Pdf computerbased mechanical design of overhead lines. The power transmission line is one of the major components of an electric power system. Jan 15, 2015 mechanical design of overhead lines 2. Defines the typical asset requirements required to facilitate a connection to a transmission network. The underground cables are rarely used for power transmission due to two main reasons. The inductive reactance at 60 hz for overhead lines is typically much larger than the resistance of the line. Ensure adequate transmission from resources to serve loads in a reliable and economical manner. An overhead power line is an electric power transmission line suspended by towers or poles. Overhead ac transmission lines carry three phase current and the transmission voltages are between the range of 69kv and 765kv. Discrepancy between installed line tensions and the tension used for calculation leads to errors which touch on almost every facet of line design, including. Mechanical design calculation formulas pdf jobs, employment.
Currently, the highest voltage lines comprising the north american power grid are at 765 kv. Electrical design of overhead power transmission lines discusses everything electrical engineering students and practicing engineers need to know to effectively design overhead power lines. Pdf mechanical calculation of power lines and strands in. Overhead transmission lines are expected to withstand climatic conditions and other outside disturbances. Transmission towers have to carry the heavy transmission conductor at a sufficient safe height from ground. The fundamentals of overhead transmission line design course provides participants with a fundamental understanding of the electrical and mechanical design of ac 69765 kv transmission lines. They need to understand how the physical components of transmission lines fit into an integrated design. A single and global transmission line design software and distribution line design software for all the mechanical design of overhead lines from land survey to final. Full detail design of hvac lines up to 765kv and hvdc up to 800kv providing support to over 31 000 km of transmission lines 220kv,275kv,400kv, 533kvhvdc, 765kv 340 000 km of distribution lines 11kv, 22kv,66kv, 88kv,2kv, busy with designs for over 8. Firstly, power is generally transmitted over long distances to load centers. What are the main components of overhead transmission of. Whatever your transmission need, we provide engineering and technical support to ensure that you have the most economical and effective overhead conductor design for your application and environment. The breakout sessions provide attendees with an excellent platform to exchange knowledge and information on new initiatives and recent technological advancements.
Therefore, for distribution lines and most transmission lines, the midspan span conductor sag is approximated by the first term of the above equation. Transmission and distribution conductor tension in overhead. Generator files application deposit requiredamounts have increased to cover costs and ensure applicants have real projects type of service, location, mws, commercial operation. Cowritten by experts in power engineering, this detailed guide addresses component selection and design, current ieee standards, loadflow analysis, power. Electrical transmission tower types and design electrical4u. Mechanical calculation of power lines and strands in overhead transmission lines article pdf available in matec web of conferences 50. Transmission line design software multilingual by gc. The guide should be particularly helpful to relatively. Electrical and mechanical design criteria for ehv and uhv. Mechanical design of overhead lines free download as powerpoint presentation. These are the structures towerspoles that support the transmission. Transmission line design software multilingual by gc software. These lowvoltage lines generally traverse only a few hundred yards. Transmission line design manual bureau of reclamation.
Mechanical design of overhead lines 161 although hard drawing decreases the electrical conductivity slightly yet it increases the tensile strength considerably. High voltage or transmission overhead lines, medium. Since most of the insulation is provided by air, overhead power lines are generally the lowestcost method of power transmission for large quantities of. It is a good blend of fundamental theory with practical design guidelines for overhead transmission lines, providing the basic groundwork for students as well as practicing power engineers, with material generally not found in one convenient book. Mechanical design of overhead lines cedengineering. Therefore, proper choice of material and size of the conductor is of considerable importance.
Mechanical design of overhead transmission lines by. Sep 03, 2012 complete coverage of power line design and implementation this text provides the essential fundamentals of transmission line design. Design and optimization of overhead transmission lines using. Design of electrical transmission lines structures and foundations will provide industry professionals a valuable resource from which to learn. Towers for support of the lines are made of wood asgrown or laminated, steel either lattice. Introduction to over head tm line universally adopted. May 15, 2018 the main supporting unit of overhead transmission line is transmission tower. In ptec 500 participants gain an understanding of the overhead line theory and application, including planning. Complete coverage of power line design and implementation this text provides the essential fundamentals of transmission line design. March 12 to 15, 2016 towerplspole training march 1617, 2016 the courses daily schedule.
A unique user profile that will allow you to manage your current subscriptions including online access the ability to create favorites lists down to the article level. The transmission of electric energy can be done in alternate current or continuous current and can also be done by using underground cables or overhead lines. This report focuses on transmission lines, which operate at voltages of 115 kv and higher. Overhead power lines are structures that are used in electric power transmission and distribution over long distance. Electrical design of overhead power transmission lines. Since the phases of a highvoltage overhead transmission line must be spaced further apart to ensure proper insulation, a highvoltage line will have a higher inductance than a lowvoltage line. Pdf this paper considers the mechanical design of overhead transmission lines, taking into account the influence of the linear expansion of super. An overhead line may be used to or distribute electrictransfer power. An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances. The first term of the equation is identical to the equation for a parabolic curve. Chapter 6 mechanical design of overhead lines notes. Principles of mechanical design in overhead transmission lines. The technical specifications outlined in this section covers the scope of works for the following 2 kv overhead transmission lines.
While constructing an overhead line, it has to be verified that line mechanical strength is such so as to provideagainst the most probable weather conditions. The main features of the mechanical overhead lines design software are. A unique user profile that will allow you to manage your current subscriptions including online access. All associated works with the design, construction and commissioning will form part of this turnkey epc project. Pdf mechanical design of high voltage overhead transmission.
Mechanical design of overhead lines ced engineering. Mechanical design manual for overhead distribution lines april 1982. Mechanical design of overhead lines linkedin slideshare. Contractors for the design, installation and commissioning of high voltage overhead transmission line ohtl. The design of a transmission line depends on four electrical parameters. Engineers need an overview of the important aspects contemporary applications of transmission lines.
This bulletin is available on the rural utilities service website at. Depending on the level of voltage of the transmission of electric energy there can be three kinds of overhead lines. Full detail design of hvac lines up to 765kv and hvdc up to 800kv providing support to over 31 000 km of transmission lines 220kv,275kv,400kv, 533kvhvdc, 765kv 340 000 km of distribution lines 11kv, 22kv,66kv, 88kv,2kv, busy with designs for over 8 000km of new transmission lines to be built in next 10 years. The mechanics of overhead distribution line conductors.
Its major function is to transport electric energy, with minimal losses, from the power sources to the load centers, usually separated by long distances. Mechanical design of transmission lines overhead line insulators. More precisely, the task in designing of the overhead line profile is to size poles. So transmission tower designing is an important engineering job. Design and optimization of overhead transmission lines. Mechanical design of overhead lines insulator electricity. Mechanical design of overhead transmission lines nature scribd. Transmission and distribution conductor tension in. Pdf mechanical design of overhead lines vnit electrical. The contract outlines the construction of 245km of 2kv single circuit overhead transmission line connecting the proposed substation at kabarnet, nyahururu, narok, bomet. Presentation of power electronics in respect of resp. Overhead transmission lines shorter than 80 km 50 miles can be modeled as a series resistance and inductance, since the shunt capacitance can be neglected over short distances.
Electric power can be carried either by underground cables or overhead transmission and distribution lines. A single and global transmission line design software and distribution line design software for all the mechanical design of overhead lines from land survey to final document production printed and plotted. Conductor material used for transmission and distribution. The proper overhead line operation depends to a big extent upon its mechanical design. So transmission tower designing is an important engineering job where all three basic engineering concepts, civil, mechanical. Sm maximum allowable span base on horizontal clearances sr design ruling span dm defined sag limit table 3. Mechanical design of overhead transmission lines conductor material the conductor is one of the important items as most of the capital outlay is invested for it. The many crossreferences and examples should be of great benefit to engineers performing design work for rus borrower transmission lines. Transmission lines high level electrical design criteria. Since most of the insulation is provided by air, overhead power lines are generally the lowestcost method of transmission for large quantities of electric power. The conductor is one of the important items as most of the capital outlay is invested for it. The applied forces must be tolerated mechanically by structural components of transmission line.
Since most of the insulation is provided by air, overhead power lines are generally the lowestcost method of transmission for large quantities of electric energy. Corona phenomenon, factors affecting corona, critical voltages and power loss, radio interference. Transpowr bare overhead transmission conductor astm specifications and other overhead wires u. How to design tranmission lines engineering basics once the route and length of a transmission or distribution line has been decided upon and the correct conductor size and type selected to carry the system load safely and economically, there are still several mechanical considerations which will have an effect on installation practices and. The results are presented of a program devoted to the selection of electrical and mechanical design criteria and parameters for overhead power transmission lines for ac systems rated at from 345 to 1100 kv and for dc systems rated at from 600 to 1200 kv. Standard for distribution line design overhead ergon energy. In addition to that all towers have to sustain all kinds of natural calamities. It consists of one or more conductors commonly multiples of three suspended by towers or poles. Mechanical design of overhead electrical transmission lines. At a glance the fundamentals of overhead transmission line design course provides participants with a fundamental understanding of the electrical and mechanical design of ac 69765 kv transmission lines. Design and optimization of overhead transmission lines using plscadd and tower software theoretical and practical training course dates plscadd training. March 12 to 15, 2016 towerplspole training march 1617, 2016 the courses daily schedule is from 8h30 to h00 and from 14h00 to 16h30 location.
Mar 21, 2016 mechanical design of overhead lines 1. Since the spacing between lines in buried cables is very small, series inductance of cables is much smaller than the inductance of overhead lines. Mechanical design of overhead transmission lines free download as pdf file. Extract data from pdf to excel simple retyping project in which we have scanned text files which you need to convert in word file. In ptec 500 participants gain an understanding of the. Information is included on the environmental effects, i. The detailed overview and design instruction, along with references to applicable standards, will help younger industry professionals more quickly understand the basic design principles. How to design tranmission lines engineering basics. The main supporting unit of overhead transmission line is transmission tower.
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