Готові списки джерел за темами / Four circuits power line tower

Добірка наукової літератури з теми "Four circuits power line tower"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Four circuits power line tower"

Zhang, Xiaolei, Yanzhong Ju, and Fuwang Wang. "Statistical Analysis of Wind-Induced Dynamic Response of Power Towers and Four-Circuit Transmission Tower-Line System." Shock and Vibration 2018 (2018): 1–18. http://dx.doi.org/10.1155/2018/5064930.

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Only one wind field model loading the transmission tower or the tower-line system was investigated in the previous studies, while the influence of two different wind field models was not considered. In addition, only one sample of the wind speed random process was used in the past numerical simulations, and the multiple dynamic response statistical analysis should be carried out. In this paper, statistical analysis of the wind-induced dynamic response of single towers and the transmission tower-line system is performed with the improved accuracy. A finite element model of the transmission tower-line system (the tower consisted of both steel tubes and angel steels) is established by ANSYS software. The analysis was performed by three statistical methods. The effects of the length of the time history and of the number of samples were investigated. The frequency histograms of samples follow the Gaussian distribution. The characteristic statistical parameters of samples were random. The displacements and the axial forces of the low tower are larger than those of the high tower. Two wind field models were applied to simulate the wind speed time history. In field 1 model, Davenport wind speed spectrum and Shiotani coherence function were applied, while in field 2 model Kaimal wind speed spectrum and Davenport coherence function were used. The results indicate that wind field 1 is calmer than wind field 2. The displacements and the axial forces of the tower-line system are less than those of single towers, which indicate damping of wind-induced vibrations by the transmission line. An extended dynamic response statistical analysis should be carried out for the transmission tower-line system.

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Zekavati, Ali-Asghar, Alireza Khodaverdian, Mohammad-Ali Jafari, and Ahmad Hosseini. "Investigating performance of micropiled raft in foundation of power transmission line towers in cohesive soil: experimental and numerical study." Canadian Geotechnical Journal 55, no. 3 (March 2018): 312–28. http://dx.doi.org/10.1139/cgj-2017-0027.

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This paper captures the behavior of micropiled rafts in power transmission line tower foundations in cohesive soil, concentrating on their uplift performance whether due to the tower position along the line or under wind loading conditions. In this regard, first a number of micropiles were driven into the ground of a project site at the ParehSar power plant, Gilan, Iran. Compression and uplift loading tests were conducted according to relevant standards. On the basis of the field data, a three-dimensional finite element model was developed and subsequently calibrated and verified. The behavior of micropiled rafts subjected to uplift, which is a typical type of loading in foundations of 230 kV four-circuit lattice towers, was then studied by means of this model in terms of a wide-ranging parametric study. In the sensitivity analyses, the impacts of various parameters, such as micropile spacing-to-diameter (s/d) and length-to-diameter (l/d) ratios along with undrained shear strength of the soil, on the uplift capacity of an individual micropile within and out of the group were investigated. Furthermore, interaction factors were computed based on diverse values for undrained shear strength of the soil, s/d ratio, l/d ratio, and grout–soil adhesion. From design and analysis perspectives, the finite element method (FEM) outputs revealed that the efficiency coefficient of micropiled rafts during uplift can be considered equal to one. Moreover, it was found that not only does the behavior of micropiles affect the neighboring micropiles immediately adjacent to the loaded one, but it also influences those in further rows, the result of which would be considering their significance as well.

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Xie, Shi Jun, Jian Ming Li, Yu Han Jiang, and Yu Zhang. "Analysis on Lightning Withstand Level of Back Striking Flashover for Double-Circuit Transmission Line." Advanced Materials Research 1070-1072 (December 2014): 1050–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1050.

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The double-circuit transmission lines have already been the significant component of power system. Because of the symmetric insulation of the two circuits, the case that both circuits trip out often happens when the tower suffer lightning strike. And it harms the stability of power system and causes serious impacts to power equipments. In this paper, an electric-magnetic transient simulation model was established. Using this model, combining the analysis of physical mechanism of back striking trip-out, the influences of earth resistance, height of tower and length of insulator on the lightning withstand level of back striking (LWLBS) were clarified. The LWLBS of high tower is much low, therefore the relative high tower should be paid more attention to defense the back striking. Reducing the earth resistance and increasing the length of insulator can both upgrade the LWLBS observably. Especially, reducing the earth resistance can enhance the effect of upgrading the LWLBS by increasing the length of insulator.

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Huang, Min, Gang Wang, Hui Hui Luo, and Yuan Sheng Liang. "A Novel Protection of Transmission Lines for Two ±500kV HVDC Systems Erected on the same Tower." Advanced Materials Research 383-390 (November 2011): 3669–74. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3669.

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Up to now, there is no precedent of applying two bipole lines (TBL) on the same tower technology of long-distance HVDC transmission project in the world. Owing to mutual influence between the two HVDC circuits on the same tower, the traditional protection of transmission line is faced with technical difficulties on fault pole identification, especially high grounded fault loop impedance. A new protection scheme of transmission lines for the double ±500kV HVDC circuits on the same tower is proposed. Based on electromagnetic decoupling method for TBL on same tower is proposed by analyzed the characteristic of coupling mutual induction, a four module components is proposed to decouple the network equation and analyze the fault modal network. On this basis, a novel method of fault pole identification based on the polarity comparison of line-mode back traveling wave is proposed. It has been made that validates the advantage of this novel protection strategy to identify the fault pole by simulation of PSCAD/EMTDC on the model of the TBL ±500kV HVDC system on the same tower in Xiluodu-Guangdong China.

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Qin, Li, Long Zhou, and Yu Jiang Pan. "Analysis of Unequal Leg Transmission Tower Line System in Wind Vibration Response." Applied Mechanics and Materials 799-800 (October 2015): 1288–91. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.1288.

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The unequal leg transmission tower in mountainous areas of 5B-ZBC4 is based to establish the finite element model of three transmission tower and four wire line system. To further study the transmission tower under wind load displacement response, firstly using ANSYS analysis of the dynamic characteristics of the tower-line system. Then, taking the power spectrum of Kaimal wind speed and simulating the curve of wind speed of transmission tower line system in mountainous areas, considering the different elevation and different sizes of wind load, to analysis the wind vibration response for the tower-line coupling system. The results indicates that the tower top displacement means of 1# tower, 2# tower, 3# tower is increasing along with the elevation changes in 0 degrees wind load; The 37 m/s is the critical wind speed of 3# tower of transmission tower line system.

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Tian, Li, Rui-sheng Ma, Hong-nan Li, and Yang Wang. "Progressive Collapse of Power Transmission Tower-Line System Under Extremely Strong Earthquake Excitations." International Journal of Structural Stability and Dynamics 16, no. 07 (August 3, 2016): 1550030. http://dx.doi.org/10.1142/s0219455415500303.

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The simulation of progressive collapse of a power transmission tower-line system subjected to extremely strong earthquakes is studied in this paper. A three-dimensional finite element model is established for the coupled system that combines three towers and four span lines based on a practical project. The birth to death technique is adopted to simulate the progressive collapse of the system by using the user subroutine VUMAT in ABAQUS. The simulation of progressive collapse of the transmission tower-line system under either single-component or multi-component earthquake excitations is conducted. The collapse path, fracture position and collapse resistant capacity of the transmission tower are investigated. The result shows that the effect of multi-component seismic excitations should be taken into account in simulation of progressive collapse of the transmission tower, since the behavior of towers under multi-component excitations is different from that of single-component excitations. In addition, incremental dynamic analysis (IDA) is carried out to verify the results obtained herein. The present result should prove useful to the seismic design of power transmission towers.

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Zhang, Zhuo Qun, You Xin Lin, and Hong Nan Li. "Wind-Induced Progressive Collapsed Performance of Cup-Type Transmission Tower-Line System." Applied Mechanics and Materials 353-356 (August 2013): 2392–96. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2392.

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The Cup-type transmission tower-line system was a classic representative of high voltage electric power carrier, which was an important lifeline project. However, it frequently collapsed under different environmental loadings, especially strong wind. In this work, four tower five line finite element models simulated wind-induced progressive collapse process by birth-to-death element technique in ABAQUS/Explicit. The numerical simulation results demonstrated that this application could describe the structural collapse performance clearly and effectively and transmission tower-line system collapse path depended on the number, position and last deformation of damage elements.

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O Donovan, Michael, Noel Barry, Joe Connell, and Eoin Cowhey. "Mutual Coupling Compensation Techniques Used for Distance Protection of Parallel Lines." Energies 14, no. 7 (April 2, 2021): 1982. http://dx.doi.org/10.3390/en14071982.

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When a distance relay protects a transmission line located on a dual circuit tower, a coupling effect will occur between the two circuits. Transposition of the circuits can reduce the mutual impedances, but this does not cater to the zero-sequence mutual coupling impedance during earth faults. As a result, the impedance measured by a distance relay under phase-to-earth fault conditions in these circumstances will not represent the correct impedance to the fault point unless these effects are taken into account. On multi-circuit lines, primarily if they operate in parallel, a zero-sequence mutual coupling should be considered when calculating settings for distance protection function. A 220 kV parallel line sharing the same tower was analysed using DigSilent Power Factory in the simulations. Phase-to-earth faults in different configurations were analysed on this system, and the reach of the protection relay was then estimated for operation. The results confirm how a protection relay can overreach and underreach in a distance protection scheme due to the influence of mutual coupling.

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Tarko, Rafał, Jakub Gajdzica, Wiesław Nowak, and Waldemar Szpyra. "Comparative Analysis of High-Voltage Power Line Models for Determining Short-Circuit Currents in Towers Earthing Systems." Energies 14, no. 16 (August 4, 2021): 4729. http://dx.doi.org/10.3390/en14164729.

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The article deals with the problems of single-phase short-circuit current distribution in overhead power lines. Short-circuit disturbances cause many negative phenomena in power networks. Since experimental studies of short-circuits in real networks are practically impossible to perform, these effects can be evaluated only theoretically, based on short-circuit current calculations with the use of appropriate mathematical models. Although short-circuit modeling is considered to be one of the simplest power system calculations, the exact mathematical description of the phenomena occurring at short-circuits is complex. Simplified normative methods are often used for short-circuit current calculations; however, this does not give ground for a thorough analysis of short-circuit current distribution in power lines. The distributions are analyzed using power line models with different degrees of complexity in line with the assumptions made for a given model. The paper presents the problem of current distribution analysis in high-voltage overhead lines for single-phase faults to the tower structures. Simulation studies were conducted on the models developed for the calculation of short-circuit currents in the high-voltage power line earthing. The objective of the analysis was to assess the validity of simplification assumptions followed by practical recommendations on the applicability of the models.

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Li, Junkuo, Fan Gao, Lihuan Wang, Yaning Ren, Chuncheng Liu, Aiquan Yang, Zhao Yan, Tao Jiang, and Chengbo Li. "Collapse Mechanism of Transmission Tower Subjected to Strong Wind Load and Dynamic Response of Tower-Line System." Energies 15, no. 11 (May 26, 2022): 3925. http://dx.doi.org/10.3390/en15113925.

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Transmission towers are prone to collapse under strong wind load, resulting in significant economic losses. In order to investigate the collapse mechanism and failure modes of the transmission tower under strong wind load and whether the wind vibration factor can greatly reflect the increasing effect of the fluctuating wind, the finite element method (FEM) is utilized to analyze the ultimate bearing capacity of a typical 220 kV transmission tower. The results show that the collapse of the tower under strong wind loads is usually due to the buckling of the leg members. When the reference wind speed is equal to 27 m/s, a small part of the main leg members reaches their yield strength, while the diagonal members are still in the elastic range, and the deformation of the transmission tower is unapparent at this wind speed. When reference wind speed is equal or greater than 30 m/s, the growing variety of main legs is totally into the plastic yield stage, and the overall deformation of this tower is visible. Therefore, the transmission tower is collapsed due to the large deformation caused by the elastic-plastic buckling of leg members. Based on the aforementioned study, a finite element model involving three transmission towers and four span transmission lines is established to analyze the dynamic response of the tower-line system below fluctuating wind. Results show that the wind-induced coefficients designed by current code not only notably satisfy the stress response of tower components subjected to fluctuating wind loads in the elastic phase but also accurately assess the collapse displacement of the transmission tower. The increasing effect of displacement on the top tower under fluctuating wind, unfortunately, could not considerably reply with the investigated factor, and the load-carrying capacity of the transmission tower in the plastic phase can be overestimated by static calculation results.

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Більше джерел

Дисертації з теми "Four circuits power line tower"

Мироненко, Олексій Васильович. "Електрична мережа напругою 110 кВ та реконструкція повітряної лінії 110 кВ". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/25645.

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Магістерська дисертація складається з пояснювальної записки та графічної частини. Пояснювальна записка виконана на 157 сторінках формату А4, я ка включає в себе 79 таблиць, 49 рисунків та 24 джерела використаної літератури. Графічна частина містить 8 аркушів технічних креслень форматом А1. В дисертації розглянуто моделювання чотириколової повітряної лінії електропередавання та розподілу напруженості електричного поля навколо її проводів враховуючи їхнє розташування в просторі, визначення особливостей застосування багатоколових опор.
The master's dissertation consists of an explanatory note and a graphic part. The explanatory note is made on 157 pages of A4 format, which includes 79 tables, 49 figures and 24 sources of used literature. The graphic part contains 8 sheets of A1 technical drawings. In the dissertation the simulation of the four circuits line and the distribution of the electric field intensity around its wires is considered, taking into account their location in space, the determination of the features of the use of multi circuits line

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Тези доповідей конференцій з теми "Four circuits power line tower"

Zhang, Bingyi, Xiaohui Wang, Min Zhao, Yisong Zhao, Xiaoyan Wang, and Guihong Feng. "Analysis of Ecological Environment for 500kV Four Circuits Power Transmission Lines on Same Tower." In 2006 International Conference on Power System Technology. IEEE, 2006. http://dx.doi.org/10.1109/icpst.2006.321455.

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Kusuma, Aristo Adi, H. M. Kevin Gausultan, Putu Agus Aditya Pramana, and Buyung Sofiarto Munir. "Auto-reclose Performance Evaluation on 500kV Transmission Line with Four Circuits on One Tower." In 2018 International Conference on Smart Green Technology in Electrical and Information Systems (ICSGTEIS). IEEE, 2018. http://dx.doi.org/10.1109/icsgteis.2018.8709099.

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Das, Parama, and Arijit Baral. "Effect of Tower Footing Resistance on Back Flashover for A Double Circuit Line." In 2019 8th International Conference on Power Systems (ICPS). IEEE, 2019. http://dx.doi.org/10.1109/icps48983.2019.9067355.

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Yang Changhui, Wang Luyang, Wang Yufei, Xue Hua, Yang Xiu, Yan Tianyou, and Huang Yetong. "Computation of unbalance factors for six-circuit transmission line on the same tower." In 2011 IEEE Power Engineering and Automation Conference (PEAM). IEEE, 2011. http://dx.doi.org/10.1109/peam.2011.6134941.

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Su, Zhipeng, Pingping Wang, Zheng Yang, and Zhenyu Xu. "Method for Parameter Decoupling for Four-Circuit Transmission Lines on the Same Tower." In 2012 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2012. http://dx.doi.org/10.1109/appeec.2012.6307379.

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Li Tiangang, Long Mao, An Ranran, Tang Cui, Wang Yi, and He Maohui. "Analysis of line parameter symmetry and phase sequence arrange concerning four circuits on one tower." In 2014 China International Conference on Electricity Distribution (CICED). IEEE, 2014. http://dx.doi.org/10.1109/ciced.2014.6991797.

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Chai, Yajing, Wenjun Zhou, Li Xue, Xiaodong Liu, and Hongmei Su. "Lightning Performances for AC 500kV Transmission Lines with Quadruple-Circuit on Single Tower." In 2007 Compatibility in Power Electronics. IEEE, 2007. http://dx.doi.org/10.1109/cpe.2007.4296504.

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li, shilong, Wei Chen, Xianggen Yin, and Deshu Chen. "Integrated Transverse Differential Protection Scheme for Double Circuit Lines on the Same Tower." In 2018 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2018. http://dx.doi.org/10.1109/pesgm.2018.8586594.

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Li, B. T., and Y. L. Li. "Intelligent Control Technology of Tripping and Reclosing for Double-circuit Transmission Line on the Same Tower." In 2010 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2010. http://dx.doi.org/10.1109/appeec.2010.5448490.

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Shuang Song, Lei Gao, Jidong Shi, Qiangsheng Bu, Yubo Yuan, and Chengchen Huang. "Method for estimating unbalanced currents in untransposed double-circuit lines on the same tower." In International Conference on Renewable Power Generation (RPG 2015). Institution of Engineering and Technology, 2015. http://dx.doi.org/10.1049/cp.2015.0321.

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