What are the main components of overhead transmission of. University of craiova, faculty of electrical engineering, electrical engineering. Mechanical design of overhead transmission lines by. Mechanical design of overhead lines insulator electricity. Wisconsin that provides wholesale electrical energy to 25 member cooperatives and. Conductor material the conductor material used for transmission and distribution of electric.
Overhead power lines transmission and distribution lines are suspended on poletower supports. Mechanical design of overhead lines continuing education. These are the structures towerspoles that support the transmission. Cowritten by experts in power engineering, this detailed guide addresses component selection and design, current ieee. The chapters on line survey, construction and maintenance address. Now let us discuss the about overhead lines and their design. Corona corona electrical breakdown of the air near high voltage conductors into charged particles. 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. Transmission lines tls a tl is a major component of an electrical power system. Typically used conductor materials for overhead lines are copper, aluminium, steelcored aluminium, galvanised steel and cadmium copper. The proper overhead line operation depends to a big extent upon its mechanical design. The underground cables are rarely used for power transmission due to two main reasons. Pdf electrical power system by jb gupta pdf download. The main features of the mechanical overhead lines design software are.
Westerns substations and transmission lines are under the jurisdiction of westerns power operation and maintenance staff and are subject to their standard operating procedures and regulations. Inductance of overhead transmission lines electrical. An introduction to electric power transmission presentation. With respect to visual impacts, hvdc overhead transmission lines offer several advantages over hvac lines of the same capacity. Mechanical design of transmission line electric power.
Overhead transmission line components electrical discharges. The overhead transmission line experiences vibrations in the vertical plane and there are two types of such vibrations, in addition to normal swinging in wind, called the aeoline vibrations or resonant vibrations or high frequency oscillations and galloping or dancing or low frequency vibrations. Electrical design of overhead power transmission lines. This paper considers the mechanical design of overhead transmission lines, taking. Inductance is the property by virtue of which a circuit opposes changes in the value of a varying current flowing through it. Corona can cause audible noise and radio and television interference, electromagnetic interference, insulation damage, etc.
Overhead transmission lines static mechanical support eep. Principles of mechanical design in overhead transmission lines. Electrical power system by jb gupta is very useful for basics ideas of power system and best for competitive exams and topics are covered in sufficient details. 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. Book name a course in power systems by jb gupta author j b gupta. While erecting an overhead line, it is very important that conductors are under safe tension. Pdf computerbased mechanical design of overhead lines.
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. Manual for transmission lines and substation construction. The guard ring introduces capacitance be mechanical design of overhead lines 171 tween metal fittings and the line conductor. Mechanical design of overhead electrical transmission lines, by edgar t. Electrical design of overhead power transmission lines discusses everything electrical engineering students and practicing engineers need to know to effectively design overhead power lines. Mechanical design of overhead lines 161 although hard drawing decreases the. Velimir lackovic electric power can be transferred either by underground cables or overhead lines.
The guard ring is contoured in such a way that shunt capacitance currents i1, i2 etc. The conductor material used for transmission and distribution of electric. The course provides a high level of insight and knowledge to overhead line design, covering all aspects of the latest technologies involved. Construction of transmission and distribution lines. Refer to the microstrip transmission line applet and design a 33 ohm microstrip. Design of electrical transmission lines structures and foundations will provide industry professionals a valuable resource from which to learn. Overhead lines have more advantages than underground lines. Mechanical design of overhead lines free download as powerpoint presentation. Information is included on the environmental effects, i. Voltage distribution in suspension type insulators, method of equalizing, voltage distribution, economic use of insulators.
The underground cables are not commonly used for power transmission for two main reasons. Aluminum alloy conductors considering the heating from the electrical. The detailed overview and design instruction, along with references to applicable standards, will help younger industry professionals more quickly understand the basic design principles. Ieee electrical insultation magazine electrical design of overhead power transmission lines discusses everything electrical engineering students and practicing engineers need to know to effectively design overhead power lines. Mechanical design of overhead electrical transmission. Ensure adequate transmission from resources to serve loads in a reliable and economical manner. Electrical and mechanical design criteria for ehv and uhv. Therefore, proper choice of material and size of the conductor is of considerable importance. Overhead lines design main components of overhead lines. The selection of a particular material is dependant onthe cost, the needed electrical and mechanical characteristics and the local conditions. Mechanical design of overhead electrical transmission lines nature. Bipolar hvdc transmission lines have two conductors, and thus are simpler in design than comparable threephase hvac lines with three conductors. Mechanical design of overhead transmission line, sag and stress calculation, tension and. Transmission line design manual bureau of reclamation.
Pdf mechanical design of overhead lines vnit electrical. Pdf mechanical design of high voltage overhead transmission. As an expert player in this field and involved in numerous projects every year, dnv gl offers this training course on overhead lines ohl. Underground cables are a viable alternative to overhead transmission lines when proper consideration is given to the many details of using these types of systems. Assume we have a transmission line in which air separated the two perfect conductors. The design of a transmission line has to satisfy electrical as well as mechanical considerations. Overhead line ratings transmission vs distribution distribution design aspects. The fundamentals of overhead transmission line design course from siemens power academy td provides participants with a fundamental understanding of the electrical and mechanical design of ac 69765 kv transmission lines in ptec 500 participants gain an understanding of the overhead line theory and application, including planning, design, construction, operation and maintenance.
In the design of transmission lines, two main environmental factors are often considered temperature and ice loading. Provisions will be made to deenergize only those buses and circuits necessary to accomplish the work. Overhead power lines are structures that are used in electric power transmission and distribution over long distance. Request pdf on sep 1, 2012, masoud farzaneh and others published electrical design of overhead power transmission lines find, read and cite all the research you need on researchgate. This practical handbook is a comprehensive guide on evaluating the design, construction, and uprating of overhead transmission systems while containing information on best practices, new industry standards, and changes in the national electrical safety code. The conductor is one of the important items as most of the capital outlay is invested for it. These should have sufficient mechanical strength to withstand the worst probable weather conditions and other external interferences.
Mechanical design of high voltage overhead transmission lines with thermalresistant aluminum alloy conductors considering the heating from the electrical current conference paper. Mechanical factors focuses on strength of the conductors, insulator strings and support structures. Overhead transmission networks are an essential part of a countrys infrastructure. Mechanical design of overhead lines cedengineering. 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. Mechanical design of overhead electrical transmission lines. In any overhead transmission line, there will be multiple support structures. Therefore, a conductor between two supports must not be fully stretched and allowed to have a dip or sag. While the resistance of a circuit opposes the flow of both steady as well as varying currents. In this article we will discuss about the determination of inductance for overhead transmission lines.
Overhead lines electrical and mechanical design environmental impact of transmission lines computer skills. Your goto guide for overhead conductors and line design. Electric power can be carried either by underground cables or overhead transmission and distribution lines. Introduction to over head tm line universally adopted. Free book power transmission and distribution seconde edition by anthony j. Assume the impedance of the line is 50 ohm, phase constant is 20 radm and the operating frequency is 700mhz. Overhead lines clearance overhead electrical line safety patio overhead designs. Masters thesis submitted in partial fulfillment of the requirement for the degree of. An overhead line comprises mainly of conductors, line supports, insulators, and pole fittings. Suspended conductors are subjected to mechanical tension which must be under safe value. Fundamentals of overhead transmission line design course. Masters thesis submitted in partial fulfillment of the requirement for the degree of master of science and technology. Firstly, power is generally transmitted over long distances to load centers. Cables, however, have differing characteristics than overhead lines that must be factored into design, ratings.
If you are interested in electrical design of overhead power transmission lines pdf,please feel free to give your inquiry in the form or the email below. Cowritten by experts in power engineering, this detailed guide addresses component selection and design, current ieee standards, loadflow analysis, power. An overhead line may be used to or distribute electrictransfer power. 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. More detailed coverage on electrical design and earthing using eg0 risk based earthing approach covers steel lattice, steel poles, concrete poles, wood. He has worked on projects in the us and several other countries. Anatomy of a transmission line overhead transmission line components electrical discharges. Transmission lines require endurance against higher electrical and mechanical stresses in order to maintain the reliability of system operations. Mechanical design of high voltage overhead transmission lines with thermalresistant aluminum alloy conductors considering the heating from the electrical current conference paper pdf available. Manual for transmission lines and substation construction and maintenance activities volume i best management practices. Calculate the line inductancemeter and capacitance meter. Mechanical design of overhead lines ced engineering. Presentation of power electronics in respect of resp. You will find typical mpl sceneries and a study of how todays engineering insurance.
1265 1094 265 1523 366 126 371 1092 47 911 1548 668 1461 674 489 1500 824 956 592 986 693 1074 788 1119 714 1376 498 1155 1420 1541 764 942 723 50 1204 729 1254 57 1234 579