Overhead line design pdf

This standard is only applicable to new overhead lines and is not. An overhead line may be used to or distribute electrictransfer power. The scope of the seminar will cover electrical, structural and detailed line design and will be. Electra is a powerful overhead power line cad design software which combines design and documentation production workflows for electrical distribution design. The key interface to be considered in ole design is that of the contact wire page 91, figure 84 label raising cylinder and primary insulation should read raising cylinder and primary suspension for steel masts, the form that the mast takes is largely a matter of local preference and the relative cost of holt hot. The manual was designed to better assist transmission line engineers and system planners in the selection of overhead conductors and to provide general guidance in transmission line design andor uprating. Overhead lines design main components of overhead lines. Many of the requirements of the codes and standards listed below are hardcoded in our software and can optionally be selected by name.

Accordingly, the amount of literature describing design techniques for overhead line foundations is relatively small compared to the literature available for more traditional civil engineering foundation design practice. Overhead 345 kv transmission line design process a project. These lowvoltage lines generally traverse only a few hundred yards. Aluminum is preferred over copper for its lower cost and lighter weight, however, this comes at the price of some energy loss that doesnt occur with copper. We construct high voltage and extra high voltage overhead power lines, in italy and abroad, using qualified suppliers of proven professionalism, following the production of every single basic element that constitutes an electric line from design to deployment. At distribution voltages, overhead line design tends to consist of both simple structural engineering and electrical engineering. Construction of transmission and distribution lines. Specification for construction of overhead lines between 1kv and 33kv with aaac conductors. Scope this specification covers the design, manufacture, testing, supply, delivery, and performance requirements of bare overhead conductors, and earthing conductors for use in the networks of the moe. Overhead power lines planning, design, construction nolasco.

However, this technology has continuously developed, for example, adjusting the design of the lines to new transmission needs and to available rightsofway, and to accommodate environmental concerns or resources. Pdf computerbased mechanical design of overhead lines. Overhead power lines planning, design, construction. If you continue browsing the site, you agree to the use of cookies on this website. It is also applicable to many aspects of distribution line installations.

Initial planning studies typically only consider balanced, steadystate operation. These voltage values, which are all line to line values are 66kv, 22kv, 11kv, 6. The standards contain general requirements for constructing substation and transmission line. The standards contain general requirements for constructing substation and transmission line projects. Overhead lines have more advantages than underground lines. Variable steel core stranding enables desired strength to be achieved without sacrificing ampacity. It provides sophisticated design and analyzing tools to optimize transmission network designs in plan and profile. The project is assigned a unique work request number for the design and construction process.

In 1982 overhead power lines were built in russia between elektrostal and the power station at ekibastusz, this was a threephase alternating current line at 1200 kv power line ekibastuzkokshetau. Overhead power lines presents not only the scientific and engineering basis for the electric and mechanical design, but also comprehensively describes all aspects of most recent technology, including the selection and design of components such as. For information on the above or on electrical safety programs, contact centerpoint energy s public safety department as. Standard design transmission lines type 3td 115kv 3pole tension dead end. An approachable and comprehensive study of ole for beginners. Firstly, power is generally transmitted over long distances to load centres.

Electrical design of overhead power transmission lines. The standards, project specifications, standard drawings, and project drawings together completely describe the project to be constructed. Standards the equipment shall comply with the latest editions of, and amendments to, the. Asnzs 7000 overhead line standard limit state design principles for various line components security classes and design working life more detailed coverage on electrical design and earthing using eg0 risk based earthing approach covers steel lattice, steel poles, concrete poles, wood poles and crossarms. High mechanical strength to withstand the weight of conductors and wind loads etc. Mechanical design of overhead lines ced engineering. Overhead power lines presents not only the scientific and engineering basis for the electric and mechanical design, but also comprehensively describes all aspects of most recent technology, including the selection and design of components such as conductors, insulators, fittings, supports and foundations. Popovic, in practical methods for analysis and design of hv installation grounding systems, 2018. The unique geometry and electrical characteristics of a bold transmission line can be designed and constructed in a manner. Overhead power line design and construction roda spa. Specification for construction of hv overhead lines up to 33kv on. The design of the overhead contact line in a railway system should be done in order to achieve the best currentcollection possible, either if it is a tramway system, a suburban system or a longer distance line commuters, regional trains and medium or long distance. Overhead design and construction fundamentals presenter.

Pdf mechanical design of overhead lines vnit electrical. D transmission line standards wood pole structures overhead ground wire assembly 77. Design codes, standards, and manuals used in power line systems software. This standard specifies the general requirements that shall be met for the design and construction of new overhead lines to ensure that the line is suitable for its intended purpose, and provides acceptable levels of safety for construction, maintenance and operation, and meets requirements for environmental considerations. Overhead line design electrical conductor strength of. The selected foundation design for a particular tower must provide an economical, reliable support for the life of the line. Overview seminar contents cpd recognition this training program is designed to meet the cont participants. As a result, when the feeding line section between the tested and. Adverse weather conditions of high wind and low temperatures can lead to power outages. Standard for subtransmission overhead line design version 4. An approachable and comprehensive study of ole for. Design guide for overhead distribution systems eep.

Overhead power lines for conditions prevailing in south africa standard specification for medium and low voltage electricity distribution works part b03. Ac transmission line impedance parameters ac transmission is done through 3phase systems. Mechanical design of overhead lines cedengineering. These standards ensure meeting of ergon energys requirements. In general, the line supports should have the following properties. The project is assigned a unique work request number for the design and. Typically, the main elements of an overhead line are. The manual was designed to better assist transmission line engineers and system planners in the selection of overhead conductors and to provide general guidance in transmission line design. Anatomy of a transmission line overhead transmission line components conductor alternatives typically aluminum or copper conductors are used. Overview the ehv 33kv overhead line network is a strategic asset, connecting our grid and primary substations in rural. The blue book revision committee for the 2017 edition consisted of the following employees.

An introduction to electric power transmission presentation. Mar 04, 2014 title slide of overhead power lines planning, design, construction nolasco, et al slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The satisfactory performance of a transmissionline greatly depends on its mechanical design. Some of these values are rarely used in public distribution networks but are common in private networks in large industrial sites eg 3. In general, the main components of an overhead line are. Towers for support of the lines are made of wood asgrown or laminated, steel either lattice. Within this context, the construction of a new ohl remains both complex and challenging. Pump termination 1 12 2 power vac std intake suction line single models p3, p5, p7 twin models p6, p10, p14 type pvc sch 40 pipe recommended for main trunk and branch lines line size refer to.

Transmission line vs distribution line transmission line normally carries electricity at voltages of 69 kv or greater and is used to transmit electric power over relatively long distances, usually from a central generating station to main substations. While constructing an overhead line, it should be ensured that mechanical strength of the line is such so as to provide against the most probable weather conditions. Vacuum plumbing layout recommendations applies to models. Pdf beside the performance, the safety level according to the actual standards is a compulsory condition for distribution grids operation. Mechanical design of overhead lines 161 although hard drawing decreases the electrical conductivity slightly yet it increases the tensile strength considerably. Issues that are involved in the design, construction, operation, reliability, protection and maintenance of overhead distribution, as well as safety awareness will be discussed. Overhead line reliability and safety have been heavily criticised in recent years and so there is a need to address the issues of future overhead line design. It is also ideally suited for network planning staff that require a basic understanding of overhead line design for planning purposes. Pdf sagtension calculation program for wood pole overhead. The intent of this guide, along with ieee standard 524. An introduction to electric power transmission table of content toc glossary about transmission lines electricity generation and delivery transmission line ownership and funding anatomy of a transmission line buildingmaintaining transmission lines planning the system permitting potential environmental impacts. Standard for subtransmission overhead line design 1 overview 1.

This report focuses on transmission lines, which operate at voltages of 115 kv and higher. C transmission line standards suspension insulator assemblies single string. Testing, transmission line design, transmission line scada control and metering, overhead and underground distribution line design, distribution system studies and planning, as well as reports and studies for need, placement, and planning of new substations and new transmission lines as required by the public utility commissionpuc. Since overhead transmission lines are uninsulated, design of these lines requires minimum clearances to be observed to maintain safety. This standard defines the performance design parameters for overhead transmission lines constructed to connect to and form part of the transgrid network. Pdf electrical design of overhead power transmission. Line engineering services 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. Colin lee principal engineer asset management energex email. Transmission line design manual bureau of reclamation. The underground cables are rarely used for power transmission due to two main reasons. Farr, has more than 30 years of transmission line design experience as an electrical engineer with the bureau of reclamation. Dec 15, 2018 the key interface to be considered in ole design is that of the contact wire page 91, figure 84 label raising cylinder and primary insulation should read raising cylinder and primary suspension for steel masts, the form that the mast takes is largely a matter of local preference and the relative cost of holt hot.

Pdf electrical design of overhead power transmission lines. Whether it is training for power system engineers, commissioning engineers, control room operators, or field maintenance and repair personnel, siemens power academy td north america na and the consultants at siemens energy inc. 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. Standard for distribution line design overhead ergon energy.

The course provides a high level of insight and knowledge to overhead line design, covering all aspects of the latest technologies involved electrical, mechanical, structural and civil. The proper overhead line operation depends to a big extent upon its mechanical design. An overhead transmission line may be used to transfer electric power. The basic elements of overhead power line technology have been known for many years. More over, a deeper study about these parameters is undertaken here, by varying the frequency and the conduc. This handbook is a companion to and is intended to be read in conjunction with the overhead line design standard, asnzs 7000, overhead line design detailed procedures referred to as asnzs 7000 in this handbook, which is a comprehensive treatment on the design of overhead power lines and which supersedes the ena cb1 guidelines for the. Such maintenance and life extension work ensures that lines continue to comply with the original design standards and remain safe and fit for purpose. Ns220 overhead design manual amendment no 0 nw000s0092 uncontrolled if printed page 2 of 268 issue for issue to all ausgrid and accredited service providers staff involved with the design of overhead distribution lines, and is for. Fundamentals of overhead distribution systems euci. Api residential 2016 program topics to cover asnzs7000 overhead line design standard overhead line ratings transmission vs distribution distribution design aspects major line components. 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. External companies should not use these standards to construct nonergon energy assets. Overhead lines ohls comprise one of the major power engineering technologies, and although the basic principles of ohl design were mostly established at the dawn of electrical power systems, it is a technology that is subject to ongoing development and change.

Transmission line design manual, united states department of the interior water and power resource service, 1980 by holland h. Now let us discuss the about overhead lines and their design. An overhead power line is an electric power transmission line suspended by towers or poles. Since most of the insulation is provided by air, overhead power lines. Transmission line design information in these notes, i would like to provide you with some background information on ac transmission lines. Distribution line normally considered to be a line that carries electricity at lower. Feb 26, 2003 overhead power lines presents not only the scientific and engineering basis for the electric and mechanical design, but also comprehensively describes all aspects of most recent technology, including the selection and design of components such as conductors, insulators, fittings, supports and foundations. Another program that is used for the calculation of the parameters of overhead lines is the program line constants from atpemtp. The latest work on line design is in consequence of the revised overhead line regulation statutory instrument 55, 1970, and the industrys adoption of the metric system. Overhead lines are also used in contemporary hv distribution networks, especially in suburban areas, or in areas with a lower degree of urbanization. The successful operation of an overhead line depends to a great extent upon the mechanical design of the line.

Currently, the highest voltage lines comprising the north american power grid are at 765 kv. 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. This chapter looks at some of the fundamental steps that are adopted in developing a new overhead line wood pole design for the uk environment together with some historical references and. Asset inspection and condition assessment policy asset01021. The supporting structures for overhead line conductors are various types of poles and towers called line support. Farr conductor design and behavior sagtension calculation methods for overhead lines, cigre brochure 324, task force b2.

However, where existing overhead lines are proposed to be altered such that elements of the overhead line may be overloaded or overstressed to the original design standard. Design guide for overhead distribution systems photo credit. Lecture notes on power system engineering ii subject code. Your goto guide for overhead conductors and line design. Principles of mechanical design in overhead transmission lines.