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15-06-2012, 01:29 PM
Post: #1
ELECTRIC TRACTION ppt
ELECTRIC TRACTION



.pptx  ELECTRIC TRACTION.pptx (Size: 1.5 MB / Downloads: 179)

What is a traction??



The act of drawing or pulling.
When the above act is done by electricity, then it is nothing but electric traction.
Electric traction also means a locomotive in which the propulsion (tractive or driving) is obtained by the use of electricity.


Electrification System:


Electrification systems are classified by three main parameters:

Voltage
Current
Contact system


Current


a)Direct current: The DC system is quite simple but it requires thick cables and short distances between feeder stations because high currents are required.

b)Alternating current: These are overhead electrification systems. Alternating current can be transformed to lower voltages inside the locomotive.


Contact System


a)Over head system: The supply of electricity is through an overhead system of suspended cables known as the catenaries.


b)Third rail system: A third rail is a method of providing electricity to power a railway through a continuous rigid conductor alongside the railway track or between the rails.
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