Analysis of Transmission Tower (original) (raw)
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IJERT-Static and Dynamic Analysis of Transmission Line Towers under Seismic Loads
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/static-and-dynamic-analysis-of-transmission-line-towers-under-seismic-loads https://www.ijert.org/research/static-and-dynamic-analysis-of-transmission-line-towers-under-seismic-loads-IJERTV4IS080118.pdf Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all forces of nature like a strong wind, earthquake and snow load. Therefore, transmission line towers should be designed considering both structural and electrical requirements for a safe and economical design. This report introduces different types of transmission tower and its configuration as per Indian Standard IS-802. A typical type of transmission line tower carrying 220kV single circuit conductors is modelled and analyzed using SAP2000 considering forces like wind load, dead load of the structure, breaking load of the conductors and earthquake load as per Indian Standard IS1893: 2000 (part 1). Here we have considered optimally designed tower, which has the height of 30m which includes the ground clearance (h1), maximum sag of the lower most conductors wire (h2), vertical spacing between the conductor wires (h3) and vertical distance of earth wire from the uppermost conductor wire (h4). The earth wire or ground wire is always located at the top of the transmission tower. It has a square base width of 4.46m. The type of transmission tower considered here is square based tower having no deviation located on a plain landscape with minimal obstacles. It is located at the wind zone 1 with the basic wind speed of 33m/s. The wind pressure on the tower depends on the gust response factor (GT) which increases with height. Comparison is made between the transmission towers of different type of bracings and situated at different seismic zones such as Zone II. And the tower is analyzed both statically and dynamically. The members are designed for maximum Tension and Compression load for the most critical load combination as per code IS802. The Seismic behaviour of the tower for zone 2 has been tabulated and the deflections, axial forces, modal time period and base shear of both types of towers are noted and compared to know which of these is safe.
Static and Dynamic Analysis of Transmission Line Towers under Seismic Loads
Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all forces of nature like a strong wind, earthquake and snow load. Therefore, transmission line towers should be designed considering both structural and electrical requirements for a safe and economical design.
SEISMIC RESPONSE OF TRANSMISSION TOWER -A CASE STUDY
Towers and tower like structures are the major infrastructure for the transmission of electrical power, telecommunication and broadcasting. The transmission towers are highly repetitive and therefore the analysis and designs should be highly competitive towards commercial solutions. In the present study, an attempt has been made to analyse the existing Electrical Transmission tower of voltage 220kV using FEM software NISA. The analysis of an existing structure without secondary bracings has been carried out for the North-South Component of EL-Centro Ground motion, 1940.In this analysis, the stiffness and damping properties have been considered for improving the seismic performance of the existing structure. By keeping the Group number as it is, using different sections, the geometric properties of the given angle section are optimized to optimized angle section and optimized tubular section. For cross braces, the damping value is varied ranging from 5%-25% for above sections. In this analysis, the displacement at top cross-arm of the tower is considered as the main parameter for conservative results. Finally the results obtained are regarding possible improvements in the analysis of the existing structure
Comparative Study on 4-Legged Transmission Line Tower With Different Bracings By Using Staad Pro
Journal of Advances and Scholarly Researches in Allied Education
The purpose of a transmission line tower is to support conductors carrying electrical power and one or two ground wires at suitable distances above the ground level and from each other. The transmission line towers cost about 28 to 43 per cent of the total cost of the transmission line. A transmission tower is a space truss and is an indeterminate structure.The increasing demand for electricity can be made more economical by developing different light weight configuration of transmission line tower.The present study reports the design and analysis of a steel lattice transmission line towers of a power system located in Pune. The design and analysis of the considered power system has been done using STAAD Pro. Under the design and analysis of the system, the effect of wind and earthquake loads were studied and the results so obtained were compared for wind zones III for four legged tower. Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all forces of nature like strong wind, earthquake load. The main objective of this project is to design and comparison between four legged 220 kV transmission line tower and its configuration as per Indian Standard (IS:800-2007 and IS:875-1987).
Structural Behaviour of Transmission Tower with Different Bracings under Wind Loading
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2023
India has a sizable population that is dispersed throughout the nation, and this population's high need for energy production results in the need for a sizable transmission and distribution system. The present work for the design of transmission towers with foundations for two distinct zones, each with a different basic wind speed and kind of terrain. The requirement of the members has also been optimised. With the aid of Staad.pro and MS Excel's VBA, this present work has completed. Three distinct bracing systems were contrasted based on a number of factors, including deflection, weight, the quantity of joints, and cost. STAAD.pro has used to analyse the tower under various loading conditions, and Excel-VBA interface has used to construct the connections and base. The technological analysis and economic design of transmission line tower constructions have been the main aims of the present work. Under the specified loading conditions scenarios for both zones, the K bracing tower showed the least deflection in terms of the deflection criterion.
Optimum Design of Transmission Towers Subjected to Wind and Earthquake Loading
Jordan Journal of Civil Engineering, 2013
Transmission towers (1S2 and 2S2-132 kV types) subjected to multiple combinations of wind, seismic and dead loads are optimally designed for least weight. The member areas and joint coordinates are treated as design variables. Members are designed to satisfy stress limits. Joint coordinate variables are linked to reduce the number of independent design variables. The optimization problem is divided into two design spaces. While changing the coordinate variables, using Hooke and Jeeves method, the member areas are treated as dependent design variables. The sections used are: angle and pipe sections which represent the commonly used sections in lattice transmission towers, in addition to tube sections. The structural analysis and the fully stressed design are performed using STAAD pro v.2006. It is found that the 1S2 tower with angle section and X-bracing, under anti-cascade loading condition, has a reduction in weight of about 14% of the weight before optimization, while the reduction for 2S2 was 24% for the same conditions. For seismic loading conditions, the reductions were about 24% for 1S2 tower and 22% for 2S2 tower with angle section and X-bracing. The results showed that the 1S2 tower with pipe section has a weight of 85% of that with angle section, under the same loading condition, while for 2S2 tower, the weight with pipe section was about 88% of that with angle section.
Comparative Analysis of Transmission Tower
International Journal for Research in Applied Science and Engineering Technology, 2021
The electrical transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all forces of nature like strong wind, earthquake and snow load. Therefore transmission line towers should be designed considering both structural and electrical requirements for a safe and economical design. Modeling of transmission tower by using finite element method. the horizontal displacement (X-direction) is found to be maximum for the model-10 as compared to the other models. As the height goes on increasing the displacement found to be increasing. Also as the wind speed is increasing the displacement is also found to be increasing.
IRJET, 2020
This document presents a review of recent research conducted on the design and analysis of transmission line towers in different wind areas with the effects of wind loads and earthquakes using STAAD.ProV8i. A study reports the design and analysis of the self-supporting towers of the lattice transmission line of an energy supply system located in Mumbai and Mount Abu. Both cities are in the same seismic areas but in different wind zones. This study is important in terms of wind load because Mumbai is a coastal area and Mount Abu is a mountainous area with different wind speeds. The comparative analysis is carried out respecting the axial forces, the maximum properties of the bending section and the critical load conditions for both positions. Load calculations are done manually, but analysis and design results are obtained through STAAD.ProV8i..
Analysis and Design of Transmission Tower Using STAAD.PRO
Formulation of transmission towers is tendered in a perspective of confronting high voltage transmitting conductors and insulators to stand in need of altitude from the ground level. For the same purpose a transmission tower is replicated with similar context of height 49m and fetching a 220KV double circuit conductor, maneuvered with STAAD PRO. The contemplations from both structural and electrical fields are viewed in designing transmission line towers, for safe and economic aspects. According to IS 800-2007, the wind forces are much prominent on the tower, conductors and insulators, besides the self-weight. This work is focused in optimizing the transmission tower with employing the 'X' and 'K' bracings, and by varying the sections, examined using Static analysis. The upshots of using 'X' bracing to 'K' bracing are the appraisable reduction in the weight of the structure by 6% and having the displacement values supplemented.
Parametric Studies on Transmission Line Tower Due to Dynamic Loading
India has a large population residing all over the country and the electricity need of this population creates requirements of large transmission and distribution system. Transmission line is an integrated system consisting of conductor subsystem, ground wire subsystem and one system for each category of support structure. Structural system of transmission line represents a significant portion of the cost of the line and they play an important role in the reliable power transmission. This thesis is concerned with the performance of three types of transmission line towers with varying heights under seismic and wind induced dynamic loads. Wind loads are considered as per IS 802(part1/sec1):1995, IS 875(part3): 1987 and seismic load as per IS 1893(part1):2002. The finite element analyses of transmission line tower involves modal analysis, equivalent static, response spectrum, time history and wind analysis with gust factor. The results obtained from the analyses are compared and the conclusions are drawn