations, such as large-scale public infrastructure. The purpose of this paper is to explore perceptions and assessments among homeowners, valuers (appraisers) and real estate agents (realtors) regarding infrastructure in general and high voltage overhead transmission lines (HVOTLs) in particular. Design/methodology/approach Informed by a literature review, separate surveys in Queensland, Australia, analyse via non-parametric and parametric means informational and perceptual variables concerning HVOTLs among 600 homeowners, 90 valuers and 90 real estate agents. Findings The findings reveal statistically significant differences in risk and valuation perceptions of homeowners, valuers and real estate agents relating to the placement of major linear forms of infrastructure. Research limitations/implications This study adds to a now-solid body of literature pertaining to property effects of HVOTLs. It extends the analysis among classes of real estate professionals and provides new comparisons for further analysis and commentary. Practical implications The results speak to property professionals, land use planning and electricity authorities. Prior research can be triangulated with that obtained here from valuers and real estate agents who act as informants, gatekeepers and confidants in the market place. Various hypotheses address specific points of professional practice. Social implications This study shows that property professionals’ disposition to HVOTLs and other large-scale infrastructure is likely to be a good deal more measured than that of homeowners, so that valuers and real estate agents might exercise a mediating influence in placement and installations decisions. Originality/value This research raises understanding of differences in market knowledge and perception of essential infrastructure among clients and property agents. As a point of difference, it concentrates on examining empirically what texts refer to as “information asymmetry” in residential real estate markets.

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15

Dai, Lili, Yongli Zhu, and Zehui Liang. "Mechanics Analysis of Overhead Transmission Lines Based On-line Monitoring." Open Journal of Applied Sciences 03, no. 02 (2013): 1–4. http://dx.doi.org/10.4236/ojapps.2013.32b001.

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16

Dua, Alok, Mathias Clobes, Thomas Höbbel, and Vasant Matsagar. "Dynamic Analysis of Overhead Transmission Lines under Turbulent Wind Loading." Open Journal of Civil Engineering 05, no. 04 (2015): 359–71. http://dx.doi.org/10.4236/ojce.2015.54036.

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17

Martinez, J. A., and F. Castro-Aranda. "Lightning Performance Analysis of Overhead Transmission Lines Using the EMTP." IEEE Transactions on Power Delivery 20, no. 3 (July 2005): 2200–2210. http://dx.doi.org/10.1109/tpwrd.2005.848454.

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18

Radojevic, Zoran, Vladimir Terzija, Gary Preston, Shantanu Padmanabhan, and Damir Novosel. "Smart Overhead Lines Autoreclosure Algorithm Based on Detailed Fault Analysis." IEEE Transactions on Smart Grid 4, no. 4 (December 2013): 1829–38. http://dx.doi.org/10.1109/tsg.2013.2260184.

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19

Xiaopo, Mao, Zhang Yaodong, Zhou Xueming, Feng Zhiqiang, Huang Zeqi, Ren Xiang, Shi Tianru, Fu Jianjin, and Huang Junjie. "Analysis of Bird Damage Prevention Mechanism for Overhead Transmission Lines." Journal of Physics: Conference Series 1639 (October 2020): 012038. http://dx.doi.org/10.1088/1742-6596/1639/1/012038.

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20

Theodosoglou, I., V. Chatziathanasiou, A. Papagiannakis, B. Więcek, and G. De Mey. "Electrothermal analysis and temperature fluctuations’ prediction of overhead power lines." International Journal of Electrical Power & Energy Systems 87 (May 2017): 198–210. http://dx.doi.org/10.1016/j.ijepes.2016.07.002.

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21

Paulino, J. O. S., C. F. Barbosa, I. J. S. Lopes, and W. C. Boaventura. "Assessment and analysis of indirect lightning performance of overhead lines." Electric Power Systems Research 118 (January 2015): 55–61. http://dx.doi.org/10.1016/j.epsr.2014.07.016.

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22

Radojević, Z., and V. Terzija. "Numerical algorithm for overhead lines protection and disturbance records analysis." IET Generation, Transmission & Distribution 1, no. 2 (2007): 357. http://dx.doi.org/10.1049/iet-gtd:20060139.

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23

Kwinta, Andrzej, Karolina Ważydrąg, and Mariusz Zygmunt. "Analysis of power lines span geometry based on TLS measurements." E3S Web of Conferences 55 (2018): 00013. http://dx.doi.org/10.1051/e3sconf/20185500013.

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The inventory measurements of utility infrastructure are crucial issues in the field of engineering geodesy. Secure usage of power lines requires to monitor their geometry. According to classical approach to measurements of geometry of overhead power lines, it usually allows only to measure directly. Geodetic methods cannot be applied due to measuring limitations (lack of an appropriate area to conduct a measurement). Currently in engineering geodesy it is becoming more common to use methods of laser scanning as well as Unmanned Aerial Photogrammetric Survey. In the Paper, the procedure of determining of an overhead power line’s geometry is presented on the example of an one span measured with Terrestrial Laser Scanning methods. Field measurements were conducted by using laser scanner. Afterwards the point cloud was processed in order to receive the geometry of conductor. Finally, results were presented is tabular and graphic form.

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24

Li, Jian, Xu Dong, Zhong Cai Zheng, Yan Gao, Zhen Ting Jiang, and Hai Yong Xiao. "Modal Analysis of the Line Inspection Robot's Manipulator." Applied Mechanics and Materials 681 (October 2014): 100–105. http://dx.doi.org/10.4028/www.scientific.net/amm.681.100.

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The Line Inspection Robot is used to detect the line's defects when it walks on the overhead lines. It will be swinging under its own vibration and the action of wind , due to the robot arms hanging on overhead line alone ,so the dynamic characteristics of robot arm cannot be ignored. In this paper, we establish three-dimensional models of the line inspection robot's manipulator with double manipulators of antisymmetric structure, and conduct solving and post-processing of statics and modal analysis after meshing and applying constraints. The manipulator's low frequencies and vibration modals are drawn, so we can provide a theoretical basis for the reasonable optimization improvements to the line inspection robot's manipulator with double manipulators of antisymmetric structure.

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25

Zhu, Shiyang, and Le Wang. "Research on the decision of state maintenance for transmission line based on set pair analysis." Indian Journal of Power and River Valley Development 71, no. 1&2 (March 12, 2021): 17. http://dx.doi.org/10.18311/ijprvd/2021/27307.

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Overhead transmission lines are important parts of a power system; their operation state directly affects the reliability level of the entire power system. With the in-depth development of state maintenance work for power grids, correctly evaluating the reliability of overhead transmission lines is the key to successful maintenance. A maintenance decision model for transmission lines is established in this study based on set pair analysis to achieve human financial control and low maintenance efficiency. Full consideration is provided to the influence of environmental factors, and a theoretical basis for transmission line maintenance decision is established.

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26

Korkishko, A. N., O. A. Korkishko, and A. A. Kosov. "Feasibility study on the use of oil-well tubing in construction of intermediate support for 6-10 kV high voltage overhead power lines in the development of oilfields." E3S Web of Conferences 124 (2019): 05042. http://dx.doi.org/10.1051/e3sconf/201912405042.

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This article is devoted to assessing the technical effectiveness and economic feasibility of oilwell tubing in construction of intermediate supports for overhead power lines (6–10 kV) in the development of oil, gas and condensate field in the conditions of Far North. The article considers the technical possibility and economic feasibility of using the built-up cross section of the intermediate support of overhead lines consisting of two tubes welded together. The SCAD office software was used to calculate the strength of the proposed section for the design load, taking into account the impact of climatic factors. A comparative analysis of the construction cost was performed for 1 km of overhead power lines made of conventional materials and oil-well tubing. The calculations showed the feasibility of using this material for the construction of 6-10 kV overhead lines.

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27

Wang, Mengxia, Ming Yang, Jianhui Wang, Mingqiang Wang, and Xueshan Han. "Contingency Analysis Considering the Transient Thermal Behavior of Overhead Transmission Lines." IEEE Transactions on Power Systems 33, no. 5 (September 2018): 4982–93. http://dx.doi.org/10.1109/tpwrs.2018.2812826.

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28

Dolara, Alberto, George Cristian Lazaroiu, and Emanuele Ogliari. "Efficiency analysis of PV power plants shaded by MV overhead lines." International Journal of Energy and Environmental Engineering 7, no. 2 (April 30, 2016): 115–23. http://dx.doi.org/10.1007/s40095-016-0208-2.

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29

Sun, Qiuqin, Lei Yang, Qian Li, Xiaorong Zhang, Feng Wang, She Chen, and Lipeng Zhong. "Surge analysis for lightning strike on overhead lines of wind farm." Electric Power Systems Research 194 (May 2021): 107066. http://dx.doi.org/10.1016/j.epsr.2021.107066.

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30

Alipio, R., H. Xue, and A. Ametani. "An accurate analysis of lightning overvoltages in mixed overhead-cable lines." Electric Power Systems Research 194 (May 2021): 107052. http://dx.doi.org/10.1016/j.epsr.2021.107052.

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31

Cherkashyna, Veronika. "ANALYSIS OF PARAMETERS SERIES OF WIRE CROSS-SECTIONS FOR OVERHEAD POWER LINE DESIGN." EUREKA: Physics and Engineering 2 (March 31, 2016): 3–12. http://dx.doi.org/10.21303/2461-4262.2016.00055.

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In the analysis of the parameters series of wire cross-sections for the overhead power line design taking into account their development prospects, the author solved the following tasks. The study of the existing parameter, which characterizes and determines the optimization option of the technical and economic model for the design of overhead lines, which allowed showing the unreasonableness of using the economic current density as the basic optimization parameter of the technical and economic model of overhead lines is performed. The wire cross-section as the basic optimization parameter of the technical and economic model of overhead lines is proposed. The scale growth factor of the parameters series of wire cross-sections is obtained by the criteria-based method, which allowed developing an optimum scale of wire cross-sections. Estimation of the statistical characteristics of the distribution of the relative value of wire cross-sections is carried out. The introduced hypothesis of a log-normal distribution law of the current density is tested using the Pearson's chi-squared test for finding the relationship of relative variation of the initial information on the scale growth factor of wire cross-sections. The effect of the optimum scale of wire cross-sections on the regulations of reconstruction, which is due to the load rate and growth variations in the power grid is determined.

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32

SHEINA, G. "Analysis of mathematical models of transmission lines." Journal of Electrical and power engineering 23, no. 2 (December 23, 2020): 16–19. http://dx.doi.org/10.31474/2074-2630-2020-2-16-19.

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This paper investigates a mathematical model of one elements of the power supply system - power transmission lines. The type of models depends on the initial simplifications, which in turn are determined by the complexity of the physics of processes. The task of improving the accuracy of modeling of emergency processes in the power system is due to the significant complexity of modern power systems and their equipment, high-speed relay protection, automation of emergency management and the introduction of higher-speed switching equipment. One of the reasons for a significant number of serious emergencies in the system is the lack of complete and reliable information for modeling modes in the design and operation of power systems. The development of a mathematical model of a three-phase power line, which provides adequate reflection of both normal and emergency processes, is relevant. The advanced mathematical model of power transmission lines allows to investigate various operational modes of electric networks. The improved mathematical model of the power transmission line reflects all the features of physical processes at state modes and transient process and provides sufficient accuracy of the results. The type of mathematical model of power transmission lines depends on the accepted simplifications, depending on the task of research. The purpose of this work is to analyze the mathematical model of the power transmission line to study the modes of operation of the power supply system, with the possibility of its application to take into account all the design features of overhead and cable power lines. The mathematical model of the power line for the study of the modes of operation of the power supply system is analyzed. It is used to take into account the design features of overhead and cable power lines, skin effect.

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33

Cherkashуna, V. V., and V. M. Baklitsky. "IMPROVEMENT OF TECHNICAL AND ECONOMIC MODELS OF OVERHEAD LINES TRANSMISSION BASED ON CRITERIONAL METHOD." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (1) (December 30, 2020): 89–94. http://dx.doi.org/10.20998/2224-0349.2020.01.13.

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Improved technical and economic models of 35–750 kV overhead lines in accordance with the Law of Ukraine "On the Electricity Market" are proposed. The urgency and complexity of the problem is due to the fact that the transition to market relations presupposes the presence of private property, where the area under the grid facility, including the route of overhead lines, is a commodity and should be taken into account in shaping the value of this facility. In this regard, there is a need to review the discounted costs in the design of lines to bring them into line with market relations. The development of a new technical and economic model of 35–750 kV overhead lines was carried out taking into account the size and cost of land under the route of the line, which allows for a feasibility study of the optimal design option for the electrical network. The specific part of the land area in the cost of 1 km of overhead lines of different voltage classes is calculated. The components of the improved technical and economic model of 35–750 kV overhead lines are determined, namely the specific part of the component costs in the total cost of 1 km overhead lines of different voltage classes. A graphical representation of generalized models of investments in 35–750 kV overhead lines is presented. The presented studies take into account that during the construction of technical and economic models it is almost impossible to predict all its internal often stochastic connections, the elements of which cannot be expressed unambiguously, which leads to incomplete source information. Based on this fact, in the article for the analysis of the developed technical and economic models of lines the criterion method which allows to make decisions in conditional units both at full and at incomplete and indefinite initial information is applied. Implementing each equation of the developed technical and economic model of 35–750 kV overhead lines by the criterion method the ratio of components in the optimal design of lines in the corresponding voltage class is obtained, which allows to determine the development strategy of electrical networks and to form restrictions in incomplete source information.

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34

Karamov, Dmitriy, and Sergey Perzhabinsky. "Influence of failures of overhead lines on reliability of autonomous power supply system." E3S Web of Conferences 69 (2018): 02015. http://dx.doi.org/10.1051/e3sconf/20186902015.

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We research influence of failures of overhead lines on reliability of autonomous power supply system with distributed generation in the given article. Simulation of failures of overhead lines are done on the base of long-term data of exploitation distributing electricity networks. Considered autonomous power supply system consists of wind and solar power stations. Diesel generators are emergency sources of electricity in the system. For adequacy estimation of electricity supply we many times simulated and analyzed of random states of autonomous power supply system. Results of experimental research confirm that detailed accounting of statistics of real failures of overhead lines increases of quality of reliability analysis.

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35

Ahmedova, Olga, Anatoliy Soshinov, and Natalia Shevchenko. "Analysis of influence of external atmospheric factors on the accuracy of fault location on overhead power lines." E3S Web of Conferences 178 (2020): 01057. http://dx.doi.org/10.1051/e3sconf/202017801057.

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Devices of fault location are widespread in electrical grids. In overhead power lines of voltages of 10 kV and higher, such devices are based on measurements of parameters in emergency mode. These devices can be divided into two main groups: designed to determine fault location of short circuits and of ground short circuit. In both cases, when detecting fault location, analyzed are not only the current and voltage parameters at the accident time, but also the parameters of overhead power line. When analyzing equivalent circuits of power lines, approximate tabular values of direct and quadrature parameters are used. It was revealed, that the line parameters are significantly affected by external atmospheric factors: ambient temperature, soil moisture, wind strength and direction, ice formation, etc. To accurately determine the fault location, it is necessary to evaluate the influence of these factors on the linear parameters of the overhead line. The paper presents analysis of the influence of changes in atmospheric factors on parameters of overhead power line. A methodology for calculating the operation setpoints of the device for fault location in power line is given.

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36

Lazaropoulos, Athanasios G. "Review and Progress towards the Common Broadband Management of High-Voltage Transmission Grids: Model Expansion and Comparative Modal Analysis." ISRN Electronics 2012 (December 27, 2012): 1–18. http://dx.doi.org/10.5402/2012/935286.

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The need of bridging the digital gap between underdeveloped/developed areas and promoting smart grid (SG) networks urges the deployment of broadband over power lines (BPL) systems and their further integration. The contribution of this paper is fourfold. First, based on the well-established hybrid model of (Lazaropoulos and Cottis 2009, 2010, Lazaropoulos, 2012) and the generic multidimensional network analysis tool presented in (Lazaropoulos 2012, Sartenaer 2004, Sartenaer and Delogne 2006, 2001) an exact multidimensional chain scattering matrix method, which is suitable for overhead high-voltage/broadband over power lines (HV/BPL) networks, is proposed and is evaluated against other theoretical and experimental proven models. Second, the proposed method investigates the overhead HV/BPL transmission grids (overhead 150 kV single-circuit, 275 kV double-circuit, and 400 kV double-circuit multiconductor structures) with regard to their end-to-end signal attenuation. It is found that the above features depend drastically on the overhead power grid type, the frequency, the MTL configuration, the physical properties of the cables used, the end-to-end distance, and the number, the length, and the terminations of the branches encountered along the end-to-end BPL signal propagation. Third, the impact of the multiplicity of the branches at the same junction in overhead HV grids is first examined. Based on the inherent long-branch structure and the quasi-static behavior of single/multiple branches with matched terminations of overhead HV grid, a simple approach suitable for overhead HV/BPL channel estimation is presented. Fourth, identifying the similar characteristics among different overhead HV/BPL configurations, an additional step towards the common overhead HV/BPL analysis is demonstrated; the entire overhead HV/BPL grid may be examined under a common PHY framework regardless of the overhead HV/BPL grid type examined. Finally, apart from the presentation of broadband transmission potential of the entire overhead transmission power grid, a consequence of this paper is that it helps towards: (i) the better broadband monitoring and management of overhead HV transmission power grids in an interactive SG network; and (ii) the intraoperability/interoperability of overhead HV/BPL systems under the aegis of a unified transmission/distribution SG power network.

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Wei, Fei Xiang, Yang Song, Xiao Xu Ma, and Ying Qian. "Study on Reasons of the Falling of the Overhead Line Based on Fault Tree Analysis." Applied Mechanics and Materials 325-326 (June 2013): 590–93. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.590.

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The transmission line is an important part of the power system, its reliability will directly affect the reliability of the power system. The reliability of the overhead line plays a crucial role for the power system reliability. This paper analyze the reasons of the falling of the overhead lines, establish a fault tree, and make qualitative and quantitative analysis of the fault tree.

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Chen, Guang, Yang Liu, Yong Ma, Jie Chen, Zhi Cheng Zhou, and Hong Ze Li. "Experimental Analysis and Engineering Design of Laser Removing Technology for Extra Matters on Overhead Lines." Applied Mechanics and Materials 672-674 (October 2014): 1109–16. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1109.

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This paper proposes a convenient and safe method for removing extra matters on overhead lines by distantly irradiating the extra matters with high-energy laser beam. Theoretical study and field experiments on the feasibility of this method were carried out according to the thermal properties of the main components of overhead lines and common extra matters on them. Results show that infrared laser is a better choice to be used to remove the extra matters than ultraviolet and visible laser lights. Experimental results also indicate that there is a large feasible scope of laser power density in which common extra matters can be efficiently removed while the conductors and grounding lines get no harm. Moreover, preliminary design of the laser removing system is given in this paper for practical application.

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Tognola, Gabriella, Marta Bonato, Emma Chiaramello, Serena Fiocchi, Isabelle Magne, Martine Souques, Marta Parazzini, and Paolo Ravazzani. "Use of Machine Learning in the Analysis of Indoor ELF MF Exposure in Children." International Journal of Environmental Research and Public Health 16, no. 7 (April 6, 2019): 1230. http://dx.doi.org/10.3390/ijerph16071230.

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Characterization of children exposure to extremely low frequency (ELF) magnetic fields is an important issue because of the possible correlation of leukemia onset with ELF exposure. Cluster analysis—a Machine Learning approach—was applied on personal exposure measurements from 977 children in France to characterize real-life ELF exposure scenarios. Electric networks near the child’s home or school were considered as environmental factors characterizing the exposure scenarios. The following clusters were identified: children with the highest exposure living 120–200 m from 225 kV/400 kV overhead lines; children with mid-to-high exposure living 70–100 m from 63 kV/150 kV overhead lines; children with mid-to-low exposure living 40 m from 400 V/20 kV substations and underground networks; children with the lowest exposure and the lowest number of electric networks in the vicinity. 63–225 kV underground networks within 20 m and 400 V/20 kV overhead lines within 40 m played a marginal role in differentiating exposure clusters. Cluster analysis is a viable approach to discovering variables best characterizing the exposure scenarios and thus it might be potentially useful to better tailor epidemiological studies. The present study did not assess the impact of indoor sources of exposure, which should be addressed in a further study.

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Kochunov, Yuriy Aleksandrovich, Artem Aleksandrovich Yagodkin, and Roman Aleksandrovich Nikiforov. "Analysis of performance of supporting structures of 6–10 kV overhead lines." Herald of the Ural State University of Railway Transport, no. 1 (2016): 123–31. http://dx.doi.org/10.20291/2079-0392-2016-1-123-131.

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Huang, Mingfeng, Lieyang Wu, Qing Xu, Yifan Wang, Wenjuan Lou, and Rong Bian. "Bayesian Approach for Typhoon-Induced Fragility Analysis of Real Overhead Transmission Lines." Journal of Engineering Mechanics 146, no. 9 (September 2020): 04020092. http://dx.doi.org/10.1061/(asce)em.1943-7889.0001816.

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Seri, Osami, Daisuke Miogi, and Kohki Satoh. "Corrosion Behavior of Aluminum Wire for Overhead Transmission Lines: Investigation and Analysis." Electrical Engineering in Japan 185, no. 4 (August 20, 2013): 18–24. http://dx.doi.org/10.1002/eej.22486.

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GRĄKOWSKI, Łukasz. "Statistical Analysis and Modeling of the Reliability of Overhead Low Voltage Lines." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 12 (December 5, 2019): 263–66. http://dx.doi.org/10.15199/48.2019.12.59.

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Ramirez-Vazquez, Isaias, and Fermin P. Espino-Cortes. "Electric-Field Analysis of Spacer Cable Systems for Compact Overhead Distribution Lines." IEEE Transactions on Power Delivery 27, no. 4 (October 2012): 2312–17. http://dx.doi.org/10.1109/tpwrd.2012.2209186.

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Lauria, D., G. Mazzanti, and S. Quaia. "The Loadability of Overhead Transmission Lines—Part I: Analysis of Single Circuits." IEEE Transactions on Power Delivery 29, no. 1 (February 2014): 29–37. http://dx.doi.org/10.1109/tpwrd.2013.2279609.

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Amoon, Aryana T., Catherine M. Crespi, Anders Ahlbom, Megha Bhatnagar, Isabelle Bray, Kathryn J. Bunch, Jacqueline Clavel, et al. "Proximity to overhead power lines and childhood leukaemia: an international pooled analysis." British Journal of Cancer 119, no. 3 (May 29, 2018): 364–73. http://dx.doi.org/10.1038/s41416-018-0097-7.

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Hao, Bing, and Li Zhi. "Wire Suspension System Based on Fault Tree Analysis Running Condition Assessment." Advanced Materials Research 986-987 (July 2014): 1401–4. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1401.

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Overhead transmission lines is an important part in the power system and the lifeblood of the transmission system.Important element of the transmission line conductor suspension system namely conductor and insulator, hardware.This paper, by using the fault tree analysis method, establishes the mathematical model of the transmission line conductor suspension system running condition assessment, reliably evaluates the running status of system, find out the weak links and the problems of the various parts, for the evaluation and maintenance of overhead transmission line provide theoretical support.

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Ju, Yan Zhong, Xin Ying Wang, Jun Feng Bai, and Wen Bin Zhou. "The Temperature Rise Analysis of the Old Conductors." Advanced Materials Research 805-806 (September 2013): 1058–61. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.1058.

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In order to study the conduction performance of the old transmission lines, we carried out a comparative study by testing the heat dissipation of the old and the new overhead conductors (35 kV aluminium cable steel reinforced (ACSR) lines, LGJ70/10). The temperature variation of two distinct types of lines under the identical current flow was investigated in details theoretically and experimentally. Our extensive experiments show that the temperature rise of old lines is higher about 11% than those of new lines with the same current flow of 255 A. By combining the theoretical analysis and experimental observations, it is concluded that the heat radiated power of the old lines is higher about 46% than that of new lines, such high radiated heat power is the main factor affecting the temperature rise of old lines.

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Mestriner, Daniele, and Massimo Brignone. "Corona Effect Influence on the Lightning Performance of Overhead Distribution Lines." Applied Sciences 10, no. 14 (July 17, 2020): 4902. http://dx.doi.org/10.3390/app10144902.

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Overhead distribution lines can be seriously damaged from lightning events because both direct and indirect events can cause flashovers along the line. The lightning performance of such power lines is usually computed neglecting the effect of corona discharge along the conductors: in particular, the corona discharge determined by the indirect lightning event is taken into account only by few researchers because it can have meaningful impacts only in few cases. However, when we deal with overhead distribution lines with high Critical Flashover value (CFO) and small diameters, the corona discharge caused by indirect events has to be taken into account. This paper shows the effects of corona discharge in the lightning performance computation of overhead distribution lines. The analysis will involve different configurations in terms of line diameter and air conditions, focusing on the negative effect of corona discharge in the number of dangerous events that determine line flashovers.

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Papadopoulos, Theofilos A., Andreas I. Chrysochos, Christos K. Traianos, and Grigoris Papagiannis. "Closed-Form Expressions for the Analysis of Wave Propagation in Overhead Distribution Lines." Energies 13, no. 17 (September 1, 2020): 4519. http://dx.doi.org/10.3390/en13174519.

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The calculation of the influence of the imperfect earth on overhead conductors is an important issue in power system analysis. Rigorous solutions contain infinite integrals; thus, due to their complex form, different simplified closed-form expressions have been proposed in the literature. This paper presents a detailed analysis of the effect of different closed-form expressions on the investigation of the wave propagation of distribution overhead lines (OHLs). A sensitivity analysis is applied to determine the most important properties influencing the calculation of the OHL parameters. The accuracy of several closed-form earth impedance models is evaluated as well as the influence of the displacement current and imperfect earth on the shunt admittance, which are further employed in the calculation of the propagation characteristics of OHLs. The frequency-dependence of the soil electrical properties, as well as the application of different modal decomposition algorithms, are also investigated. Finally, results on the basis of frequency-domain signal scans and time-domain electromagnetic transient responses are also discussed.

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