Relevant bibliographies by topics / Electrical lines - Poles and tower

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Conference papers

Academic literature on the topic 'Electrical lines - Poles and tower'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Electrical lines - Poles and tower.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Electrical lines - Poles and tower"

1

Nie, Kejian, Xinming Yu, Yuanhao Chen, Yinhe Lin, Xin Ye, and Ming Xie. "Application of Three-dimensional Design Software in Transmission Lines." E3S Web of Conferences 283 (2021): 01049. http://dx.doi.org/10.1051/e3sconf/202128301049.

Full text
Abstract:
The digitization of power grid projects is a development requirement in the era of big data, as well as an inevitable requirement for the State Grid Corporation of China to build digital power grids and improve life-cycle management. Three-dimensional design establishes three-dimensional models of ground conductors, insulators, and fittings through line electrical majors, and completes line poles and towers in a three-dimensional scene; line structure majors should establish iron tower models and basic models; survey majors should conduct topography and landforms and ground objects to complete three-dimensional scene construction. It can make the circuit design results more intuitive, reduce the drawing work of repeated components, and improve the design efficiency.
APA, Harvard, Vancouver, ISO, and other styles
2

Zhang, Ruizhuo, Bisheng Yang, Wen Xiao, Fuxun Liang, Yang Liu, and Ziming Wang. "Automatic Extraction of High-Voltage Power Transmission Objects from UAV Lidar Point Clouds." Remote Sensing 11, no. 22 (November 6, 2019): 2600. http://dx.doi.org/10.3390/rs11222600.

Full text
Abstract:
Electric power transmission and maintenance is essential for the power industry. This paper proposes a method for the efficient extraction and classification of three-dimensional (3D) targets of electric power transmission facilities based on regularized grid characteristics computed from point cloud data acquired by unmanned aerial vehicles (UAVs). First, a special hashing matrix was constructed to store the point cloud after noise removal by a statistical method, which calculated the local distribution characteristics of the points within each sparse grid. Secondly, power lines were extracted by neighboring grids’ height similarity estimation and linear feature clustering. Thirdly, by analyzing features of the grid in the horizontal and vertical directions, the transmission towers in candidate tower areas were identified. The pylon center was then determined by a vertical slicing analysis. Finally, optimization was carried out, considering the topological relationship between the line segments and pylons to refine the extraction. Experimental results showed that the proposed method was able to efficiently obtain accurate coordinates of pylon and attachments in the massive point data and to produce a reliable segmentation with an overall precision of 97%. The optimized algorithm was capable of eliminating interference from isolated tall trees and communication signal poles. The 3D geo-information of high-voltage (HV) power lines, pylons, conductors thus extracted, and of further reconstructed 3D models can provide valuable foundations for UAV remote-sensing inspection and corridor safety maintenance.
APA, Harvard, Vancouver, ISO, and other styles
3

Kruger, Judy. "Community Lifeline Framework for Leveraging Stabilization in Response and Recovery to Major Hurricanes." Disaster Medicine and Public Health Preparedness 14, no. 1 (December 19, 2019): 7–9. http://dx.doi.org/10.1017/dmp.2019.119.

Full text
Abstract:
The United States (US) and Caribbean regions remain vulnerable to the impact of severe tropical storms, hurricanes, and typhoons. In 2017, a series of hurricanes posed threats to residents living in inland and coastal communities as well as on islands isolated from the US mainland. Harvey, Irma, Jose, and Maria caused catastrophic infrastructure damage, resulting in a loss of electrical power and communications due to damaged or downed utility poles, cell towers, and transmission lines. Critical services were inoperable for many months. Emergency managers are public officials who are accountable to both political leaders and the citizens. During disaster events, emergency managers must prioritize areas of effort, manage personnel, and communicate with stakeholders to address critical infrastructure interdependences. Essential lifeline services (eg, energy and communications) were inoperable for many months, which led to increased attention from policy-makers, media, and the public.
APA, Harvard, Vancouver, ISO, and other styles
4

Salceanu, Alexandru, Marius Valerian Paulet, Constantin Dan Neagu, and Dragos Florin Bordeianu. "On the coupling influence of the relative position of human trunk with respect to the overhead high-voltage power line." ACTA IMEKO 9, no. 3 (September 30, 2020): 53. http://dx.doi.org/10.21014/acta_imeko.v9i3.790.

Full text
Abstract:
<p class="Abstract">In this article, we present our study of the relevance of the relative position of the human torso with respect to the plane of the supporting pylons of various Overhead High-Voltage Power Lines from the perspective of currents induced by the generated magnetic fields. A homogenous model of the human body that considers the trunk as an elliptic cylinder has been developed in CST Studio software. Due to the necessary theoretical brevity, the results obtained by the simulation for the loop currents along the perimeters associated with the large (28 cm) and, respectively, the small (16 cm) axis of the elliptical cross-section of the trunk are presented and discussed. Simulations have been performed for five relative positions (0°, 30°, 45°, 60°, 90°) of the human trunk with respect to the plane of the transmission towers and for two types of symmetric, double three-phase networks (110 kV and 640 A, 220 kV and 960 A, respectively), with the normal supporting poles SN 110252. We present the solutions and the selected boundary conditions with the aim of using CST software in the domain of industrial frequency. The obtained results make it possible to formulate recommendations on the reduction of human exposure to magnetic fields.</p>
APA, Harvard, Vancouver, ISO, and other styles
5

Zhang, Gang, Chuan Liu, Jie Ren, Zeng Hua Zhang, and Wei Chen. "Research of Fault Monitoring and Early Warning Technology of Optical Cable." Advanced Materials Research 986-987 (July 2014): 1549–53. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1549.

Full text
Abstract:
Electric power optic cables, as infrastructure facilities of the power communication system, are commonly affiliated to primary towers and poles of power transmission lines. And their safe and stable operation is one of important factors to guarantee the reliable power supply. At present, there are many kinds of professional application systems for equipment management in the field of Power System, so the level of their automation and intelligence is relatively high. But Management and Monitoring of outdoor lines are still staying the same as traditional methods, becoming a vulnerable part in smart grid. This paper introduces a network management system of electric power optic cables based on GIS and referred to the design method of Transmission Network Management System (TNMS). Its aims and several main developing technologies are also discussed. This system will play an important role in improving maintenance management and operational reliability for the power communication network.
APA, Harvard, Vancouver, ISO, and other styles
6

Gatta, F. M., A. Geri, and S. Lauria. "Backflashover simulation of HV transmission lines with concentrated tower grounding." Electric Power Systems Research 73, no. 3 (March 2005): 373–81. http://dx.doi.org/10.1016/j.epsr.2004.08.011.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

CHEN, GUOQING, and EBY G. FRIEDMAN. "TRANSIENT RESPONSE OF A DISTRIBUTED RLC INTERCONNECT BASED ON DIRECT POLE EXTRACTION." Journal of Circuits, Systems and Computers 18, no. 07 (November 2009): 1263–85. http://dx.doi.org/10.1142/s0218126609005654.

Full text
Abstract:
With higher operating frequencies, transmission lines are required to model global on-chip interconnects. In this paper, an accurate and efficient solution for the transient response at the far end of a transmission line based on a direct pole extraction of the system is proposed. Closed form expressions of the poles are developed for two special interconnect systems: an RC interconnect and an RLC interconnect with zero driver resistance. By performing a system conversion, the poles of an interconnect system with general circuit parameters are solved. The Newton–Raphson method is used to further improve the accuracy of the poles. Based on these poles, closed form expressions for the step and ramp response are determined. Higher accuracy can be obtained with additional pairs of poles. The computational complexity of the model is proportional to the number of pole pairs. With two pairs of poles, the average error of the 50% delay is 1% as compared with Spectre simulations. With ten pairs of poles, the average error of the 10%-to-90% rise time and the overshoots is 2% and 1.9%, respectively. Frequency dependent effects are also successfully included in the proposed method and excellent match is observed between the proposed model and Spectre simulations.
APA, Harvard, Vancouver, ISO, and other styles
8

Sekine, Toshikazu, Takashi Nakamura, and Senji Yokokawa. "Design of a wide bandpass filter with attenuation poles using lines and capacitances." Electronics and Communications in Japan (Part III: Fundamental Electronic Science) 78, no. 6 (June 1995): 41–49. http://dx.doi.org/10.1002/ecjc.4430780605.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Abuelma'atti, Muhammad Taher. "Time Domain Response of Uniform RC Lines with RC Termination at Both Ends." Active and Passive Electronic Components 19, no. 4 (1997): 199–203. http://dx.doi.org/10.1155/1997/84383.

Full text
Abstract:
The time domain response of uniform RC lines with RC termination at both ends is obtained from the approximate poles of the transfer function. A simple model is developed for the URC line. The model consists of three passive elements only and can be easily implemented for computer-aided analysis of URC lines with RC termination at both ends.
APA, Harvard, Vancouver, ISO, and other styles
10

Abuelma'atti, Muhammad Taher. "Time Domain Response of Uniform RC Lines With Resistive Termination at Both Ends." Active and Passive Electronic Components 16, no. 3-4 (1994): 135–40. http://dx.doi.org/10.1155/1994/63861.

Full text
Abstract:
The time domain response of uniform RC lines with resistive termination at both ends is obtained by obtaining the approximate poles of the transfer function. A simple model is developed for the URC line. The model consists of three passive elements only and can be easily implemented for computeraided analysis of URC lines with resistive termination at both ends.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Electrical lines - Poles and tower"

1

Pinto, André Jinno Gomes 1983. "Modelagem de torres de transmissão utilizando análise numérica dos campos eletromagnéticos e funções racionais." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260916.

Full text
Abstract:
Orientadores: José Pissolato Filho, Eduardo Coelho Marques da Costa
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-24T10:02:40Z (GMT). No. of bitstreams: 1 Pinto_AndreJinnoGomes_D.pdf: 9708757 bytes, checksum: 84772389fed6b8c0c68adcdd4db7cd9b (MD5) Previous issue date: 2014
Resumo: A análise do comportamento dinâmico da torre de transmissão de energia elétrica e torres de telecomunicações é de interesse nos estudos de proteção relacionados com descargas atmosféricas. Normalmente, a impedância de surto da torre no domínio do tempo é usada para caracterizar o comportamento dinâmico da torre. A principal desvantagem na definição de tais impedâncias de surto é a dependência da forma de onda de excitação, e não há consenso sobre a forma de onda de corrente a ser usada. Além disso, não há concordância sobre uma definição única da tensão envolvida. A fim de contornar tais limitações e problemas, o modelo aplicado ao estudo faz uso das análises no dominio da frequência, onde a impedância de surto da torre depende somente da geometria da estrutura e das características eletromagnéticas do meio. Ademais, as limitações associadas com as abordagens simplificadas são enfatizadas no decorrer do presente trabalho. Os resultados apresentados fazem uso de ferramentas computacionais como o código NEC-2 (Numerical Electromagnetic Code) que se baseia na análise numérica da dinâmica do campo eletromagnético. Com a utilização desse código, correntes são geradas e posteriormente utilizadas para o cálculo da impedância de surto da torre. Posteriormente, é gerado um circuito RLC representativo das características da estrutura metálica, obtidas pelo método de vector fitting que aproxima a função impedância de surto da torre por funções racionais. Por fim, o circuito RLC gerado pode ser aplicado nas análises diretamente no domínio do tempo com o uso de programas computacionais como o EMTP (Electromagnetic Transients Program), sem a necessidade do uso de transformadas para alterar o domínio de análise
Abstract: The dynamic analysis of the behavior in power transmission towers and telecommunications towers is of interest in studies related to lightning protection. Normally, the surge impedance of the tower in the time domain is used to characterize the dynamic behavior of the tower. The main disadvantage of these definition of surge impedances is the dependence on the waveform of excitation, and there is no consensus on which current wave to be used. Furthermore, there is no agreement on a single definition of the voltage involved. In order to overcome such limitations and problems, the model applied to the study makes use of the analysis in the frequency domain, where tower¿s surge impedance depends only on the geometry of the structure and electromagnetic characteristics of the medium. Moreover, the limitations associated with the simplified approaches are emphasized in the course of this work. The results presented make the use of computer code as NEC-2 (Numerical Electromagnetic Code) based on the numerical analysis of the electromagnetic field dynamics. Using this code, currents are generated and then used to calculate the surge impedance of the tower. Subsequently, an RLC circuit is generated representating the characteristics of the metal structure, obtained by vector fitting method, that approximates the surge impedance function of the tower by means of rational functions. Finally, the generated RLC circuit can be applied directly in analyzes in the time domain using computer programs such as EMTP (Electromagnetic Transients Program) without the need of using transforms to change domain analysis
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
APA, Harvard, Vancouver, ISO, and other styles
2

Pinto, André Jinno Gomes 1983. "Análise dos parâmetros elétricos e transitórios eletromagnéticos de linhas de transmissão compostas por torres com altura elevada." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259379.

Full text
Abstract:
Orientador: José Pissolato Filho
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-18T03:00:37Z (GMT). No. of bitstreams: 1 Pinto_AndreJinnoGomes_M.pdf: 60896723 bytes, checksum: 8ce23cc18a981b5042b135acfc03ec42 (MD5) Previous issue date: 2011
Resumo: As redes de transmissão de energia elétrica estão entre as grandes contribuições que a engenharia ofereceu à civilização moderna. Se tornando aparentes, pelas expressivas linhas de transmissão de alta tensão apoiadas sobre elevadas torres de aço que cruzam o território nacional em todas as direções. No corrente trabalho tem-se por objetivo tratar das alternativas não-convencionais de transmissão de energia elétrica. Comparando o desempenho dessas novas estruturas com o comportamento das estruturas atualmente utilizadas no sistema de transmissão convencional. Para tal são descritos alguns dados da atual configuração do sistema de transmissão nacional. Ademais, breves descrições técnicas serão apresentadas sobre os principais componentes de linhas de transmissão convencionais, tais como: condutores múltiplos, isoladores e anéis anticorona. Tais definições serão introduzidas com o âmbito de proporcionar uma maior familiaridade com o tema em estudo. Uma análise minuciosa é traçada no cálculo dos parâmetros elétricos na frequência, seguido de um estudo dos transitórios eletromagnéticos no domínio do tempo. Causados por sinais de tensão aplicados a entrada das linhas de transmissão
Abstract: The transmission of electric energy is among the great contributions that engineering offered to modern civilization. Becoming apparent, by the expressive lines of high voltage transmission supported on large steel towers that crisscross the country in all directions. In the current work has been aimed at dealing with alternative non-conventional electric power transmission. Comparing the performance of these new structures with the behavior of the structures currently used in conventional transmission system. For such thing are described some of the current configuration of the national transmission system. In addition, brief technical descriptions are presented on the main components of conventional transmission lines, such as multiple conductors, insulators and anti-corona rings. Such definitions will be introduced to the scope of providing a greater familiarity with the subject under study. A detailed analysis is plotted on the calculation of electrical parameters on frequency, followed by a study of electromagnetic transient time domain. Caused by voltage signals applied to the input of the transmission lines
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
APA, Harvard, Vancouver, ISO, and other styles
3

Gueye, Babacar Salif. "Suitability of Casuarina equisetifolia as utility poles in Senegal." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063410/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Li, Xiaoyong. "Added CFO voltages from fiberglass poles and its electrical degradation." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-11092001-113706.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Mullen, W. G. "An evaluation of the utility of four in-situ test methods for transmission line foundation design." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/38760.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bathon, Leander Anton. "Probabilistic Determination of Failure Load Capacity Variations for Lattice Type Structures Based on Yield Strength Variations including Nonlinear Post-Buckling Member Performance." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/1225.

Full text
Abstract:
With the attempt to achieve the optimum in analysis and design, the technological global knowledge base grows more and more. Engineers all over the world continuously modify and innovate existing analysis methods and design procedures to perform the same task more efficiently and with better results. In the field of complex structural analysis many researchers pursue this challenging task. The complexity of a lattice type structure is caused by numerous parameters: the nonlinear member performance of the material, the statistical variation of member load capacities, the highly indeterminate structural composition, etc. In order to achieve a simulation approach which represents the real world problem more accurately, it is necessary to develop technologies which include these parameters in the analysis. One of the new technologies is the first order nonlinear analysis of lattice type structures including the after failure response of individual members. Such an analysis is able to predict the failure behavior of a structural system under ultimate loads more accurately than the traditionally used linear elastic analysis or a classical first order nonlinear analysis. It is an analysis procedure which can more accurately evaluate the limit-state of a structural system. The Probability Based Analysis (PBA) is a new technology. It provides the user with a tool to analyze structural systems based on statistical variations in member capacities. Current analysis techniques have shown that structural failure is sensitive to member capacity. The combination of probability based analysis and the limit-state analysis will give the engineer the capability to establish a failure load distribution based on the limit-state capacity of the structure. This failure load distribution which gives statistical properties such as mean and variance improves the engineering judgment. The mean shows the expected value or the mathematical expectation of the failure load. The variance is a tool to measure the variability of the failure load distribution. Based on a certain load case, a small variance will indicate that a few members cause the tower failure over and over again; the design is unbalanced. A large variance will indicate that many different members caused the tower failure. The failure load distribution helps in comparing and evaluating actual test results versus analytical results by locating an actual test among the possible failure loads of a tower series. Additionally, the failure load distribution allows the engineer to calculate exclusion limits which are a measure of the probability of success, or conversely the probability of failure for a given load condition. The exclusion limit allows engineers to redefine their judgement on safety and usability of transmission towers. Existing transmission towers can be reanalyzed using this PBA and upgraded based on a given exclusion limit for a chosen tower capacity increase according to the elastic analysis from which the tower was designed. New transmission towers can be analyzed based on the actual yield strength data and their nonlinear member performances. Based on this innovative analysis the engineer is able to improve tower design by using a tool which represents the real world behavior of steel transmission towers more accurately. Consequently it will improve structural safety and reduce cost.
APA, Harvard, Vancouver, ISO, and other styles
7

Groch, Matthew. "HV Transmission line and tower inspection safe-fly zone modelling and metrology." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85795.

Full text
Abstract:
Thesis (MEng)-- Stellenbosch University, 2013.
ENGLISH ABSTRACT: The deployment of Unmanned Aerial Vehicles (UAV) for power line inspection requires the definition of safe-fly zones. Transient Over-Voltages (TOVs) on the Overhead Transmission Lines (OHTLs) put the UAV at risk if it encroaches on these zones. In order to determine the safe-fly zones of a UAV in the vicinity of OHTLs, realistic full-scale experimental tests are done. Non-linearity in breakdown effects renders small-scale testing and computational work inaccurate. Experimental work is used to describe the close-up approach distances for worst-case scenarios. Testing cannot provide a full solution due to the limitation of the equipment available. Further tests must therefore be done at a specialised facility. Experiments are run in two phases, namely non-linear and linear tests in the High Voltage (HV) laboratory. The non-linear tests are done to derive Minimum Approach Distances (MAD). The linear experiments are used to calibrate FEKO, the simulation tool, to the measurement environment. Once correlation between the linear test data and the simulated data is found, confidence is derived in both the simulation model and the test setup. The simulations can then be used to determine a geometric factor as an input into F. Rizk’s prediction equations. The Rizk equations are used to describe the safe-fly zones alongside OHTLs as an addition to the non-linear experimental work. Along with the standard’s suggestions, the Rizk predictions are formulated in such a way that line-specific solutions can be determined. The suggested clearance values are provided in terms of per unit values, which can be selected in accordance with historical line data. Power line sparking is investigated to better understand the line radiation phenomenon. This understanding could assist in the line inspection process, as well as in the layout of power lines near radio quiet areas. Knowledge of OHTL radiation patterns can aid in the location of corona and sparking sources in the inspection process. Aerial sparking measurements are taken using a UAV carrying a spectrum analyser. Measured sparking levels are used to verify a Computational Electromagnetic (CEM) model. The CEM model can then be used to further investigate OHTL radiation characteristics.
AFRIKAANSE OPSOMMING: Die aanwending van Onbemande Vliegtuie (UAVs) vir kraglyn inspeksies, vereis die definiëring van veilige vlieg sones. Oorspannings (TOVs) op oorhoofse kraglyne (OHTLs) kan hierdie vliegtuie in gevaar stel as hulle die grense van hierdie sones oorskry. Om die veilige vlieg sones van 'n UAV in die omgewing van OHTLs te bepaal, is realistiese volskaalse toetse gedoen. Die nie-lineariteit in afbreek effekte lewer onakkurate kleinskaal toetse en rekenaar werk. Eksperimentele werk word gebruik om die benaderde afstande vir die ergste geval te beskryf. Hierdie werk kan nie 'n volledige oplossing gee nie as gevolg van ‘n beperking op huidige toerusting. Dit beteken dat verdere toetse, by ‘n meer gespesialiseerde fasiliteit, gedoen moet word. Eksperimente is uitgevoer in twee fases: nie-lineêre en lineêre toetse in die Hoogspannings (HV) laboratorium. Die nie-lineêre toetse word gedoen om die kleinste-benaderde-afstand (MAD) af te lei en die lineêre eksperimente word gebruik om FEKO (‘n numeriese elektromagnetika simulasie program) met die metings omgewing te kalibreer. Sodra daar ‘n korrelasie tussen die lineêre data en die gesimuleerde data is, kan daar aangeneem word dat die simulasie model en die toets-opstelling betroubaar is. Die simulasies kan dan gebruik word om 'n meetkundige faktor te bepaal as 'n bydrae tot F. Rizk se voorspellings vergelykings. Die Rizk vergelykings word gebruik om die veilige vlieg sones langs die OHTLs te beskryf. Dit kan dus gebruik word as ‘n toevoeging tot die nie-lineêre eksperimentele werk. Saam met die normale meet standaard voorstellings, is die Rizk voorspellings geformuleer sodat dit die lyn spesifieke oplossings kan bepaal. Die voorgestelde verklarings waardes word in per eenheid waardes beskryf, wat dan gekies kan word met ooreenstemmende historiese lyn data. Kraglyn-vonke word ondersoek om die lyn-bestraling verskynsel beter te verstaan. Hierdie begrip kan in die lyn inspeksie proses en in die uitleg van kraglyne naby radiostilte-areas help. Kennis van OHTL bestralings patrone kan help met die identifisering van corona en vonk-bronne tydens die inspeksie proses. 'n UAV met 'n aangehegte spektrum analiseerder is gebruik om die lug-vonkende metings te neem. Vonk vlakke wat gemeet is word dan gebruik om 'n Numeriese Elektromagnetiese (CEM) model te bevestig. Die CEM model kan dan gebruik word om OHTL bestralings eienskappe verder te ondersoek.
APA, Harvard, Vancouver, ISO, and other styles
8

Balagopal, R. "Experimental and Analytical Studies on Damage Detection and Failure Analysis of Transmission Towers and Tower like Structures." Thesis, 2016. http://hdl.handle.net/2005/2869.

Full text
Abstract:
The transmission line (TL) tower is an important component in electrical network system. These towers consist of members (angle sections) and connections (bolted connections) plus foundation, which act together to resist externally applied loads. The latticed towers are used to support conductors in transmission network for transmission and distribution of electricity. These towers are constructed in large numbers all over the world. The connections in electric TL classical latticed towers are peculiar compared to other types of bolted connections in buildings and bridges because (i) the angle members are connected directly or through gusset plates with bolts, (ii) the eccentric application of load due to the non-coincidence of centroid axes of angle members near the connection and (iii) members are designed as beam column element to sustain tensile or compressive forces. Bearing type bolts are used in TL towers in preference to friction type bolts, because they (i) connect thin walled angle members, (ii) are easy to use for erection at all heights, (iii) can be galvanized, (iv)erosion of galvanizing can be remedied and (v) do not require skilled personnel for installation. However, these connections are subjected to reversal of stresses due to wind load. Damage in the bolted connections generally occur due to loosening of bolts due to stress reversals (Feenstra et al. (2005) [23). The damage induced after extreme wind and earthquake may lead to collapse of the whole tower. The failure of a TL tower results in power shut down, which has huge impact on national economy. Hence, the structural safety and reliable performance of these towers are extremely important. The design of TL tower is based on minimum weight philosophy. The TL towers are highly repetitive and therefore, their designs need to be commercially competitive. The TL tower design has the following deficiencies such as misappropriate design assumptions, deficit detailing, defects in material, errors in fabrication, force fitting of members during erection, variation in grade of bolts, improper gusset plate detailing, notch cutting of member, vocalization of bolt holes, etc. Hence, to check the design and detailing aspects of members along with bolted connections and to study the behavior of tower under complex loading conditions, the prototype testing of tower is made mandatory requirement in many countries throughout the world. The structural behavior of TL tower is determined from its deflection response. Thus, the full scale testing of the towers is the only way that one can counteract the un conservatism due to structural analysis. The premature failure of TL towers occurs during prototype testing due to deficiencies in joint detailing, uncertainties in framing eccentricity, force fitting of members, unequal force distribution in bolts and gusset plate connections, etc. To have better structural response of TL tower to be tested, there is need to develop reliable model for bolted connections in TL towers. The bolted connection model plays an important role in determining the deflection response and predicting the premature member buckling failure of TL towers. The issues related to prototype testing of full scale TL towers such as fabrication errors, force fitting and notch cutting of members, application of loads, joint and crossarm detailing are discussed. The need to develop bolt slip model to simulate the actual behaviour of bolted connection in TL towers is also discussed. The bolted connections in TL towers play an important role in determining its structural behavior. The angle members used in TL towers are subjected to bi-axial bending in addition to axial load. The slip will occur in the bolted connections, due to the provision 1.5 mm bolt hole clearance. In the conventional Finite Element Analysis (FEA), the bolted connections are modeled as pin joint assuming the axial load transfer. The deflection predicted from pin joint analysis in TL towers generally does not match with experimental results. The analytical and experimental deflection value varies in the range of 30 to 50%. Hence, there is need to develop model to account bolt slip for accurate deflection and dynamic characteristic prediction of TL towers. Experimental and analytical investigations have been carried out to develop and validate bolt slip model for bolted connections in TL towers. All six degrees of freedom (both translational and rotational) have been considered to simulate the exact behaviour of bolted connections in TL towers. The model is developed based on experimental results of Ungkurapinan’s bolt slip model for axial stiffness. The rotational stiffness is formulated based on the component level experiment conducted on lap joint made of steel angle with single and double bolt subjected to tensile loading. The axial and rotational stiffness for different stages of bolt tightening is also formulated based on component level experimental investigation on lap joint. The proposed model is validated by comparing with experimental results at sub-structural level on full scale king post truss subjected to tensile loading. Further the bolt slip model is validated for different bolt tightening and failure prediction of TL tower sub panel subjected to tensile loading. Finally the proposed model is also validated for full scale TL tower for deflection prediction. NE NASTRAN, a nonlinear finite element analysis (FEA) software is used for analytical simulation and the load-deflection predictions, which are compared with the corresponding experimental results. The experimental and analytical results are in good agreement with each other. The steel pole structures are replacing the conventional lattice towers, because they have smaller plan dimension and occupy less space, when compared to lattice towers. The steel pole structures are dynamically sensitive structures and the determination of their natural frequency is extremely important. For the calculation of wind load through gust factor method, the preliminary estimation of natural frequency is required. Hence, the primary step involved in dynamic analysis is the evaluation of its natural frequency. Hence, a simplified model is proposed based on model order reduction technique for the evaluation of natural frequency of TL towers and steel pole structures. For the development of base line model to detect damage in TL towers, the natural frequency has to be updated. A semi empirical approach is proposed based on the deflection by using the proposed bolt slip model. The proposed approach of updating natural frequency is validated for different cases of member damage in TL tower sub panel, such as removal of tension, compression and hip bracing members. The transmission pole structures accumulate damage during their service life. Damage in these structures will cause a change in stiffness of the system and the physical properties of these structures, such as modal frequencies and mode shapes. Hence in the present study, the damage localization study based on modified modal strain energy approach is carried out for steel pole structures and the location of damage is identified correctly. To prevent premature failure of towers during its service life testing and failure analysis of TL towers is a mandatory requirement. In the present study, forensic failure investigation of a full scale TL tower due to deficient design of a redundant member is emphasized and the remedial measures are explained in detail. The stub failure of TL tower due to reduction in cross sectional area due to unfilled bolt hole is also discussed. To investigate the effect of unfilled bolt holes on the compression capacity of leg member, detailed FEA is carried out and compared with experimental results. The reason for failure of 9 m roof top communication tower due to redundant member deficiency is also discussed. The importance of guyed tower accessories in the guy rope design of 7 m roof top guyed pole structure is also investigated. Finally, failure investigation of compression bracing member, which has failed during testing of TL tower sub panel has been investigated. The failure load is predicted by using the proposed bolt slip model in the analysis. Thus the overall research contributions emerging from this thesis are, i) development of bolt slip model accounting for rotational stiffness, ii) development of direct method of damage detection for steel pole structures based on modified modal strain energy approach, iii) development of simplified model for prediction of natural frequency of TL tower and steel pole structures, iv) development of model updating technique through natural frequency based on semi-empirical approach and v) prediction of failure load for TL tower panel using the proposed bolt slip model.
APA, Harvard, Vancouver, ISO, and other styles
9

Persadh, Ajith Koowarlall. "A study of pole top fires on 22kV wood pole power lines in KwaZulu-Natal." Thesis, 2007. http://hdl.handle.net/10413/2240.

Full text
Abstract:
The majority of Eskom's 22kV lines use wood as the support structure material. The economics of wood pole cross arms and their flashover withstand capabilities outweigh those of steel cross arms. However, wood pole structures are vulnerable to what is known as a Pole Top Fire. When insulators and wood cross arms become polluted, small and sustained leakage currents flow along the surface of the insulator and thereafter into the wood itself. This eventually leads to burning of the wood. Many of the 22kV lines traverse vast rural lands, going over people's path ways. If this fire is not discovered timeously, it can cause breakage of the relevant cross arm or the pole itself. A broken cross arm usually causes the outer phase conductor to hang between one and two meters above ground. When it's dark, rural inhabitants cannot see clearly and walk directly into these low lying energized conductors which cause severe injuries and often fatalities. Low hanging conductors cannot be detected electrically and are potentially hazardous to humans and animals. Safety is currently one of the highest priorities for Eskom Distribution and hence there is a dire need to mitigate Pole Top Fires. The researcher hypothesizes that the implemented mitigating technique of bonding does not eliminate Pole Top Fires. In this study accurate statistics on Pole Top Fires in KwaZulu - Natal are provided and causes of fires investigated to provide an understanding thereof. Two basic mechanisms of burning have been identified and explained. These are surface tracking and sparking, and internal sparking. This has helped to explain what mitigation techniques will be effective. A critical analysis on the performance of recommended mitigation techniques is conducted. This study therefore aims to conclude on the effectiveness of implemented techniques to mitigate Pole Top Fires. By comprehensive and critical analysis of a complex operational and safety related problem technical options for mitigating or eliminating the fires are identified, critically analyzed and only those options that are really technically feasible are proposed. This has not been properly done in Eskom before. It is within this context that this research has been undertaken.
Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2007.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Electrical lines - Poles and tower"

1

E, Nickerson Robert, and American Society of Civil Engineers. Committee on Electrical Transmission Structures., eds. Electrical transmission line and substation structures: Structural reliability in a changing world : proceedings of the 2006 Electrical Transmission Conference, October 15-19, 2006, Birmingham, Alabama. Reston, Va: American Society of Civil Engineers, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wolfe, Ronald W. Designated fiber stress for wood poles. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wolfe, Ronald W. Designated fiber stress for wood poles. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Kosolapov, I. I. Izgotovlenie stoek zhelezobetonnykh opor VL ėlektroperedachi. Leningrad: Ėnergoatomizdat, Leningradskoe otd-nie, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wareing, B. Wood pole overhead lines. London: Institution of Electrical Engineers, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Martini, Leszek Zenon. Wpływ mimoosiowości w połączeniach kratowych konstrukcji wsporczych dla linii elektroenergetycznych. Kraków: Politechnika Krakowska im. Tadeusza Kościuszki, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wolfe, Ronald W. Derivation of nominal strength for wood utility poles. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Morrell, Jeffrey J. Philippine wood pole maintenance manual: A guide to the specification, inspection, and maintenance of wood poles. Laguna, Philippines: Forest Products and Development Institute, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Mayne, P. W. Experimental study of undrained lateral and moment behavior of drilled shafts during static and cyclic loading. Palo Alto, Calif: EPRI, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Agaiby, S. W. Experimental study of drained lateral and moment behavior of drilled shafts during static and cyclic loading. Palo Alto, Calif: EPRI, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Conference papers on the topic "Electrical lines - Poles and tower"

1

White, N. "EIT for the condition monitoring of wood poles carrying overhead power lines." In IEE Colloquium on Advances in Electrical Tomography. IEE, 1996. http://dx.doi.org/10.1049/ic:19960841.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Feiyang, Dai, Zhou Zexin, Wang Xingguo, and Qi Xuanwei. "An Optimization Method of Distance Protection for Parallel Lines on the same Tower." In 2020 7th International Forum on Electrical Engineering and Automation (IFEEA). IEEE, 2020. http://dx.doi.org/10.1109/ifeea51475.2020.00194.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Gao, Zhenyu, Jisheng Huang, Yutang Ma, Xintong Liu, and Haoyan Ren. "Study on the Distribution Optimization Scheme of the Grounding Device of the Transmission Line Pole Tower Next to the Fish Pond." In 2020 5th Asia Conference on Power and Electrical Engineering (ACPEE). IEEE, 2020. http://dx.doi.org/10.1109/acpee48638.2020.9136318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Qingyu Wang, Zongren Peng, Xi Yang, Naiyi Li, Jialong Wang, and Jintao Liao. "Electric field computation and optimization of composite tower in 330 kV double circuit transmission lines." In 2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2014). IEEE, 2014. http://dx.doi.org/10.1109/ceidp.2014.6995760.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Sun, Yujiao, Liang Cheng, Junhui Huang, Qun Zhang, Yichao Huang, and Yuanming Huang. "Comparison of the Influence of Different Types of Faults on Four-Circuit Transmission Lines on the Same Tower." In 2018 IEEE 2nd International Electrical and Energy Conference (CIEEC). IEEE, 2018. http://dx.doi.org/10.1109/cieec.2018.8745923.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Yu, Zhongan, Xinyu Liang, and Wensu Ding. "Unified traveling wave ranging scheme for asymmetrical parameter double-circuit and four-circuit lines on the same tower." In 2021 IEEE 4th International Electrical and Energy Conference (CIEEC). IEEE, 2021. http://dx.doi.org/10.1109/cieec50170.2021.9510205.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Guo, Chenjun, Lishuai Liu, Hong Yu, Yi Ma, Hongwei Mei, and Liming Wang. "Electric Field Distribution Calculation and Analysis of Composite Insulators Operating on Double Circuit Transposition Tower in 500kV Transmission Lines." In 2019 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE). IEEE, 2019. http://dx.doi.org/10.1109/icempe.2019.8727278.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wu, Yezhi, Xi Yang, Li Yang, and Lijuan Zhu. "Calculation of Electric Field and Configuration of Grading Ring for Composite Tower of 500 kV AC Double Circuit Transmission Lines." In 2021 International Conference on Electrical Materials and Power Equipment (ICEMPE). IEEE, 2021. http://dx.doi.org/10.1109/icempe51623.2021.9509183.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ribeiro, Marcos F. O., Joao A. Vasconcelos, and Douglas A. Teixeira. "Optimization of compact overhead lines of 138/230kV: Optimal selection and arrangement of cables and definition of the best transmission line tower topology." In 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). IEEE, 2017. http://dx.doi.org/10.1109/eeeic.2017.7977842.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pajouh, Mojdeh A., John D. Reid, Robert W. Bielenberg, Jennifer D. Schmidt, and Ronald K. Faller. "Pole Placement Near the Midwest Guardrail System." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71588.

Full text
Abstract:
Poles are regularly placed along highways and are used to support signs, lights and electrical lines. The Midwest Guardrail System (MGS) is a standard W-beam guardrail system used throughout the United States to redirect vehicles that leave the roadway away from dangerous roadside obstacles, like ravines, water hazards, and bridge piers. Placing poles near a guardrail may affect its ability to safely contain and redirect vehicles. The compatibility of poles placed in the proximity of the MGS is studied using nonlinear finite element analysis. Computer simulations were conducted with vehicles impacting the MGS with varying lateral pole offsets between the back of the system and the front face of the pole, and varying longitudinal pole location from being placed directly behind a post to directly behind the unsupported rail half-way between posts. Results show that poles placed within 16 inches behind the MGS may cause concern in regard to acceptable crash test performance for guardrail systems. Additional simulations and full-scale crash testing is required before guidelines can be recommended.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Electrical lines - Poles and tower' for particular source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography