Introduction in 1964, tokaido shinkansen started the world first revenue service at high speed of over 200kmh. Winner of the standing ovation award for best powerpoint templates from presentations magazine. The mechanics involves conversion of overhead electrical powerdieselsteam power in rail horse power to haul a train encountering acceleration, train, grade, curve resistance and similarly braking. In return, the energy from the wheels turns the motor, which functions as a generator, converting energy normally wasted during coasting and braking into electricity, which is stored in a battery until needed by the electric motor. Thyristors in railway traction how can their effects be. Traction motor used for traction purpose is dc series motor, separately excited dc series motor, three phase induction motor, synchronous motor and permanent magnet synchronous motor. Auxiliary power supply is a low voltage acdc power supply for onboard devices with an important consideration for safety equipment. Pdf utilization of electrical energy pdf notes uee. Traction drive system for electric vehicles, using multilevel converters juan w. Topics covered electrical drives and traction pdf notes module 3 of vssut are listed below.
Our highspeed traction elevator products are ideal for buildings with the following features and service needs. An assessment of the overall performance of 3es5k alternatingcurrent electric locomotives with a collector drive in the regimes of traction and recuperative braking using the concrete example of a staged route between the khabarovsk2 and bikin stations of the far east railroad is given in this article. If you continue browsing the site, you agree to the use of cookies on this website. The electric traction consists o f some contact wires and it is supported at intervals by droppers from a simple or composite catenary wire 6. In electric traction for a trapezoidal speedtime curve. The ultimate test is the level of harmonic currents induced in the lightcurrent circuits. Full text of speedtime curve study of electric railway. If electric supply is used for driving a locomotive, the system is known as electric traction. Electric braking is superior to mechanical braking because of less wear on brake shoes, wheels and track. The electric traction system can be broadly divided into two groups. This book is a reproduction of that original, which has been scanned and cleaned by stateoftheart. This ppt helps to understand the concept of electric traction slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Gtu electrical power utilization and traction semester exam previous year question paper download pdf presentation on economies of traction diesel vs electric ebook download ppt diesel vs electric traction ppt. The railway traction systems under study, taking account of all the processes of. Free from smoke and flue gases hence used for underground and tubular railway. Speed time curves for different services trapezoidal and quadrilateral speed time curves. The main consideration is coordination with upstream and downstream protective devices, not so much the name used for the curves. System of electric traction mechanics of train movement. Utilization of electric power and electric traction j b. Thomas davenport, in brandon, vermont, erected a circular model railroad on which ran batterypowered locomotives or locomotives running on batterypowered rails in 1834. Ppt electric traction powerpoint presentation free to.
What is an electric locomotive systems and their types in. In ohe, or overhead electrification systems, the supply of electricity is through an overhead system of suspended cables known as the catenary. A comparison of the energy efficiency of the traction. Download pdf ebook on a first course on electrical drives by s. Around the world, proposals for new high speed lines are booming.
For a given choice of electric feeding technology, this simulation method determines the delay time of a train for a speci. Operation of traction vehicles with 3f induction motors in electric railway system 25kv, 50hz the. The area which lies below the tractive effort curves in the te curves graph is the product of forces and velocity. Many existing railway systems are experiencing ever increasing passenger and freight. Speedtime curve of main line service differs from those of urban and suburban services on following account a it has longer free running. In case of steam traction break blocks and wheels are likely to overheat on continuous. In an electric traction system the driving force to pull a train is generated by the traction motors.
The key to optimizing the power of the engine throughout the speed range of the track in question is to maximize this area. 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. Full text of speedtime curve study of electric railway load conditions. High speed railway capacity understanding the factors affecting capacity limits for a high speed railway by piers connor1 abstract high speed rail is the new railway.
Speed time curves for different services trapezoidal and quadrilateral. The moment of the train and their energy consumption can be studied by means of speedtime and speeddistance curves, it shows the speed at different time instances after start of run and speed at different distances from the starting point respectively. The curve may be broadly split into the following periods. Slop of the curve at any point gives the acceleration at the corresponding instant or speed. Traction drive system for electric vehicles, using.
Electric traction system 2 uploaded by santosh nayak. Among these curves, the speedtime curve is generally is used. Pdf intelligent traction control in electric vehicles. The curve gives the speed at various instants after the start of run directly. Before power electronics became available, electric traction was largely provided by d. Electrical drives and traction notes vssut module 3. Speed time, distance time and simplified speedtime curves, attractive effort for acceleration and propulsion, effective weight, train resistance, adhesive weight, specific energy output and consumption. Electric power systems research xxx 2016 xxxxxx fig.
Real traction and brake characteristics of a 3es5h electric. A railway electrification system supplies electrical energy to railway. The main advantage of this kind of topology is that it can generate almost perfect current or voltage waveforms. Utilization of electrical enrgy and electric traction. Require car speeds of 500 fpm up to 3500 fpm and levels from 15 to 120. In the figure shown below when the motor parameters are adjusted to provide speed torque curve 1, drive runs at the desired speed. Electric traction railway electrification encourages rural electrification as no special transmission line has to be run for this purpose. Speed time, distance time and simplified speed time curves, attractive effort for acceleration and propulsion, effective weight, train resistance, adhesive weight, specific energy output and consumption. A contact wire or contact cable actually carries the electricity. A book for students, electrical and mechanical engineers, superintendents of motive power and others by edward parris burch, first published in 1911, is a rare manuscript, the original residing in one of the great libraries of the world. From starting to the stage when locomotive attains maximum speed, the period is known as acceleration period, as the vehicle is constantly accelerated.
The simple resistor control was later superseded in dc traction by chopper control. Railway traction system pdf different types of railway traction and their importance in the. The permissible range of voltages allowed for the standardised voltages is as stated in standards bs en 50163 and iec 60850. Utilization of electric power and electric traction j b gupta pdf. Utilization of electrical energy pdf notes uee pdf notes. Electrical drives and traction pdf notes module 3 vssut. Whatever may be source or principle of working of traction motor, all provide tractive effort characteristics to encounter. Change in speed is achieved by varying the steady state motor speed torque curve so that motor torque equals the load torque at the new desired speed.
Evaluation of advantages of highspeed emus in the case of series 700 shinkansen highspeed train with igbt applied traction systems yoshiyasu hagiwara, mamoru tanaka, masayuki ueno central japan railway company, tokyo, japan 1. Ppt electric traction system powerpoint presentation. The rectangular conductor cross section is defined by its height h c and width w c, and the circular conductor by its diameter d c. Electric traction 1701 however, the steam locomotive suffers from the following disadvantages. The speedtime curve gives complete information of the moion of tt he train. Electric traction mcqs answers pdf electrical engineering. This chapter presents a general description of the elements that characterize a railway electric transportation systems. Act of drawing or being drawn is known as traction. In diesel electric railways because of variable train speed, a sort of compromise is taking. Youll also need to decide if the goal is fuse saving or fuse clearing in order to pick settings and curves for the fast and slow curves. The curve drawn between speed and time is called the speedtimecurve. Special features of traction motor, methods of electric brakingplugging rheostatic braking and regenerative braking. The typical speed time curve for a locomotive is shown in figure given above.
But this last offered a further expansion until which one we know today. If you need this ebook you can download it free from here. Review of existing electric traction systems in india. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. There are various system of electric traction existing such as electric train, trolley buses, dieselelectric vehicles and gas turbine electric vehicles. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. Modern heat extraction systems for electrical machines a. Railway electrification as a means of traction emerged at the end of the nineteenth century, although experiments in electric rail have been traced back to the midnineteenth century. Download uee notes pdf 6 unit vii electric traction ii. B ecause of the curves in the track the contact wire. Intelligent traction control in electric vehicles using a novel acoustic approach for online estimation of roadtire friction. Electric traction system requirements, terms, advantages. Poor power quality affects the performance, reliability of the railway system as well as having an effect on equipment attached to the local distribution network.
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