Relevant bibliographies by topics / Overhead conductors

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Overhead conductors'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Overhead conductors"

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Bedialauneta, Miren T., Igor Albizu, Elvira Fernandez, and A. Javier Mazon. "Uncertainties in the Testing of the Coefficient of Thermal Expansion of Overhead Conductors." Energies 13, no. 2 (January 14, 2020): 411. http://dx.doi.org/10.3390/en13020411.

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Overhead lines can be replaced by high temperature low sag (HTLS) conductors in order to increase their capacity. The coefficients of thermal expansion (CTE) of the HTLS conductors are lower than the CTE of conventional conductors. The utilities and conductor manufacturers usually carry out the verification of the CTE of the overhead conductors in an actual size span. The verification is based on the observation of the change of the conductor length as a result of the conductor temperature change. This process is influenced by the coefficient of thermal expansion to be verified. However, there are other factors that also affect it. This paper analyzes the effect of some of the uncertainty sources in the testing of the coefficient of thermal expansion of the overhead conductors. Firstly, the thermal expansion process is described and the uncertainty sources related to the conductor and the line section are identified. Then, the uncertainty sources and their effect on the CTE testing are quantified.
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Mamala, Andrzej, Tadeusz Knych, Beata Smyrak, Paweł Kwaśniewski, Grzegorz Kiesiewicz, Michał Jabłoński, and Wojciech Ściężor. "An Analytical Model for the High Temperature Low Sag Conductor Knee Point Determination." Key Engineering Materials 641 (April 2015): 173–80. http://dx.doi.org/10.4028/www.scientific.net/kem.641.173.

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The modern high voltage power overhead lines operate with high temperature low sag (HTLS) conductors due to possibility of the current capacity increase. HTLS conductors are material and technological advanced solutions. The main advantage of HTLS conductors is a special designed operation conditions which cause the transformation of tensile stresses from the external aluminium base layers to the core. The conditions of this transformation are called “knee point” because a rapid change of the conductor sag - temperature relationship is observed. Prediction of conditions of the “knee point” temperature (KPT) is a key problem during overhead line design. The KPT is a function of different factors like conductor materials properties, conductor design, span parameters, sagging procedures and overhead line exploitation conditions. The paper presents an original theoretical model for HTLS conductors KPT calculations and shows some examples and comparisons of the different conductor designs and parameters.
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Volokhovskiy, Vasily, Vasily Sukhorukov, and Victor Tzukanov. "Strength Assessment of Deteriorated OHL Conductors and Earth Wires Based on Non-Destructive Testing." Key Engineering Materials 569-570 (July 2013): 1156–63. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.1156.

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Safety operation of overhead lines depends on many factors including strength of conductors and earth wires. Therefore worn-out or defective conductors or earth wires must be detected. Estimation of conductor technical conditions is based on comparison of revealed flaws with requirements of overhead line project and build documentation. It is well known that conductors are affected by corrosion, friction and fatigue wear. All this factors may cause loss of strength and even breakage of conductor. Steel core is the most important part of conductor when it comes to mechanical loads. That is why it is very important to know actual technical conditions of steel core of conductor. Worn or defective wires must be repaired or replaced. Principles of strength assessment of deteriorated of steel-aluminum conductors and steel earth wires based on magnetic non-destructive testing technique are presented. The retention of overhead line conductor and earth wire is one of the most reasonable ways to eliminate the unacceptable clearances. The allowable magnifying tension, regarding the reliable operation, is set relying upon the non-destructive testing of conductors or earth wires in actual state. The measured loss of metallic cross-section area due to abrasion, corrosion etc. and local wire breaks are treated as input data for mechanical model of objects under test. The residual strength estimates give the specialists network company further information that helps to make a valid decision on testing time-limit and policy. Some results of assessing the strength of overhead line conductors and earth wires according to the NDT data are demonstrated.
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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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Badibanga, Remy, Thiago Miranda, Pedro Rocha, Jorge Ferreira, Cosme da Silva, and José Araújo. "The effect of mean stress on the fatigue behaviour of overhead conductor function of the H/w parameter." MATEC Web of Conferences 165 (2018): 11001. http://dx.doi.org/10.1051/matecconf/201816511001.

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The objective of this work is to evaluate the effects of mean stress on the fatigue behaviour of an All Aluminium Conductor (AAC Orchid), Aluminium Conductor Steel Reinforced (ACSR Tern), and an Aluminium Conductor Alloy Reinforced (ACAR 750 MCM). In this sense, 72 fatigue tests on overhead conductors were performed using different values of H/w parameter. Based on the experimental results, the parameters which describe the fatigue behaviour of the conductors were determined after generating theirs S-N curves. In the assessment of the mean stress effects on the fatigue life, Goodman and Gerber’s relations were fitted to evaluate the use of such models for the conductors. It was observed that the evaluation of the mean stress effect on the overhead conductor could be made by using the fatigue relations.
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Varygina, A. O., and N. V. Savina. "Calculation the current carrying capacity of the new generation overhead lines conductors." Power engineering: research, equipment, technology 22, no. 4 (November 15, 2020): 3–15. http://dx.doi.org/10.30724/1998-9903-2020-22-4-3-15.

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Currently, there is an increase in power flows along power lines. An important task for the development of the power grid complex is to increase the current-carrying capacity of existing power lines. The use of advanced conductors has become a successful technical solution for this purpose. "New generation conductors" are modern conductors that have advanced mechanical and electrical properties and characteristics. Thus, it has become important to have information about the maximum operation temperature and current limits of the overhead line with new conductors. The approximate current-carrying capacity in Amperes is the value of current at which the conductor temperature reaches its maximum permissible value. It determines the maximum current load of overhead power lines. For traditional steelaluminum conductors, there are several methodological approaches to determining the maximum current load. This fact complicates the definition of an approach to calculating the current carrying capacity for advanced conductors. Nevertheless, the general basis of all methodological approaches is the thermal balance of the conductor. The purpose of this article is to assess the possibility of adapting the method of calculating the approximate currentcarrying capacity of traditional conductors to the calculation of advanced conductors. The article deals with advanced conductors of various brands of comparable cross-section with the classic ACSR 240/39. This work provides information about the selected conductors, their characteristics and design features. The paper shows a mathematical model for calculating the approximate current-carrying capacity of a conductor and shows calculating results for selected conductors. According to the results of analysis and calculations, the adaptation of the presented mathematical model is possible if we refine its parameters and coefficients.
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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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Zheng, Wei, Xizhong Li, Zhongkai Xu, Zhuochen Jin, and Yang Liu. "Research on corrosion mechanism of overhead conductor." E3S Web of Conferences 233 (2021): 01085. http://dx.doi.org/10.1051/e3sconf/202123301085.

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During the operation of overhead conductors, conductors are corroded to varying degrees by the smoke and dust, harmful gases from factories around the lines, or in corrosive salt fog atmosphere in coastal and island areas, as well as humid and hot weather conditions. In this paper, through the study of the corrosion mechanism of the conductor, the types of the corrosion are analyzed, and the factors leading to the corrosion and the corrosion process are analyzed by selecting the steel cored aluminum stranded wire, so as to provide theoretical basis for the development of anti-corrosion wire and the judgment of corrosion detection.
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Liu, Yongdou, Zhiwei Chen, and Quan Gu. "Numerical Algorithms for Calculating Temperature, Layered Stress, and Critical Current of Overhead Conductors." Mathematical Problems in Engineering 2020 (April 30, 2020): 1–14. http://dx.doi.org/10.1155/2020/6019493.

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Accurate calculation of temperature, stress, sag, and critical current (corresponding to critical temperature) of operational overhead conductors is important for ensuring the strength and sag safety of overhead lines. Based on 2D steady-state heat transfer equations, this article studies the temperature fields of the cross section of typical electrified conductors and establishes numerical simulation methods for calculating the layered stress, sag, and critical temperature. Using the algorithm, the relationship between the critical temperature and characteristics of conductors (e.g., the sag and tensile force) is studied. The results are verified by a comparison with the test results for heat-resistant aluminum alloy conductors JNRLH1/G1A-400/65 and JNRLH1/G1A-630/55. Finally, the paper studies the relationship between the critical temperature of the conductor and its most sensitive factors.
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Zhao, Xin Ze, Zhen Xing Yang, Mei Yun Zhao, Lei Wang, and Zhi Cheng Fu. "Analysis on Corona Discharge Characteristics of the Overhead Conductor." Advanced Materials Research 1092-1093 (March 2015): 233–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.233.

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LGJ150/25 steel core aluminum stranded wires were selected as the test wires, and the aeolian vibrations which work in different cycle times of wire that is under the conditions of dry and acidic corrosion were simulated by the self-made test bed. The electronic number of corona discharge of each pre-set conductor was measured, when applying AC high voltage on the wearing wires step by step,so that the corona inception voltages of the conductors could be confirmed. And the effect of the vibration cycle times and environmental conditions on the corona discharge was researched. Taking the sum of all aluminium stands wear area of a pre-set wire as the fretting wearing capacity, the relationship between the wire wearing capacity and the corona discharge was studied. The results indicate that the corona inception voltages of the conductors decrease with the increase of the cycle times and the wires wear capacity. In general, the wear capacity of the acidic corrosion conductors is larger, and its corona inception voltage is lower. Therefore the decrease of the conductor fretting wear can effectively reduce the corona loss of transmission lines and other hazards.
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Dissertations / Theses on the topic "Overhead conductors"

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Enegela, Odagboyi. "Ageing of overhead conductors." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/ageing-of-overhead-conductors(77eb04ae-7a95-4443-bc62-ba0de2664590).html.

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Overhead conductors used in the transmission of power in grids around the world are generally subjected to ageing, which is the time-based change of their properties. Important properties such as corona discharge, audible noise, hydrophobicity and corrosion are usually considered and investigated. On some conductors such as the aluminium conductor steel reinforced (ACSR), a reduction in audible noise over exposure time to the service environment has been noted to occur. However, the converse has been observed for the gap-type thermal resistant aluminium conductor steel reinforced (GTACSR or “Matthew” conductor), although this conductor is preferred due to its high ampacity. The relationship between conductor hydrophobicity, audible noise, surface contamination and roughness, wettability and corrosion were investigated using All Aluminium Alloy Conductor (AAAC), Aluminium Conductor Composite Core (ACCC) and GTACSR samples. Findings from Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectric Spectroscopy (XPS) and contact angle measurements revealed that carbon, hydrocarbon and silicone contamination was responsible for the hydrophobic nature of the surface. Furthermore, electrochemical investigations and electron microscopy showed that pitting or/and crevice corrosion were the predominant corrosion mechanisms on these conductors. Exposure to simulated industrial and marine environments further confirmed this finding and also showed that general corrosion also occurs on relatively uncontaminated conductors, thereby changing their surface roughness, as seen from the White Light Interferometry results. Corrosion was observed to be accelerated by the presence of surface contaminants such as oils and carbon, as these facilitated water (droplet) retention by reducing the conductor’s surface energy. Reduction/elimination of surface contamination/hydrophobicity were the desired solutions to the problem, and this was achieved by grit blasting. Partial/complete oxidation of the silicones resulted in the reduction/elimination of sample hydrophobicity – this was seen from more contact angles measurements and XPS data. Grit blasting also restored conductor cleanliness and roughened the surface sufficiently to produce surface run-off.
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Li, Qi. "Acoustic noise emitted from overhead line conductors." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html.

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The developments of new types of conductors and increase of voltage level have driven the need to carry out research on evaluating overhead line acoustic noise. The surface potential gradient of a conductor is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometries. This thesis proposes a novel method which utilizes both analytical and numerical procedures to predict the surface gradient. Stranding shape, proximity of tower, protrusions and bundle arrangements are considered within this model. One of UK National Grid's transmission line configurations has been selected as an example to compare the results for different methods. The different stranding shapes are a key variable in determining dry surface fields. The dynamic behaviour of water droplets subject to AC electric fields is investigated by experiment and finite element modelling. The motion of a water droplet is considered on the surface of a metallic sphere. To understand the consequences of vibration, the FEA model is introduced to study the dynamics of a single droplet in terms of phase shift between vibration and exciting voltage. Moreover, the evolution of electric field within the whole cycle of vibration is investigated. The profile of the electric field and the characteristics of mechanical vibration are evaluated. Surprisingly the phase shift between these characteristics results in the maximum field occurring when the droplet is in a flattened profile rather than when it is ‘pointed’.Research work on audible noise emitted from overhead line conductors is reviewed, and a unique experimental set up employing a semi-anechoic chamber and corona cage is described. Acoustically, this facility isolates undesirable background noise and provides a free-field test space inside the anechoic chamber. Electrically, the corona cage simulates a 3 m section of 400 kV overhead line conductors by achieving the equivalent surface gradient. UV imaging, acoustic measurements and a partial discharge detection system are employed as instrumentation. The acoustic and electrical performance is demonstrated through a series of experiments. Results are discussed, and the mechanisms for acoustic noise are considered. A strategy for evaluating the noise emission level for overhead line conductors is developed. Comments are made on predicting acoustic noise from overhead lines. The technical achievements of this thesis are summarized in three aspects. First of all, an FEA model is developed to calculate the surface electric field for overhead line conductors and this has been demonstrated as an efficient tool for power utilities in computing surface electric field especially for dry condition. The second achievement is the droplet vibration study which describes the droplets' behaviour under rain conditions, such as the phase shift between the voltage and the vibration magnitude, the ejection phenomena and the electric field enhancement due to the shape change of droplets. The third contribution is the development of a standardized procedure in assessing noise emission level and the characteristics of noise emissions for various types of existing conductors in National Grid.
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McWhorter, Bruce Burnett. "Transient temperature distributions in short-circuited electrical conductors." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/15951.

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Wells, M. Glenn. "Transient temperature distributions in overhead fiber-optic ground wires." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16885.

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Savoullis, Yiannakis C. "Experimental verification and modification of a real-time ampacity program for overhead conductors." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/17840.

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Chen, Shelley L. "Programs for calculating high temperature ampacity and sag for overhead electrical conductors." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17933.

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Mirshafiei, Farshad. "Modelling the dynamic response of overhead line conductors subjected to shock-induced ice shedding." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97198.

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In cold climate regions, overhead transmission lines are prone to atmospheric icing which can be a source of several dynamic effects. The work presented in this study is concerned with accurate numerical modelling of the propagation or progression of ice shedding phenomena following an initial trigger such as a controlled shock load applied locally with a cable de-icing device, or uncontrolled shocks due to cable rupture or random ice dropping. An improved ice failure model for glaze ice cylindrical deposits on a stranded wire is proposed to study ice shedding effects. The model is verified with the results of forced ice shedding experiments on a reduced-scale single-span model tested by Kálmán (2007) at CIGELE Laboratory of Université du Québec at Chicoutimi (UQAC). The physical model is a 4 m span of a 4.1 mm diameter flexible stainless cable with an initial sag-to-span ratio of 6%. In the present study, the ice deposit is assumed elastic-plastic and the failure criterion is based on maximum normal strains; the numerical results are in better agreement with the experimental data as compared to the previous study by Kálmán (2007) who assumed a maximum normal stress failure criterion. The challenge is to predict not only the fracture of the ice deposits but also whether the fractured deposits will remain attached to the conductor or will fall off. In the tests, iced spans (loaded with different ice thicknesses) were subjected to a concentrated shock load applied at the mid span. Commercial software ADINA is used to simulate the nonlinear dynamic response of the iced cable to the shock load and subsequent ice-shedding transient effects.This new iced cable model and failure criterion is implemented to conduct numerical simulations of real-scale single spans subjected to shock loads, and the results are compared with previous work by Kálmán (2007).Following the improved performance of the new ice failure model, it has been applied to the case study of a Hydro-Québec 120 kV two-circuit line section that failed during an ice storm event in the spring of 1997. This line has suffered two conductor ruptures that initiated the subsequent failure of two suspension structures. A nonlinear dynamic analysis is performed which considers ice-shedding effects following the conductor ruptures. The results are compared with those of Lapointe (2003) who considered only conductor rupture effects on the fully iced line section.
En régions froides, les lignes aériennes de transport sont exposées au givrage atmosphérique qui peut devenir la source de plusieurs effets dynamiques. Cette étude porte sur la modélisation numérique de la progression des phénomènes de délestage de glace des conducteurs de ligne suivant l'application d'un choc mécanique local généré par un dispositif de dégivrage de câble, ou l'effet des chocs non contrôlés dus à la rupture de câbles ou au délestage aléatoire naturel de la glace. Un modèle amélioré pour simuler la rupture du manchon cylindrique de glace accumulé sur un câble est proposé dans cette étude et vérifié à l'aide de résultats expérimentaux obtenus par Kálmán (2007) sur un modèle réduit d'une portée unique au laboratoire CIGELE de l'Université du Québec à Chicoutimi (UQAC). Le modèle physique a une portée de 4 m et est composé d'un câble en acier inoxydable flexible de 4.1 mm de diamètre avec un rapport flèche/portée de 6%. Dans le modèle proposé, le dépôt de glace est supposé élastique-plastique et le critère de rupture est basé sur les déformations normales; les résultats des simulations numériques sont en meilleur accord avec les données expérimentales que celles de l'étude précédente de Kálmán (2007) qui utilisait un critère de rupture basé sur les contraintes normales. Le défi des simulations numériques du délestage de glace est de prévoir non seulement la fissuration des dépôts de glace mais également si leur détachement est complet du conducteur. Lors des essais, des portées de câble glacé (chargées avec différentes épaisseurs de glace) ont été soumises à un choc appliqué à mi-portée. L'étude utilise le logiciel commercial ADINA AUI 8.5 pour simuler la réponse dynamique non linéaire du câble glacé suite au choc appliqué. Le nouveau critère proposé pour la rupture du dépôt de glace est ensuite utilisé pour simuler la réponse de portées uniques à l'échelle réelle soumises à des chocs appliqués à mi-portée, et les résultats sont comparés à ceux de l'étude de Kálmán (2007).Finalement, le modèle amélioré a été appliqué à l'étude du cas d'une section de ligne biterne à 120 kV d'Hydro-Québec qui a été endommagée lors d'une tempête de verglas en 1997. Cette ligne de ligne a subi deux ruptures de conducteur qui ont causé l'effondrement de deux pylônes de suspension. Cet événement avait été déjà été modélisé par Lapointe (2003) mais sans la possibilité de tenir compte du délestage de glace suite aux chocs de rupture des conducteurs.
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Filipovic-Gledja, Visnja. "A probability based unified model for predicting electrical, mechanical and thermal characteristics of stranded overhead-line conductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30086.pdf.

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Qi, Gang. "Computational modeling for stress analysis of overhead transmission line stranded conductors under design and fretting fatigue conditions." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121122.

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While great efforts have been made in the electrical utility industry to engineer various stranded conductors with enhanced strength and vibrational characteristics, research devoted to understanding the complex mechanical behavior of complete conductors has been scarce, especially from a computational mechanics perspective. In the meanwhile, the long-lasting problem of conductor fretting fatigue becomes increasingly critical for overhead line design and maintenance, especially with the world-wide aging of electrical transmission grids. Aging of conductors contributes to significant degradation of their local fatigue strength, leading to drastic reduction of their service life. However, the complex mechanical response of stranded conductors cannot be well predicted by either experimental testing or simplified theoretical models, owing to the physical complexity introduced by their multi-layer stranded geometry, nonlinear material properties, substantial frictions among the wires and between the wires and hardware clamping systems, as well as the comprehensive contact interactions amongst their components. Simplified beam models and coarse 3-D models of earlier computational studies also fail to calculate the accurate stress variations inside a conductor strand and capture the stress gradients near the contact interfaces. Moreover, the estimations of fretting fatigue life are very dependent on the high accuracy of the stress predictions in the conductor wires. Therefore, reliable high-fidelity computational models have been long expected for a better understanding of the contact damage of transmission line conductors under both design and fretting fatigue conditions. The main objective of this thesis is to study the complex stress states and relevant influencing factors of stranded electrical conductors, using finite element analysis approaches. The research was carried out in three stages. First of all, a study focused on the finite element (FE) modeling of an optical ground wire (OPGW) cable strand for its detailed stress analysis. A refined 3-D FE model including all essential nonlinear characteristics was successfully constructed. As a result, a high-fidelity physics-based macroscopic modeling methodology was developed for detailed and accurate computational stress analysis of stranded conductors. A 795 kcmil Drake ACSR conductor was then selected as a benchmark conductor to investigate the tensile strength and critical stress states of a complete conductor under extreme design conditions. Furthermore, a sensitivity study explored the relative importance of friction effects among conductor wires on the mechanical response.A large scale 3-D FE stress analysis model with comprehensive nonlinearities was developed and implemented to simulate an actual ACSR fretting fatigue test. The computational results showed good agreement with some experimental measurements and field observations reported in the open literature. Based on the accurate stress analysis, a practical multi-axial fatigue lifing methodology was developed to estimate local fretting fatigue strength of electrical conductors. Subsequently, a parametric study was performed to examine the influence of fretting amplitudes on the mechanical response of the conductor-clamp system.In conclusion, this research shows the reliability and significance of using reliable FE modeling in predicting the complex response of stranded conductors, which has contributed to fill some of the current knowledge gaps. Furthermore, the computational modeling and lifing approaches developed in this thesis provide a different perspective from existing practices and may become a starting block of further exploration of the mechanisms of conductor fretting fatigue and future development of improved fatigue lifing methods for the increasingly aging overhead transmission line conductors.
Malgré les efforts déployés par l'industrie des lignes de transport d'électricité pour la conception de conducteurs toronnés de haute résistance mécanique, la recherche dédiée à la compréhension physique du comportement mécanique des conducteurs s'est faite plus rare, surtout du point de vue de la mécanique computationnelle. Le problème du vieillissement des conducteurs de lignes aériennes à haute tension, en particulier celui de l'usure en fatigue des brins et torons, n'est toujours pas complètement compris ni donc résolu. Le vieillissement des conducteurs se manifeste par une dégradation importante de leur résistance locale à l'usure en fatigue, réduisant par le fait même leur vie utile et la robustesse mécanique de l'ensemble de la ligne. Il faut reconnaître que les études expérimentales et les modèles théoriques simplifiés ne peuvent pas prédire le comportement mécanique détaillé des conducteurs toronnés à cause de la complexité physique de ces câbles: torons et brins multicouches, matériaux inélastiques non-linéaires, effets des frictions substantielles entre les brins, torons et les surfaces des accessoires d'attache, ainsi que les interactions de contact entre ces éléments.Les travaux rapportés dans la thèse procèdent en trois étapes principales, décrites ci-après. La première partie consiste à préparer un modèle de section de câble de garde à fibre optique (CGFO) de construction complexe et d'en faire l'analyse détaillée sous déplacement axial contrôlé. Cette étape a servi à établir les bases de la méthodologie proposée, lesquelles sont discutées de manière exhaustive. La deuxième partie de la recherche porte sur la modélisation raffinée du conducteur de ligne ACSR 795 kcmil qui porte le nom de code « Drake », sélectionné comme cas de référence pour étudier la résistance en traction et les états de contraintes complexes du conducteur sous des conditions de conception extrêmes de conception. sensibilité a également exploré l'importance relative des effets frictionnels entre les brins du câble sur les contraintes calculées par le modèle. Finalement, un modèle détaillé 3-D est créé pour simuler les conditions précises d'un essai typique de fatigue en flexion pour le conducteur « Drake » jumelé à une pince de suspension. Le modèle retient toutes les non-linéarités du problème d'un point de vue mécanique. l'auteur suggère une méthode pratique pour évaluer la résistance locale en fatigue multiaxiale des conducteurs du type ACSR au droit des points de contact des pinces de suspension. Cette méthode est relativement simple d'application (une fois les analyses de contraintes disponibles) et donne des résultats en accord avec les valeurs recommandées par les manufacturiers pour le câble « Drake ». Par la suite, une étude paramétrique est faite pour vérifier l'influence de l'amplitude des mouvements de glissement sur les états de contraintes déterminés dans le conducteur dans la région de contact avec la pince sous l'effet d'un cycle complet de chargement flexionnel. En conclusion, cette recherche démontre la faisabilité et la pertinence de l'usage des méthodes computationnelles avancées pour l'analyse des contraintes d'un problème complexe comme celui des conducteurs toronnés multicouches. La méthodologie de construction des modèles est une contribution scientifique importante qui permet d'améliorer notre compréhension du comportement mécanique des conducteurs sous charges extrêmes ou dans des conditions de fatigue flexionnelle. La méthode proposée pour l'estimation de la résistance à l'usure en fatigue est également utile pour l'industrie des lignes de transport et pour les manufacturiers de câbles et il est envisageable que cette recherche servira de tremplins à plusieurs autres études computationnelles pertinentes sur les conducteurs de lignes afin d'améliorer leur fiabilité et leur robustesse mécanique.
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Cao, Jing. "Mechanical properties and prediction of "pseudo-creep" of overhead power transmission conductors under room temperature and constant load." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22643.

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An overhead power transmission conductor must maintain a safe distance from the objects underneath it. However, this distance decreases with time, even under conditions where metallurgical creep of the cable material does not occur, for instance, at room temperature. This phenomenon is first identified as "pseudo creep".
The creep behavior of a cable is directly related to its mechanical properties, which correspond to the applied loads under certain boundary conditions. Twist due to cable rotation and radial compression due to layer-to-layer contact are taken into consideration, so that a deeper understanding of what happens inside the cable and a quantitative assessment of their influence on the effective rigidity of the cable are obtained.
The radial creep of a cable is found to be more sensitive, since it takes a longer time to saturate owing to the accumulation of the radial deformations of individual wires and the time-dependent expansion and relocations of the hardened areas.
The time-dependent behavior of a cable is evaluated by experiments. Comparisons of the configurational parameters that determine the cable behavior are made for particular load types and boundary conditions.
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Books on the topic "Overhead conductors"

1

Diana, Giorgio, ed. Modelling of Vibrations of Overhead Line Conductors. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72808-7.

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Wing, Uttar Pradesh State Electricity Board Electricity Research Institute Planning. Thermal over-loading of transmission lines. New Delhi: Research Scheme on Power, Central Board of Irrigation and Power, 1988.

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Institution, British Standards. Specification for copper and copper-cadium stranded conductors for overhead electric traction and power transmission systems. London: B.S.I., 1997.

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Morgan, Vincent T. Thermal behaviour of electrical conductors: Steady, dynamic, and fault-current ratings. Taunton, Somerset, England: Research Studies Press, 1991.

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Don, Russell B., and IEEE Power Engineering Society. Power Engineering Education Committee., eds. Detection of downed conductors on utility distribution systems. Piscataway, NJ: Available from Publication Sales Dept., IEEE Service Center, 1989.

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MacDonald, Robert W. Vortex-induced vibration of single and bundled overhead power conductors. 1988.

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Diana, Giorgio. Modelling of Vibrations of Overhead Line Conductors: Assessment of the Technology. Springer, 2018.

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Diana, Giorgio. Modelling of Vibrations of Overhead Line Conductors: Assessment of the Technology. Springer, 2019.

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Institute Of Electrical and Electronics Engineers. IEEE Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors. Institute of Electrical & Electronics Enginee, 1986.

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IEEE Power Engineering Society. Transmission and Distribution Committee., ed. IEEE standard for calculating the current-temperature relationship of bare overhead conductors. New York: Institute of Electrical and Electronics Engineers, 1993.

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Book chapters on the topic "Overhead conductors"

1

Subba Reddy, B., Praveen C. Ramamurthy, and S. Saravanan. "Deterioration of Overhead Rail Traction Conductors Due to Corrosion—A Laboratory Study." In Lecture Notes in Electrical Engineering, 511–24. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1978-6_44.

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Chen, Long, Zhigang Liu, Jing Zhang, and Zeyao Hu. "Influence of Key Parameters on High Speed Overhead Conductor Rail and Pantograph System." In Lecture Notes in Mechanical Engineering, 201–11. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_25.

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Majstrović, Matislav, Elis Sutlović, Ivan Ramljak, and Sandro Nižetić. "Comparison of Aluminum and Copper Particle Critical Diameter Produced in Overhead Line Conductor Clashing." In The Role of Exergy in Energy and the Environment, 13–25. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89845-2_2.

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Kamboj, Sangeeta, and Ratna Dahiya. "Designing and Implementation of Overhead Conductor Altitude Measurement System Using GPS for Sag Monitoring." In Intelligent Computing Techniques for Smart Energy Systems, 183–94. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0214-9_22.

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Monazzah, Amir Mahdi Hosseini, Amir M. Rahmani, Antonio Miele, and Nikil Dutt. "Exploiting Memory Resilience for Emerging Technologies: An Energy-Aware Resilience Exemplar for STT-RAM Memories." In Dependable Embedded Systems, 505–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52017-5_21.

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AbstractDue to the consistent pressing quest of larger on-chip memories and caches of multicore and manycore architectures, Spin Transfer Torque Magnetic RAM (STT-MRAM or STT-RAM) has been proposed as a promising technology to replace classical SRAMs in near-future devices. Main advantages of STT-RAMs are a considerably higher transistor density and a negligible leakage power compared with SRAM technology. However, the drawback of this technology is the high probability of errors occurring especially in write operations. Such errors are asymmetric and transition-dependent, where 0 → 1 is the most critical one, and is high subjected to the amount and current (voltage) supplied to the memory during the write operation. As a consequence, STT-RAMs present an intrinsic trade-off between energy consumption vs. reliability that needs to be properly tuned w.r.t. the currently running application and its reliability requirement. This chapter proposes FlexRel, an energy-aware reliability improvement architectural scheme for STT-RAM cache memories. FlexRel considers a memory architecture provided with Error Correction Codes (ECCs) and a custom current regulator for the various cache ways and conducts a trade-off between reliability and energy consumption. FlexRel cache controller dynamically profiles the number of 0 → 1 transitions of each individual bit write operation in a cache block and based on that selects the most-suitable cache way and current level to guarantee the necessary error rate threshold (in terms of occurred write errors) while minimizing the energy consumption. We experimentally evaluated the efficiency of FlexRel against the most efficient uniform protection scheme from reliability, energy, area, and performance perspectives. Experimental simulations performed by using gem5 has demonstrated that while FlexRel satisfies the given error rate threshold, it delivers up to 13.2% energy saving. From the area footprint perspective, FlexRel delivers up to 7.9% cache ways’ area saving. Furthermore, the performance overhead of the FlexRel algorithm which changes the traffic patterns of the cache ways during the executions is 1.7%, on average.
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"Selection of Overhead Transmission Line Conductors." In High Voltage Engineering, 380–467. CRC Press, 2018. http://dx.doi.org/10.1201/b16748-12.

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"Conductor." In Overhead Electric Power Lines: Theory and practice, 181–227. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo193e_ch6.

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"Overhead Line Conductor and Technical Specifications." In Transmission and Distribution Electrical Engineering, 630–92. Elsevier, 2007. http://dx.doi.org/10.1016/b978-075066673-2/50022-7.

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Bayliss, C. R., and B. J. Hardy. "Overhead Line Conductor and Technical Specifications." In Transmission and Distribution Electrical Engineering, 683–750. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-08-096912-1.00018-6.

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Xiao, K., P. Li, L. Mo, Z. Chen, and Q. Gu. "Radial temperature field simulation of overhead conductor." In Progress in Civil, Architectural and Hydraulic Engineering IV, 917–21. CRC Press, 2015. http://dx.doi.org/10.1201/b19383-188.

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Conference papers on the topic "Overhead conductors"

1

Murray, T. "Aerial bundled conductors." In IEE Colloquium on `A Review of Options for Overhead Rural Distribution'. IEE, 1995. http://dx.doi.org/10.1049/ic:19950297.

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Van Dyke, Pierre, Andre´ Laneville, and Dave Bouchard. "Galloping Experimental Analysis of Conductors Covered With a D-Section on a High-Voltage Overhead Test Line." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93962.

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This paper presents galloping measurements conducted on a high-voltage overhead test line equipped with three single conductors as well as a second configuration of three conductors interconnected with interphase spacers. The test line consists of three suspension spans and two dead-end spans. To induce galloping amplitudes typical of those encountered as ice is formed on the conductor, a D-section jacketing was added to the conductors in the middle span. Conductor displacement was monitored using two accelerometers on each conductor and two video cameras. Different factors potentially influencing galloping amplitude, such as the mode that is excited, conductor tension, D-section mass per unit length and the wind’s angle of attack have been looked at.
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"Galloping of overhead power lines conductors." In Engineering Mechanics 2018. Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2018. http://dx.doi.org/10.21495/91-8-257.

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Verma, Himanshu, Ashish M. Dighe, and Peter Hagedorn. "On the Solution of Transcendental Eigenvalue Problem in Transmission Line Bundled Conductors." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60901.

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Overhead electrical transmission lines are always susceptible to aeolian vibrations, caused by light to moderate winds. Spacer dampers are used in bundled transmission lines to keep the conductors at required minimum spacing and to suppress the wind induced vibrations. Mathematical models are necessary for the computation of the conductor vibrations for studying the efficiency of damping measures. The so called energy balance method gives good results for estimating the vortex excited vibrations of overhead electrical transmission lines. In its standard form it requires the knowledge of the eigenfunctions, which are routinely calculated for the single conductor lines. However, the problem becomes more involved in the case of bundled conductors with spacer dampers due to very dense spectrum of the natural frequencies. In the present paper some approaches towards solving the transcendental eigenvalue problem (EVP) for the bundled conductors with spacer dampers are discussed. It is formulated as an algebraic transcendental EVP, which however presents several numerical difficulties. Reasons for these numerical difficulties are discussed in some detail. A new approach, named as “continuous spectrum approach,” provides better engineering solution for the transmission line bundled conductors. The solution of the EVP gives the necessary input data for applying the energy balance.
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Li, Q., R. Shuttleworth, G. Zhang, I. Dupere, and S. M. Rowland. "Acoustic noise evaluation for overhead line conductors." In 2013 IEEE Electrical Insulation Conference (EIC). IEEE, 2013. http://dx.doi.org/10.1109/eic.2013.6554216.

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Vasquez, Wilson A., Dilan Jayaweera, and Jesus Jativa-Ibarra. "Advanced aging failure model for overhead conductors." In 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). IEEE, 2017. http://dx.doi.org/10.1109/isgteurope.2017.8260134.

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Panosch, W. "20 kV overhead lines with covered conductors." In 16th International Conference and Exhibition on Electricity Distribution (CIRED 2001). IEE, 2001. http://dx.doi.org/10.1049/cp:20010691.

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Podporkin, Georgij V., and Nikolay N. Tikhodeev. "Compact 35 kV overhead lines with covered conductors." In 2005 IEEE Russia Power Tech. IEEE, 2005. http://dx.doi.org/10.1109/ptc.2005.4524340.

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Rahman, S. A., and K. Kopsidas. "Thermal State Analysis on Bundled Overhead Line Conductors." In Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion (MEDPOWER 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1886.

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Voldhaug, L. "MV overhead lines using XLPE covered conductors. Scandinavian experience and NORWEB developments." In IEE Colloquium on `A Review of Options for Overhead Rural Distribution'. IEE, 1995. http://dx.doi.org/10.1049/ic:19950298.

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Reports on the topic "Overhead conductors"

1

Welder electrocuted by contact with an energized overhead crane conductor in South Carolina, July 9, 1988. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, November 1988. http://dx.doi.org/10.26616/nioshface8832.

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