Electric traction has many advantages as compared to other nonelectrical systems of traction including steam traction. Work under this section shall include all materials and installation for traction elevators including gearless pedestrian elevators, gearless patient elevators, and geared service elevators, as shown and detailed on the drawings and specified herein, including. The neutral section is a dead zone and therefore, the locomotive has to negotiate the section in momentum. With a proper maintenance of the ohe the contact wire is expected to have a life of about 30 years, with average traffic density and conditions of pollution. Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains at a distance from the energy supply point. Electrical clearance the minimum electrical clearances vertical and horizontal to be maintained under the worst condition of temperature, wind, etc. Find the most uptodate version of en 50119 at engineering360. Traction voltage system electric traction introduced in mumbai area on 1500 volt dc traction in 1925. Thomas byrne, opac, otc university of california san diego medical center san diego, california preface. In a neutral section of an overhead electric traction system the contact wire and at least one catenary wire of one of two adjacent sections of the overhead electric traction system are secured to one end of an elongate insulated runner and the contact wire and at least one catenary wire of the other sections are secured to the other end of said elongate insulated runner or to one end of a. Electric traction system 1 electric traction system presented by amit raj roll no.
This span gives an effective neutral section of 41 m length by proper selection of staggers. Nov 30, 2015 the electric traction system is the most efficient of all other traction system such as steam and internal combustion ic engine type systems. Procedure to book out the overhead traction power whenever it is necessary to make the train overhead power unavailable for electric trains during electric train running times and a signaller is on duty, the following procedure will take place. A railway electrification system supplies electric power to railway trains and trams without an onboard prime mover or local fuel supply. It is used for local delivery of good in large towns with maximum daily run of 50 to 60 km. The machineroomless elevator is the result of technological advancements that often allow a significant reduction in the size of the electric motors used with traction equipment. Equipment for overhead power lines stringing tesmec. Electric traction will continue to play a dominant role in the railway since it is an. Electric railways use either electric locomotives hauling passengers or freight in separate cars, electric multiple units passenger cars with their own motors or both.
Provision of overhead equipment, booster transformers and return conductor. Because electric traction systems use the same running rails for traction return current, it is necessary for the two electrical systems to be electrically isolated. Electric traction elevators shall be provided in all buildings with three or more floors above or below the main entry or more than 240 of travel above or below the main entry. There are various systems of traction prevailing in our country such as steam engine drive, electric drive. Electric power technology in the railway industry refers to the means of supplying goodquality electric power to the electric motors. For better utilization of traction assets, outage of any traction equipment from service should be minimum without compromising on safety of the equipment and personnel. In the united states, newer electrified portions of the northeast corridor i.
Electric traction systems seminar report a traction system causes the propulsion of vehicle in which tractive or driving force is obtained from various devices such as diesel engine drives. Similar purpose in ohe is achieved through overlaps. These, together with the height of steam locomotive chimneys, set the. Provision of power supply equipment, transmission lines, traction substations. Pantograph the device on top of the train that collects electric current from the contact wire to power the train. A short neutral section ptfe type is provided opposite the traction sub station to avoid the need of lowering the. In this article, the generic term overhead line is used, as used by the international union of railways. Electric traction and mrl transit elevatorescalator consortium 6. The most popular line voltages for overhead wire supply systems 1500vdc and 3000v dc. It offers several benefits over other systems, including quick start and stop, very efficient, pollutionfree, easy to handle and easy speed control. An experimental study of the overhead contact system for electric traction at 25kv. Overlap is defined as an arrangement where two set of contact wire runs together in parallel for a short distance without any mechanical or electrical connectivity but facilitating smooth movement of pantograph over it.
Power failure for few minutes can cause traffic dislocation for hours. Unless the traffic to be handled is heavy, electric traction becomes uneconomical. An ac traction system has become very popular nowadays, and it is more often used in most of the traction systems due to several advantages, such as quick availability and generation of ac that can be easily stepped up or down, easy controlling of ac motors, less number of substations requirement, and the presence of light overhead catenaries that transfer low. Pdf high speed protection scheme for traction ohe of 25 kv ac.
Overlap each length of the contact wire overlaps with the next so that the pantograph slides smoothly from one to the other. Signals and communication systems will need to be replaced or upgraded. Overhead traction equipment ohte ohte machines are designed to give safe access to the electrical structure for maintenance. These newly designed permanent magnet motors pmm allow the manufacturers to locate the machines in the hoistway overhead, thus eliminating the need for a machine. There are many other voltage systems used for railway electrification systems around the world, and the list of current systems for electric rail traction covers both standard voltage and nonstandard voltage systems. Ole overhead line electrification equipment, which supplies electric power to the trains. Act of drawing or state of being drawn propulsion of vehicle is called tractions. Network rail a guide to overhead electrification bath and north. Overhead lines simple english wikipedia, the free encyclopedia.
Jun 27, 20 electric traction the system which use electrical power for traction system i. Monitoring of condition of the equipment by reliable means is essential for following the system of need based maintenance i. In countries where 60 hz is the normal grid power frequency, 25 kv at 60 hz is used for the railway electrification. In electric traction systems in which power is supplied from an overhead contact wire via a pantograph, the mechanical design of the contact wire and its supporting equipment is clearly of importance in relation to the problem of current collection at high speed. Attention is drawn to the presence in some areas of electric traction equipment associated with either overhead line equipment above and at track level andor third or fourth conductor rails at track level. A dynamic model for studying the behaviour of the overhead. The most vital factor against electric traction is the initial high cost of laying out overhead electric supply system. Geared electric traction elevators gearless electric traction elevators governor roped hydraulic safeties sheaves traction 5 electric traction and mrl elevators thinking back to course 200, what are some things you remember about electric traction elevators.
A dynamic model for studying the behaviour of the overhead equipment used in electric railway traction. By electric traction is meant locomotion in which the driving or tractive force is obtained from electric motors. Railway technology today 3 edited by kanji wako railway. Electric traction part 11 types of traction systems duration. Jun 18, 20 dc traction units use direct current drawn from either a conductor rail oran overhead line. This may be abbreviated to ohl or ohle for overhead line equipment. Pdf this paper deals with study of thyristorized electric locomotives and its. An overhead line is designed on the principle of one or more overhead wires or rails, particularly in tunnels situated over rail tracks, raised to a high electrical potential by connection. Article information, pdf download for railway overhead contact systems.
It is used in electric trains, tramcars, trolley buses and dieselelectric vehicles etc. They are attached to overhead structures or on the wall of. Each feeder is controlled by a single pole circuit breaker equipped with protective devices. Alan baxter network rail guide to overhead electrification 2787albguneoh000001 february 2015 rev 10 1 of 52 1. Dynamicmodel studies of overhead equipment for electric. Pantograph motion on a nearlyuniform railway overhead line. These machines have various auxiliary equipment to ensure the safety of staff and ease of handling, cleaning and replacing of ohte components. May 22, 2018 the electric traction system ppt briefly discusses the types, supply system, traction motors, braking system, advantages and disadvantages and recent trends. A system of conductors equipments carrying traction power from traction sub station to electric locomotive. Overhead line equipment or ole is the name railway engineers give. The delhi metro uses 25kv ac overhead traction with a catenary system on the groundlevel and elevated routes, and uses a rather unusual rigid catenary or overhead power rail in the underground tunnel sections line 2. Overhead line electrification equipment, which supplies electric power to the.
Acdc railway electrification and protection r d white. It primarily consists of power conversion technology at substations, feeding circuits for dc and ac feeding systems, and the structure, materials, measurement, and maintenance of the electric overhead lines. Electrical equipment ocs included of the two main tracks are not separated electrically. We would like to acknowledge grateful appreciation to those who contributed their time and expertise in the development of the ninth editon of the zimmer traction handbook. Chapter 1 railway electrification system chapter 2 traction power network chapter 3 railway electric traction chapter 4 electric locomotive chapter 5 pantograph rail chapter 6 electric multiple unit chapter 7 trolley pole chapter 8 third rail chapter 9 overhead lines chapter 10 groundlevel power supply.
Railway electrification part 2 overhead equipment duration. An experimental study of the overhead contact system for electric traction at 25 kv. Overhead line equipment is energised at 25,000 volts ac. Either system carries a potentially lethal electric current and the close proximity to this equipment can. Operating procedures overhead and electrical equipment. The arrangement consists of five spans of overhead equipment in which the central span has to be strictly of 49.
Overhead catenary system preliminary description 7 characteristichs of power supply 7. Mar 29, 2014 this is not possible in case of overhead contact and catenary wire. The permissible range of voltages allowed for the standardised voltages is as stated in standards bs en 50163 and iec 60850. Harddrawn gooved copper contact wire of 107 mm 2 cross sectional area when new is used in the 25 kv electric traction system. Ppt electric traction system powerpoint presentation free. Section switches are air break switches controlling part of an electric traction section. This is not possible in case of overhead contact and catenary wire. Mar 25, 2014 neutral section is defined as short insulated dead overhead equipment separating sectors fed by two adjacent substations which are normally connected to different phases. February 20 page 1 of 21 2020 fdg section 14 21 00. Or electric traction means a locomotion in which the driving force is obtained from electric motors.
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