Utilisation of Electric Power and Electric Traction book. Read reviews from world's largest community for readers. Utilisation Of Electric Power & Electr. Utilization of Electric Power & Electric Traction by J. B. Gupta, , available at Book Depository with free delivery worldwide. B. Gupta, R. Manglik and R. Manglik - Download as PDF File .pdf), Text File .txt) or read online. Utilization of Title: Utilization of Electrical Energy and Traction.
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Utilization of Electrical Power - Ebook download as PDF File .pdf) or read book online. Book Name: Utilization of Electrical Power (include electrical traction and . This is very best book for utilisation of electrical energy, but i cant download thi book due to bed financial condition. can u please send me pdf of this book on my email please. All 10 reviews» ELECTRIC TRACTION energy saving by series parallel control, ac traction equipment. Utilization Of Electric Energy,E Openshaw Taylor, 12th Impression,,Universities Press. 2.
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Manooja rated it did not like it Apr 02, Shivaji rated it did not like it Oct 08, Pavan Naidu rated it it was amazing Jun 26, Rekha rated it it was amazing Jan 03, MD Ali rated it really liked it May 27, Sujeet Sinha rated it it was amazing Jan 18, Tabish rated it really liked it Dec 02, Satya Ketu rated it it was ok Dec 01, Aravind added it Mar 19, Vinay Saketh added it Apr 06, Aanya Singh marked it as to-read Apr 07, Sujithra marked it as to-read May 09, Rs Kumar is currently reading it May 12, Dean George marked it as to-read Jun 18, Vishesh Gupta marked it as to-read Sep 20, Wajid marked it as to-read Apr 07, Niharika Shashidhar marked it as to-read Jul 26, Suhas Gite marked it as to-read Aug 13, Lishina marked it as to-read Aug 31, Arnima marked it as to-read Dec 01, The motor naturally stops accelerating when the drag of the train matches the torque produced by the motors.
To continue accelerating the train, series resistors are switched out step by step, each step increasing the effective voltage and thus the current and torque for a little bit longer until the motor catches up. This can be heard and felt in older DC trains as a series of clunks under the floor, each accompanied by a jerk of acceleration as the torque suddenly increases in response to the new surge of current.
When no resistors are left in the circuit, full line voltage is applied directly to the motor.
The train's speed remains constant at the point where the torque of the motor, governed by the effective voltage, equals the drag - sometimes referred to as balancing speed. If the train starts to climb an incline, the speed reduces because drag is greater than torque and the reduction in speed causes the CEMF to fall and thus the effective voltage to rise - until the current through the motor produces enough torque to match the new drag.
The use of series resistance was wasteful because a lot of energy was lost as heat. To reduce these losses, electric locomotives and trains before the advent of power electronics were normally equipped for series-parallel control as well.
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Dynamic braking[ edit ] If the train starts to descend a grade, the speed increases because the reduced drag is less than the torque. With increased speed, the internally generated back-EMF voltage rises, reducing the torque until the torque again balances the drag.
Because the field current is reduced by the back-EMF in a series wound motor, there is no speed at which the back-EMF will exceed the supply voltage, and therefore a single series wound DC traction motor alone cannot provide dynamic or regenerative braking. There are, however various schemes applied to provide a retarding force using the traction motors.
The energy generated may be returned to the supply regenerative braking , or dissipated by on board resistors dynamic braking. Such a system can bring the load to a low speed, requiring relatively little friction braking to bring the load to a full stop.
Automatic acceleration[ edit ] On an electric train, the train driver originally had to control the cutting out of resistance manually, but by , automatic acceleration was being used.
This was achieved by an accelerating relay often called a "notching relay" in the motor circuit which monitored the fall of current as each step of resistance was cut out. All the driver had to do was select low, medium or full speed called "series", "parallel" and "shunt" from the way the motors were connected in the resistance circuit and the automatic equipment would do the rest.
Utilization of Electric Power and Electric Traction Books
Rating[ edit ] Electric locomotives usually have a continuous and a one-hour rating. The one-hour rating is the maximum power that the motors can continuously develop over a one-hour period without overheating the motors.
As traction motors use a reduction gear setup to transfer torque from the motor armature to the driven axle, the actual load placed on the motor varies with the gear ratio. Otherwise "identical" traction motors can have significantly different load rating.
A traction motor geared for freight use with a low gear ratio will safely produce higher torque at the wheels for a longer period at the same current level because the lower gears give the motor more mechanical advantage.
The motor armature has a maximum safe rotating speed at or below which the windings will stay safely in place. Above this maximum speed centrifugal force on the armature will cause the windings to be thrown outward.
Utilisation of Electric Power and Electric Traction
In severe cases, this can lead to "birdnesting" as the windings contact the motor housing and eventually break loose from the armature entirely and uncoil. Bird-nesting due to overspeed can occur either in operating traction motors of powered locomotives or in traction motors of dead-in-consist locomotives being transported within a train traveling too fast. Another cause is replacement of worn or damaged traction motors with units incorrectly geared for the application.Sujithra marked it as to-read May 09, To orient the subject matter in the proper direction, visits to industrial establishments are recommended in order to familiarize the students with the new developments in different areas.
The one-hour rating is the maximum power that the motors can continuously develop over a one-hour period without overheating the motors. Goodreads helps you keep track of books you want to read.
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