Journal articles: 'Overhead medium voltage line'

1

Lazaropoulos, Athanasios G., and Panayiotis G. Cottis. "Capacity of Overhead Medium Voltage Power Line Communication Channels." IEEE Transactions on Power Delivery 25, no. 2 (April 2010): 723–33. http://dx.doi.org/10.1109/tpwrd.2009.2034907.

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Liu, Song, and Larry J. Greenstein. "Interference Evaluation of Overhead Medium-Voltage Broadband Power Line Systems." IEEE Transactions on Electromagnetic Compatibility 52, no. 4 (November 2010): 866–77. http://dx.doi.org/10.1109/temc.2010.2075934.

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Lazaropoulos, Athanasios G., and Panayiotis G. Cottis. "Transmission Characteristics of Overhead Medium-Voltage Power-Line Communication Channels." IEEE Transactions on Power Delivery 24, no. 3 (July 2009): 1164–73. http://dx.doi.org/10.1109/tpwrd.2008.2008467.

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Giełdziński, Krzysztof. "Mobile robot moving on the overhead power line medium and high voltage." Pomiary Automatyka Robotyka 18, no. 9 (September 10, 2014): 84–90. http://dx.doi.org/10.14313/par_211/84.

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El-Sayed Gouda, Osama, and Noura Ahmed Elshesheny. "Simulation of the Lightning Back-Flashover for Medium Voltage Distribution Network." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (August 1, 2016): 264. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp264-272.

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Lightning strikes represent a considerable cause of short interruptions in electrical overhead line networks. The over voltages caused by lightning cannot be avoided but their influence can be limited by appropriate over voltage protection. This paper presents analysis study on some factors affecting the back flashover of Egyptian 66 kV distribution lines using Alternative Transient Program (ATP). The study includes the modeling of 66 kV distribution lines, the effects of magnitude and the front and tail times of lightning wave on the back flashover voltages, the effects of the striking distance, and the using of counterpoise wires on the back flashover on the 66 kV line towers. In this paper the 66 kV lines sag is neglected and the soil ionization by the flow of the stroke current is considered.

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Zhang, Qi, Bihua Zhou, Jianbao Wang, and Cheng Gao. "Full-Wave Analysis of Field-to-Line Coupling Effects Using 1D FDTD Method under Exciting Source with Different Bandwidths." Mathematical Problems in Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/890181.

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With the aim to analyze field-to-line coupling effects based on energy spectrum, parallel finite-difference time-domain (FDTD) method is applied to calculate the induced voltage on overhead lines under high-power electromagnetic (HPEM) environment. Firstly, the energy distribution laws of HEMP (IEC 61000-2-9), HEMP (Bell Laboratory), HEMP (Paulino et al., 2010), and LEMP (IEC61000-4-5) are given. Due to the air-earth stratified medium, both the absorbing boundary and the connecting boundary applied to scattering by finite-length objects are separately set in aerial and underground parts. Moreover, the influence of line length on induced voltage is analyzed and discussed. The results indicate that the half-peak width is wider with the increase of the line length. But the steepness of induced voltage on the overhead line is invariable. There is no further increase in the peak of induced voltage especially when the line length increases to be equivalent to the wavelength of the frequency bands with the maximum energy.

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Vantuch, Tomáš, Michal Prílepok, Jan Fulneček, Roman Hrbáč, and Stanislav Mišák. "Towards the Text Compression Based Feature Extraction in High Impedance Fault Detection." Energies 12, no. 11 (June 5, 2019): 2148. http://dx.doi.org/10.3390/en12112148.

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High impedance faults of medium voltage overhead lines with covered conductors can be identified by the presence of partial discharges. Despite it is a subject of research for more than 60 years, online partial discharges detection is always a challenge, especially in environment with heavy background noise. In this paper, a new approach for partial discharge pattern recognition is presented. All results were obtained on data, acquired from real 22 kV medium voltage overhead power line with covered conductors. The proposed method is based on a text compression algorithm and it serves as a signal similarity estimation, applied for the first time on partial discharge pattern. Its relevancy is examined by three different variations of classification model. The improvement gained on an already deployed model proves its quality.

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Saeed, Ismael, and Kamal Sheikhyounis. "Modeling Features of a Single Phase-to-Earth Fault in a Medium Voltage Overhead Transmission Line." UKH Journal of Science and Engineering 4, no. 2 (December 31, 2020): 127–38. http://dx.doi.org/10.25079/ukhjse.v4n2y2020.pp127-138.

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The modeling and calculation of a single phase-to-earth fault of 6 to 35 kV have specific features when compared with circuits with higher nominal voltages. In this paper, a mathematical analysis and modeling of a 3-phase overhead transmission line with distributed parameters consisting of several nominal T-shaped, 3-phase links with concentrated parameters replaced by 1 nominal T-shaped link were carried out. Further analysis showed that not accounting for the distributed nature of the line parameters did not cause significant errors in the assessment of the maximum overvoltage in the arc suppression in single phase-to-earth faults, and that sufficient accuracy insures the representation of the line by only 1 nominal T-shaped, 3-phase link. Such a modeling technique makes it impossible to identify the location of single-phase faults, which is the property of higher harmonic amplification of individual frequencies. Chain equivalent schemas with constant parameters are valid for a single frequency, thereby providing an opportunity to study the nature of the wave process by the discrete selection of parameters. Next in the mathematical representation, we consider the overhead transmission lines as lines with distributed parameters.

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Kratky, Michal, Stanislav Misak, Petr Gajdos, Petr Lukas, Radim Baca, and Peter Chovanec. "A Novel Method for Detection of Covered Conductor Faults in Medium Voltage Overhead Line Systems." IEEE Transactions on Industrial Electronics 65, no. 1 (January 2018): 543–52. http://dx.doi.org/10.1109/tie.2017.2716861.

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Borisov, Ruslan K., Sergey S. Zhulikov, Sergey I. Khrenov, Yuliya S. Turchaninova, Mikhail A. Koshelev, Sergey V. Belousov, Igor S. Makukha, Oleg Yu Trofimov, and Elena V. Ilyina. "Development of a Stand for Demonstration of Human Injury by Touch and Step Voltages Near a 10 kV Overhead Line." Vestnik MEI 6, no. 6 (2020): 39–45. http://dx.doi.org/10.24160/1993-6982-2020-6-39-45.

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An objective to develop a labor protection engineering stand was set forth as part of the research and development work "Carrying out theoretical and experimental investigations and development of stands for demonstrating the danger of electric shock at a training ground" for visually demonstrating the danger of injuring a person by touch and step voltages in 3…35 kV medium voltage electric networks. The technical solutions for practically implementing the stand were adopted based on an analysis of regulatory documents, conditions under which dangerous touch and step voltages occur, the most typical human injury cases, and calculation results. Specialists of the National Research University Moscow Power Engineering Institute Department of High Voltage Engineering and Electrophysics, working jointly with specialists of PJSC Rosseti Moscow Region have developed, manufactured, tested, and put into operation a stand for demonstrating human injury by the touch and step voltages when a 10 kV wire falls on the ground, on a car, and when a fault of a live wire on the overhead line support occurs. With the stand having been put in use at the PJSC Rosseti Moscow Region Training Center Ground, this will allow the staff to form a clear understanding of the electric shock danger, to focus on the effects caused by voltage and current, and thereby significantly reduce electrical injuries.

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Lazaropoulos, Athanasios G. "Review and Progress towards the Capacity Boost of Overhead and Underground Medium-Voltage and Low-Voltage Broadband over Power Lines Networks: Cooperative Communications through Two- and Three-Hop Repeater Systems." ISRN Electronics 2013 (March 28, 2013): 1–19. http://dx.doi.org/10.1155/2013/472190.

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This paper reviews and analyzes the broadband capacity and the coexistence potential of overhead and underground medium-voltage/broadband over power lines (MV/BPL) and low-voltage/broadband over power lines (LV/BPL) topologies when one and two repeaters are additively deployed between their existing transmitting and receiving ends (overhead and underground MV/BPL and LV/BPL topologies with two- and three-hop repeater system, respectively). The contribution of this paper is four fold. First, the factors that influence the broadband capacity performance of overhead and underground MV/BPL and LV/BPL topologies with multihop repeater systems are identified, namely the number of repeaters, the distribution power grid type—either overhead or underground, either MV or LV, the initial distribution BPL topology, the multiconductor transmission line configuration, and coupling scheme applied. Second, the well-validated applicability of two-hop repeater systems is now extended in overhead and underground LV/BPL and MV/BPL networks. The significant mitigating role of two-hop repeater systems against capacity losses due to aggravated topologies or different coupling schemes is verified. Third, the deployment upgrade of two- to three-hop repeater systems in distribution BPL topologies is first examined in terms of broadband capacity performance. To study the occurred capacity improvement, suitable capacity contour plots are first proposed. Fourth, multi-hop repeater systems are identified as valuable technology solution so that the required intraoperability between overhead and underground MV/BPL and LV/BPL networks, which is a prerequisite condition before BPL systems symbiosis with other broadband technologies (interoperability), is promoted.

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Dai, Yun Hong, Shi Bin Liang, Ming Yao Hu, Ying Na Li, Zhen Gang Zhao, Tao Xie, Qing Sheng Tian, and Chuan Li. "The Method Analysis of Overhead Transmission Line Single-Phase Grounding Fault Detection and Location." Advanced Materials Research 1030-1032 (September 2014): 1360–65. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1360.

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Small current grounding power system is widely used in overhead transmission line in medium voltage distribution network in China. Because of its long lines, branch, space truss structure is complex, low level of automation, It is easily influenced by outside force and the natural environment, and single-phase grounding failure rate is high. It is an important topic to quickly and accurately detect the location of the fault line, and improve the reliability of power supply and distribution system.This paper has carried on the induction and the comparison of various fault detection and location method of overhead transmission line which is currently used in single phase to ground, and analyzed their advantages and disadvantages,given the corresponding conclusions, provided the reference for finding out the reasonable single-phase earth fault location method or improvement.

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Lazaropoulos, Athanasios G. "Towards Modal Integration of Overhead and Underground Low-Voltage and Medium-Voltage Power Line Communication Channels in the Smart Grid Landscape: Model Expansion, Broadband Signal Transmission Characteristics, and Statistical Performance Metrics (Invited Paper)." ISRN Signal Processing 2012 (October 16, 2012): 1–17. http://dx.doi.org/10.5402/2012/121628.

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The established statistical analysis, already used to treat overhead transmission power grid networks, is now implemented to examine the factors influencing modal transmission characteristics and modal statistical performance metrics of overhead and underground low-voltage/broadband over power lines (LV/BPL) and medium-voltage/broadband over power lines (MV/BPL) channels associated with power distribution in smart grid (SG) networks. The novelty of this paper is threefold. First, a refined multidimensional chain scattering matrix (TM2) method suitable for overhead and underground LV/BPL and MV/BPL modal channels is evaluated against other relative theoretical and experimental proven models. Second, applying TM2 method, the end-to-end modal channel attenuation of various LV/BPL and MV/BPL multiconductor transmission line (MTL) configurations is determined. The LV/BPL and MV/BPL transmission channels are investigated with regard to their spectral behavior and their end-to-end modal channel attenuation. It is found that the above features depend drastically on the frequency, the type of power grid, the mode considered, the MTL configuration, the physical properties of the cables used, the end-to-end distance, and the number, the electrical length, and the terminations of the branches encountered along the end-to-end BPL signal propagation. Third, the statistical properties of various overhead and underground LV/BPL and MV/BPL modal channels are investigated revealing the correlation between end-to-end modal channel attenuation and modal root-mean-square delay spread (RMS-DS). Already verified in the case of overhead high-voltage (HV) BPL systems, this fundamental property of several wireline systems is also modally validated against relevant sets of field measurements, numerical results, and recently proposed statistical channel models for various overhead and underground LV/BPL and MV/BPL channels. Based on this common inherent attribute of either transmission or distribution BPL networks, new unified regression trend line is proposed giving a further boost towards BPL system intraoperability. A consequence of this paper is that it aids in gaining a better understanding of the range and coverage that BPL solutions can achieve; a preliminary step toward the system symbiosis between BPL systems and other broadband technologies in an SG environment.

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Mahmood, Farhan, Mohammad E. M. Rizk, N. A. Sabiha, and Matti Lehtonen. "Flashover Probability Distribution and Volt-Time Curves of Medium Voltage Overhead Line Insulation Under Combined AC and Lightning Impulse Voltages." International Review of Electrical Engineering (IREE) 10, no. 5 (October 31, 2015): 625. http://dx.doi.org/10.15866/iree.v10i5.7150.

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Landini, Marco, Giovanni Mazzanti, and Riccardo Mandrioli. "Procedure for Verifying Population Exposure Limits to the Magnetic Field from Double-Circuit Overhead Power Lines." Electricity 2, no. 3 (September 12, 2021): 342–58. http://dx.doi.org/10.3390/electricity2030021.

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The verification of the limits of the population’s exposure to the magnetic field generated by double-circuit power lines from field measurements carried out on site is not trivial. It requires knowledge of the power line current instant values during the measurement period, the determination of the relationship between current and field at the measurement points (made more complex by the double-circuit overhead line configuration) and the use of that relationship to extrapolate the field values. Nevertheless, the verification of exposure limits for double-circuit power lines from on-site measurements is often conducted with rough, or not particularly stringent, procedures. A practical and straightforward procedure of general validity for non-optimized double-circuit lines is proposed here. No specific measurement position or conductors disposition knowledge is required as well as no complex three-dimensional finite element method code is necessary. The procedure, potentially also applicable to high- and extra-high-voltage lines, is validated on a medium-voltage (15 kV) double-circuit overhead power line study case. Exposure limits assessment suggests that if the line is operated at its rated capacity (230/285 A), the 3 μT quality target is missed. Results are provided with a 95% confidence interval ranging from ±100 nT to ±140 nT in all the cases.

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Lazaropoulos, Athanasios. "Main Line Fault Localization Methodology in Smart Grid – Part 1: Extended TM2 Method for the Overhead Medium-Voltage Broadband over Power Lines Networks Case." Trends in Renewable Energy 3, no. 3 (October 2017): 2–25. http://dx.doi.org/10.17737/tre.2017.3.3.0036.

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Naumov, I. V., and D. N. Karamov. "On damage rate of overhead power transmission lines in power supply systems." Safety and Reliability of Power Industry 14, no. 2 (July 28, 2021): 92–99. http://dx.doi.org/10.24223/1999-5555-2021-14-2-92-99.

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The purpose of the article is to analyze the damage rate of overhead power transmission lines (OPL) in medium-voltage electrical distribution networks of the Irkutsk region. The established International Indices that determine the level of reliability of the functioning of electric networks are considered, and information on the compliance of the condition of electric networks in Russia with these indices is analyzed. Analytical information on the damage rate of elements of these networks and their causes in Europe, America, and Russia is presented. The emphasis is placed on the fact that the most common damage is characteristic of overhead power lines, especially 6–10 kV lines. As an object of research, two branches of the Irkutsk electric grid company (IEC) were taken, one of which provides electricity to rural consumers, the other — mainly to consumers residing in the territory of the city Irkutsk. The characteristics of these electric networks, their territorial location and basic technical data are presented. To conduct analytical monitoring of the level of reliability of overhead power transmission lines, logs of disconnection of the Eastern and Southern electric networks of the IEC over a long-term period were used. On the basis of this information, tables of failures and their consequences in the studied electrical networks were compiled for monthly average data over the period under examination for various causes of damage. To plot time diagrams of the parameters under examination, computer programs were compiled in the Matlab system, the use of which made it possible to obtain visualization of changes in failures for various reasons for the electrical networks under consideration. The information on the time of power supply interruptions in these networks, as well as the amount of electricity underutilized by consumers during these interruptions and its cost are analyzed. It is shown that in the electric networks under consideration, most of the power failures are related to the territorial dispersion of these networks, and the low level of equipment controls and insufficient qualification of operating personnel, as evidenced by the significant number of failures for unknown reasons. Besides, a significant part of the failures is due to damage to the overhead line wires, switching equipment and the effect of wind load. Recommendations for improving the condition of power transmission lines and a number of measures aimed at improving the level of reliability of power supply are presented.

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Granyak, Valeriy. "MATHEMATICAL MODEL OF OVERHEAD PARAMETRIC EDDY CURRENT PRIMARY MEASURING TRANSDUCER OF ABSOLUTE MOVEMENT." Vibrations in engineering and technology, no. 2(97) (August 27, 2020): 123–28. http://dx.doi.org/10.37128/2306-8744-2020-2-13.

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To date, even in the developed countries of Europe, more than 50% of the power generating equipment of hydropower plants have worked their design life. In the CIS countries, the percentage of such equipment is even higher. The complete replacement of such equipment requires a large amount of investment, while a significant part of the latter has a satisfactory technical condition for the further extension of the service life. However, with an increase in the operating time of every electrical equipments, the probability of its failure inevitably increases, which can lead to significant material losses and to a significant danger to the life and health of the power plant personnel. Therefore, in view of the foregoing, monitoring and early diagnosis systems, which are entrusted with the protection function of both hydraulic turbines and auxiliary power equipment, are becoming increasingly relevant. One of the most promising methods of technical control and diagnostics of hydraulic units is the analysis of their vibro-acoustic characteristics. Including the axial component. However, a significant technical problem that arises in the construction of such systems is the limited use of known absolute vibration displacement sensors due to the lack of their high-precision mathematical models. In the article a mathematical model of an overhead parametric eddy current primary measuring transducer of absolute displacement has been developed. It is shown that both the effective value of the output current and the shift of its initial phase are found to be functionally dependent on the distance between the sensor and the conductive medium with a stable supply voltage. It has been established that, while ensuring acceptable overall dimensions, this sensor has sufficient sensitivity to convert the displacement to the effective (amplitude) value of the output current, which is constant in the range of movement from 0 to 5 mm, to ensure the required measurement accuracy.

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Zhao, Hongshan, Weitao Zhang, and Yan Wang. "An Effective Method to Calculate Frequency Response of Distribution Networks for PLC Applications." Electronics 8, no. 6 (June 9, 2019): 649. http://dx.doi.org/10.3390/electronics8060649.

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Modelling and estimating power-line communication (PLC) channels are complicated issues due to the complex network topologies, various junctions, and changeable loads. This paper focuses on the frequency response characteristics (FRCs) of medium-voltage (MV) PLC networks with special consideration of two scenarios that are often neglected but generally exist. In the first scenario, the MV distribution network is of the ring topology. In the second scenario, the MV overhead lines and underground cables join at junctions, and the shields of underground cables are grounded with nonzero grounding impedances at the junctions. These conditions lead to the failure of currently popular methods to different degrees. For this reason, we developed an effective method to calculate the FRCs of distribution networks for PLC applications. With this method, the frequency responses of nodes are simply expressed as the binary function of the overall tube propagation matrix and overall node scattering matrix, which is convenient for calculations and analyses. The proposed method was validated by the agreement between the calculated and measured FRCs. The results of two test examples showed that the proposed method performed better in comparison with the traditional approximate method when nonideal grounding conditions were taken into account. The proposed method is also independent of the network topology, so it can adapt to the dynamic changes of the network structure.

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Gatta, Fabio, Alberto Geri, Stefano Lauria, and Marco Maccioni. "An Equivalent Circuit for the Evaluation of Cross-Country Fault Currents in Medium Voltage (MV) Distribution Networks." Energies 11, no. 8 (July 24, 2018): 1929. http://dx.doi.org/10.3390/en11081929.

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A Cross-Country Fault (CCF) is the simultaneous occurrence of a couple of Line-to-Ground Faults (LGFs), affecting different phases of same feeder or of two distinct ones, at different fault locations. CCFs are not uncommon in medium voltage (MV) public distribution networks operated with ungrounded or high-impedance neutral: despite the relatively small value of LGF current that is typical of such networks, CCF currents can be comparable to those that are found in Phase-To-Phase Faults, if the affected feeder(s) consists of cables. This occurs because the faulted cables’ sheaths/screens provide a continuous, relatively low-impedance metallic return path to the fault currents. An accurate evaluation is in order, since the resulting current magnitudes can overheat sheaths/screens, endangering cable joints and other plastic sheaths. Such evaluation, however, requires the modeling of the whole MV network in the phase domain, simulating cable screens and their connections to the primary and secondary substation earth electrodes by suitable computer programs, such as ATP (which is the acronym for alternative transient program) or EMTP (the acronym for electromagnetic transient program), with substantial input data being involved. This paper presents a simplified yet accurate circuit model of the faulted MV network, taking into account the CCF currents’ return path (cable sheaths/screens, ground conductors, and earthing resistances of secondary substations). The proposed CCF model can be implemented in a general-purpose simulation program, and it yields accurate fault currents estimates: for a 20 kV network case study, the comparison with accurate ATP simulations evidences mismatches mostly smaller than 2%, and never exceeding 5%.

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Kachanov, A. N., D. A. Korenkov, A. A. Revkov, V. V. Maksimov, and O. V. Vorkunov. "Words high-frequency drying processes simulation of wooden tangent towers in a vacuum chamber." Power engineering: research, equipment, technology 22, no. 6 (March 26, 2021): 130–42. http://dx.doi.org/10.30724/1998-9903-2020-22-6-130-142.

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THE PURPOSE. The service life duration of wooden tangent towers used on overhead transmission lines with a voltage of up to 35 kV depends on the quality of lumber drying and subsequent impregnation. The drying of tangent tower workpieces is currently carried out by atmospheric or convective methods and is the longest and one of the energy-consuming stages of their production. At the same time, there are promising electrotechnological drying installations that can reduce the duration and improve drying quality at comparable specific energy costs. Such installations include vacuum high-frequency complexes, the wide introduction of which is complicated by a number of unresolved scientific and technical problems like optimizing vacuum high-frequency drying modes and ensuring electromagnetic field uniformity in long workpieces. The purpose of this article is to obtain mathematical tools that simultaneously describe the cross-effects of electromagnetic phenomena and heat and mass transfer processes in long-sized lumber and contribute to the further solution of these problems. METHODS. The positions of the theory of electromagnetic field, heat mass transfer and heat mass exchange, methods of mathematical modeling were used for this purpose. Also the results of previous studies of electromagnetic field distribution in the cross-section and longitudinal sections of the working chamber loading are taken into account. RESULTS. А one-dimensional mathematical model is obtained. It describes the influence of electromagnetic wave distribution along the length of tangent towers and external medium parameters on the temperature and moisture content in the material. This model is characterized by the possibility of using simple algorithms for analyzing differential equation systems based on the finite differe nce method and requiring less initial data on the drying material properties. CONCLUSION. The obtained by using the proposed model and the method of its analysis the numerical study results are compared with the available experimental data. Based on this comparison it is concluded that the obtained model is adequate and more effective relative to other existing models of vacuum high-frequency drying. Generally, further use of the presented mathematical toolkit to optimize the design and modes of vacuum-high-frequency complexes in the task of drying wooden tangent towers will increase the reliability of overhead transmission lines.

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Bragatto, Tommaso, Alberto Cerretti, Luigi D’Orazio, Fabio Massimo Gatta, Alberto Geri, and Marco Maccioni. "Thermal Effects of Ground Faults on MV Joints and Cables." Energies 12, no. 18 (September 11, 2019): 3496. http://dx.doi.org/10.3390/en12183496.

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In recent years, an anomalous increase of faults in underground medium voltage (MV) cable lines has been recorded in Italy, especially during summer; the largest number of faults affected cable joints. The assessment of joint thermal stress, both in normal operation and during faults, is paramount. The study presented in this paper focuses on cable heating effects due to short circuit currents flowing through cable screens during ground faults (e.g., in case of cross country faults, CCFs, whose current values are comparable to line-to-line short circuit), considering the contact resistance (CR) between cable screens and copper stocking due to inaccurate joint manufacturing. A thermal model, already developed and discussed by the authors in previous papers, has been extended and applied in this study in order to assess the CR effects in cable and joint heating during failures. Parametric studies have been carried out on a typical cable-joint system, varying fault current and CR values, as well as considering protection schemes normally adopted by distribution system operators (DSOs) in Italian MV distribution grids. Results show that for CR values larger than few milliohms, fault currents due to CCFs are able to overheat the joint well beyond the maximum tolerable temperature of insulation, thus leading to cable failures when the shortest fault clearing times (i.e., 120 ms) are considered.

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Dobrynin, E. V., T. V. Boshkareva, and O. V. Tabakov. "An Overhead Line Voltage Monitoring System." Russian Electrical Engineering 91, no. 3 (March 2020): 191–94. http://dx.doi.org/10.3103/s1068371220030074.

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Boucher, Jacques, and Marc Lescure. "Remote control for an overhead high-voltage line." Sensors and Actuators 13, no. 4 (April 1988): 365–74. http://dx.doi.org/10.1016/0250-6874(88)80049-0.

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Yang, Lin, Kai Quan Xia, Fan Liu, Xi Chun Ren, and Yuan Shi Deng. "Atmospheric Corrosion Study on High-Voltage Overhead Power Transmission Line." Applied Mechanics and Materials 291-294 (February 2013): 2313–16. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2313.

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Influence of atmosphere corrosion on conductor in the high-voltage overhead power transmission line has been paid more and more attention. This paper carries out experimental test research on atmosphere corrosion forms of aged conductor wires through metallographic analysis, electron microscope scanning etc. technologies, analyzing the influence of corrosion on its mechanical performance, which has provided theoretical reference for operation and maintenance of the overhead power transmission line.

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Zhou, Hua Min, Hao Wu, Yu Sheng Quan, and Zi Jian Wang. "New Method of Overhead Line Icing Online Monitoring." Applied Mechanics and Materials 672-674 (October 2014): 1369–72. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1369.

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Present icing monitoring system mainly depends on detecting the meteorological parameters and dynamic characteristics of the structure of the overhead icing line. However, all these systems need additional equipments for data collection. This paper provides a new method based on voltage and current of both ends of the line and discriminates the icing region and its severity via the change of active power and reactive power. It requires the voltage and current serving as signal source which is provided by the data collecting device on the both ends of lines. In this way it can accomplish the Monitoring task of icing transmission.

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GORSHKOV, Andrey V. "Determining the Protective Grounding Conductor Impedance to Ensure Safety in Carrying out Work on the Disconnected Power Line." Elektrichestvo 10, no. 10 (2020): 12–19. http://dx.doi.org/10.24160/0013-5380-2020-10-12-19.

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It is proposed to ensure safety in carrying out work on a disconnected overhead power line by using a grounding conductor at the workplace having the impedance at which the induced voltage will be decreased down to permissible values. For reliably determining the necessary grounding conductor impedance, the results from multiple measurements of the induced voltage and current at the overhead power line point in which the work is carried out are used. Based on the results of measurements and solution of the inverse problems, empirical formulas for the functions of induced voltage and current in the considered place at which work on the overhead power line is carried out are determined. The necessary impedance of the grounding conductor at the workplace is determined using the obtained empirical formulas. As a result, a procedure has been developed using which it is possible to determine the grounding conductor impedance that ensures safety of work carried out at the considered place of the disconnected overhead power line whatever the combination of operating currents through the influencing overhead power lines.

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GORSHKOV, Andrey V., Ilya V. KOROLEV, and Olga S. SHCHERBACHEVA. "On the Problem of Reliably Determining the Induced Voltage on a Disconnected Power Line." Elektrichestvo 5, no. 5 (2021): 17–25. http://dx.doi.org/10.24160/0013-5380-2021-5-17-25.

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An analysis of the current regulatory documents on electrical safety shows that the methodological guidelines for determining the induced voltage on disconnected overhead power lines (OHL) located near the operating OHL contain methodological and methodological errors. These errors can lead to a significant underestimation of the determined induced voltage. It has been established that the method specified in the regulatory documents for determining the maximum possible value of the induced voltage by means of a single measurement with subsequently multiplying the measured value by a certain recalculation factor k does not allow in principle to determine it reliably. To determine a reliable value at a certain point of the disconnected overhead line, in general, it is necessary to measure the induced voltage at the same point of the overhead line at different values of the currents affecting the overhead line. The article formulates the main and auxiliary tasks of determining the reliable values of the maximum possible induced voltage. The main principles of the methods for solving the stated tasks are considered.

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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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Zhang, Xiu Bin, Ding Jun Wen, Ya Ming Sun, and Hong Gang Chen. "Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line." Applied Mechanics and Materials 556-562 (May 2014): 1588–91. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1588.

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Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.

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Dong, Ai Hua, Xin Lin Geng, Yi Yang, Ying Su, and Meng Yao Li. "Overhead Power Line Fault Positioning System." Applied Mechanics and Materials 329 (June 2013): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amm.329.299.

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Aimed at the situations of the low accuracy of overhead line fault detection and the high cost of line fault information transmission with the aid of GSM correspondence network, this paper introduces overhead line fault detection and location system as the core of industrial computer. The combination of software and hardware, the methods of current rate of change and zero current detection are used, and so the accuracy of short circuit fault detection is improved. The features of ground phase voltage drop and the 5th harmonic current are integrated, and the accuracy of ground fault detection circuit is improved. Zigbee wireless communication technology is used to make into independent signal transmission system, which not only reduces the system's operating costs but also ensures the reliable transmission of signals. Taking Kingview 6.51 software as development platform, the monitoring program and display with many functions are designed. The system has been put into operation, running in good condition, and passed concluding and acceptance smoothly.

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Alanzi, Sultan Sh, and Rashad M. Kamel. "Photovoltaic Maximum Penetration Limits on Medium Voltage Overhead and Underground Cable Distribution Feeders: A Comparative Study." Energies 14, no. 13 (June 25, 2021): 3843. http://dx.doi.org/10.3390/en14133843.

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This paper investigates the maximum photovoltaic (PV) penetration limits on both overhead lines and underground cables medium voltage radial distribution system. The maximum PV penetration limit is estimated considering both bus voltage limit (1.05 p.u.) and feeder current ampacity (1 p.u.). All factors affect the max PV penetration limit are investigated in detail. Substation voltage, load percentage, load power factor, and power system frequency (50 Hz or 60 Hz) are analyzed. The maximum PV penetration limit associated with overhead lines is usually higher than the value associated with the underground cables for high substation voltage (substation voltage = 1.05 and 1.04 p.u.). The maximum PV penetration limit decreases dramatically with low load percentage for both feeder types but still the overhead lines accept PV plant higher than the underground cables. Conversely, the maximum PV penetration increases with load power factor decreasing and the overhead lines capability for hosting PV plant remains higher than the capability of the underground cables. This paper proved that the capability of the 60-Hz power system for hosting the PV plant is higher than the capability of 50 Hz power system. MATLAB software has been employed to obtain all results in this paper. The Newton-Raphson iterative method was the used method to solve the power flow of the investigated systems.

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33

Izadi, Mahdi, Mohd Zainal Abidin Ab Kadir, and Maryam Hajikhani. "On the Lightning Induced Voltage Along Overhead Power Distribution Line." Journal of Electrical Engineering and Technology 9, no. 5 (September 1, 2014): 1694–703. http://dx.doi.org/10.5370/jeet.2014.9.5.1694.

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34

Diendorfer, G. "Induced voltage on an overhead line due to nearby lightning." IEEE Transactions on Electromagnetic Compatibility 32, no. 4 (1990): 292–99. http://dx.doi.org/10.1109/15.59889.

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35

Michinaga, Katsuhisa, Naochika Higashi, Toshiro Sakuno, Masahide Yamaguchi, Masanori Maruyama, and Yoshiteru Hoshi. "Development of an Overhead Line Voltage Compensation System for Railways." Journal of the Japan Institute of Power Electronics 33 (2007): 187–93. http://dx.doi.org/10.5416/jipe2003.33.0_187.

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Quan, Yu Sheng, En Ze Zhou, Hua Gui Chen, and Xin Zhao. "New Methodology of On-Line Monitoring for High Voltage Overhead Transmission Line Icing." Advanced Materials Research 805-806 (September 2013): 871–75. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.871.

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In recent years,transmission lines icing leads to failure and accidents,such as large area ice flashover, fittings damaged, line dancing, pole (tower) failure, lines breakage even large-scale power outage, causing serious threat to grid. Nowadays, icing monitoring system mainly relies on detecting the meteorological parameters and the changes of dynamic characteristics for early warning, but the methodologies need additional equipment for data collection. In order to ensure the security and reliability of the grid, a safe, effective and economical methodology of monitoring transmission lines icing has great significance. The project proposed a Transmission Line Icing monitoring principle and algorithm, the method based only on the voltage and current from both ends of transmission lines can be generated dynamically monitoring criterion line icing. According to the criterion maximum, line icing center area, extent and severity can be recognized. The criterion of the method is used as a mathematical scanner, swept from one end of the line to the other end, comprehensive judgments are made on the basis of comprehensive criteria for integrated maximum value, thus the method has a high diagnostic accuracy and reliability. The methodology proposed in this paper is different from the current monitoring methodology; additional hardware devices are not required, and the methodology is simple and practical, has strong operability and enormous economic benefits, adapting to the requirements of the development of the smart grid.

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Fahad, Jabbar Qasim, and Riyadh Kamil Chillab. "Design aspects of high voltage transmission line." Bulletin of Electrical Engineering and Informatics 9, no. 3 (June 1, 2020): 853–61. http://dx.doi.org/10.11591/eei.v9i3.2062.

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The transmission lines are very important in the transmitted of electrical power, and the process of selecting the voltage of the line is an important task in the design and implementation process. The process of transferring electrical power from one side then onto the next place for long away. While maintaining the percentage regulation within the permissible limits is an important problem in the transfer of energy. In electrical transmission line there are important elements are resistance, inductance and capacitance. The purpose of this paper is to study and calculate economic high-tension voltage and selection of overhead line conductor ACSR.

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Токарский, A. Tokarskiy, Рубцова, and Nina Rubtsova. "Distribution of Voltage Induced by Parallel Transmission Line Along Dead and Grounded Line." Safety in Technosphere 4, no. 2 (April 25, 2015): 48–55. http://dx.doi.org/10.12737/11333.

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Calculation algorithm for Currents and voltages induced by electric field of operating overhead transmission line (OTL) along dead and grounded parallel OTL is presented. The data indicates the coincidence of the results of calculation under OTL parameters outside the "dead zone" obtained by Carson’ method and calculation with hequ method not having a "dead zone".

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Quan, Yu Sheng, Enze Zhou, Guang Chen, and Xin Zhao. "New Methodology of On-Line Monitoring for Transmission Line Galloping." Advanced Materials Research 805-806 (September 2013): 867–70. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.867.

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When the overhead transmission line is galloping, a variety of natural disasters occur on the role of the natural conditions, the vibration of conductor is one of the more serious harm to the power system. Over the past decade, as the construction of EHV and UHV, wire cross-section, tension, suspension height and span of overhead transmission lines are increasing, and hence the number of conductor vibration is significantly increased. Vibration in a large scale will led to frequent tripping or even broken line or tower collapses, which cause large area power failures and impact security and stability operation. Online monitoring method for overhead transmission line dancing is mostly needed to add additional equipment, however, once situated on the route environment overlying ice or high winds and other inclement weather, online monitoring is difficult to achieve. This paper presents a method, which is made correlation analysis based on the voltage and current acquired from both ends of the transmission lines, online monitoring of line galloping can be achieved.

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Mišák, Stanislav, Štefan Hamacek, and Mikołaj Bartłomiejczyk. "Verification of a Novel Method of Detecting Faults in Medium-Voltage Systems with Covered Conductors." Metrology and Measurement Systems 24, no. 2 (June 27, 2017): 277–88. http://dx.doi.org/10.1515/mms-2017-0020.

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AbstractThis paper describes the use of new methods of detecting faults in medium-voltage overhead lines built of covered conductors. The methods mainly address such faults as falling of a conductor, contacting a conductor with a tree branch, or falling a tree branch across three phases of a medium-voltage conductor. These faults cannot be detected by current digital relay protection systems. Therefore, a new system that can detect the above mentioned faults was developed. After having tested its operation, the system has already been implemented to protect mediumvoltage overhead lines built of covered conductors.

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Gouda, Osama E., and Dina M. Khalifa. "Online monitoring of medium voltage overhead distribution lines polluted insulators severity." CIRED - Open Access Proceedings Journal 2017, no. 1 (October 1, 2017): 372–75. http://dx.doi.org/10.1049/oap-cired.2017.0056.

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42

Terzija, V. V., and Z. M. Radojević. "Numerical algorithm for medium voltage overhead lines protection and adaptive autoreclosure." Electrical Engineering 85, no. 2 (January 29, 2003): 95–99. http://dx.doi.org/10.1007/s00202-002-0150-6.

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43

Olivieri, Carlo, Francesco de Paulis, Antonio Orlandi, Giorgio Giannuzzi, Roberto Salvati, Roberto Zaottini, Carlo Morandini, and Lorenzo Mocarelli. "Remote Monitoring of Joints Status on In-Service High-Voltage Overhead Lines." Energies 12, no. 6 (March 14, 2019): 1004. http://dx.doi.org/10.3390/en12061004.

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This work presents the feasibility study of an on-line monitoring technique aimed to discover unwanted variations of longitudinal impedance along the line (also named “impedance discontinuities”) and, possibly, incipient faults typically occurring on high voltage power transmission lines, like those generated by oxidated midspan joints or bolted joints usually present on such lines. In this paper, the focus is placed on the application and proper customization of a technique based on the time-domain reflectometry (TDR) technique when applied to an in-service high-voltage overhead line. An extensive set of numerical simulations are provided in order to highlight the critical points of this particular application scenario, especially those that concern the modeling of both the TDR signal injection strategy and the required high-voltage coupling devices, and to plan a measurement activity. The modeling and simulation approach followed for the study of either the overhead line or the on-line TDR system is fully detailed, discussing three main strategies. Furthermore, some measurement data that were used to characterize the specific coupling device selected for this application at high frequency—that is, a capacitive voltage transformer (CVT)—are presented and discussed too. This work sets the basic concepts underlying the implementation of an on-line remote monitoring system based on reflectometric principles for in-service lines, showing how much impact is introduced by the high-voltage coupling strategy on the amplitude of the detected reflected voltage waves (also named “voltage echoes”).

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Szultka, Agata, Seweryn Szultka, Stanislaw Czapp, and Ryszard Zajczyk. "Voltage Variations and Their Reduction in a Rural Low-Voltage Network with PV Sources of Energy." Electronics 10, no. 14 (July 7, 2021): 1620. http://dx.doi.org/10.3390/electronics10141620.

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Renewable sources of energy (RES), especially photovoltaic (PV) micro-sources, are very popular in many countries. This way of clean power production is applied on a wide scale in Poland as well. The Polish legal regulations and tariffs specify that every prosumer in a low-voltage network may feed this network with a power not higher than the maximum declared consumed power. In power networks with RES, the voltage level changes significantly along the power line and depends on the actually generated as well as consumed power by particular prosumers. There are cases that prosumers connected to this line cannot produce and inject the full permissible power from PV sources due to the level of a voltage higher than the technically acceptable value. In consequence, it leads to the lack of profitability of investments in installations with PV sources. In this paper, voltage variations in a real rural low-voltage network with PV micro-sources are described. The possible two general solutions of voltage levels improvement are discussed—increase in the cross-sectional area of the bare conductors in the existing overhead line as well as the replacement of the overhead line with a cable line. The recommended solution for the analyzed network, giving the best reduction of voltage variations and acceptable cost, is underlined. Such a recommendation can also be utilized in other rural networks.

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He, Yongping, Xiaomin Liu, Kai Yang, Shangke Liu, and Yaxuan Chen. "Research on Overhead Line Cost Prediction Based on Index Construction." E3S Web of Conferences 136 (2019): 01014. http://dx.doi.org/10.1051/e3sconf/201913601014.

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In order to meet the growing demand of the society for electric power, the construction of electric power infrastructure is constantly carried out. However, investment in construction and cost control are particularly important. Because of its own characteristics, overhead line project cost control management is difficult to carry out. According to the characteristics of overhead line engineering, this paper constructs an overhead line engineering cost index system composed of 24 indexes including voltage grade from three aspects: technical conditions, engineering quantity attribute and cost attribute. Combining with the actual data of the completed project, the BP neural network algorithm is used to predict the static investment of the project. The accuracy of the prediction model reaches 99.9%. This verifies the rationality and comprehensiveness of the overhead line project cost index system constructed in this paper, and provides reliable guidance for the overhead line project cost management.

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Demchenko, D., N. Rubcova, V. Ryabchenko, and A. Tokarskiy. "Distribution of Currents and Voltages, Induced by Electric Field of Three-Phase Overhead Transmission Line along the Grounded Phase/Cable of Disconnected Parallel Power Line." Safety in Technosphere 9, no. 1 (October 13, 2020): 31–40. http://dx.doi.org/10.12737/1998-071x-2020-31-40.

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The health maintenance of linemen working at overhead transmission lines under induced voltage requires compliance of these voltages’ limit values. To ensure compliance with these requirements have been developed algorithms for calculating of currents and voltages distribution along the grounded phase/cable of disconnected power line, induced by the electric field of operating three-phase overhead power line without transposition, with full and incomplete complete phases transposition section .

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Liu, Xiao Xia, Jun Wen, Wei Yang Yin, and Jia Liang Wen. "Comparison of External Insulation Level between AC and DC Overhead Transmission Lines." Applied Mechanics and Materials 347-350 (August 2013): 1353–57. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1353.

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It is important to choose suitable insulator strings that matching the voltage level when trying to change an AC transmission line into a DC one. Historically based, most published works discuss the way of determining the number or the length of insulators for overhead transmission lines, which mainly consider about voltage levels, pollution classes, insulator types and their pollution performances. It calls for too much work for a line restructuring project. In order to simplify the work, a comparison of the choosing of insulator strings between AC and DC overhead transmission line is made in this paper. Two main results are obtained. One is that the ratio, which defined as α, of the number of insulator on DC transmission line and that on AC transmission line ranges from 1 to 2.5 with the decreasing of voltage level under the same pollution class, the other is that the value α remains substantially constant under the same voltage level, and it will decrease slightly as the pollution class increases. The results provide theoretical basis for the choosing of insulator strings in line restructuring projects.

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48

Lazaropoulos, Athanasios G. "BROADBAND TRANSMISSION CHARACTERISTICS OF OVERHEAD HIGH-VOLTAGE POWER LINE COMMUNICATION CHANNELS." Progress In Electromagnetics Research B 36 (2012): 373–98. http://dx.doi.org/10.2528/pierb11091408.

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Podoltsev, О. D. "COMPUTER SIMULATION OF LIGHTNING OVERVOLTAGE IN HIGH VOLTAGE OVERHEAD TRANSMISSION LINE." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2017, no. 46 (April 28, 2017): 94–106. http://dx.doi.org/10.15407/publishing2017.46.094.

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Chervenkov, Atanas, and Todorka Chervenkova. "Investigation of the Influence of the Electromagnetic Field in the Vicinity of High Voltage Overhead Line." Materials Science Forum 856 (May 2016): 190–95. http://dx.doi.org/10.4028/www.scientific.net/msf.856.190.

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The magnetic and electrical field in the vicinity of overhead power line for high voltage - 220 kV is investigated. FEM model is created. Simulations of normal and emergency mode of the power line are made. The electrical intensity at idle mode in some areas, close to overhead power line, creates a high voltage level for humans. It can create also disturbances in the electrical equipment and the vehicles. These surges violate electromagnetic compatibility. The magnetic induction at emergency mode – short circuit and lightning strike in the areas around the towers could give a disturbing reaction of humans, animals and sensitive electronic devices. One solution for decreasing of the magnetic flux density to acceptable values is offered.

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Journal articles on the topic 'Overhead medium voltage line'

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