Which type of power supply is used in electric traction?
The single phase 50 Hz power for the electric traction is obtained from 220/132/110/66 kV Extra High Voltage 3-phase grid system through step down single phase transformers.
Which motor is used for electric traction system?
The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils. Motors for a typical locomotive would be in the range 400 to 600 kW.
What is traction power supply?
A traction network or traction power network is an electricity grid for the supply of electrified rail networks. Alternatively, the three-phase alternating current of the power grid can be converted in substations by rotary transformers or static inverters into the voltage and type of current required by the trains.
How do electric trains get power?
An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor. Additional efficiency can be gained from regenerative braking, which allows kinetic energy to be recovered during braking to put power back on the line.
Do trains run on AC or DC?
DC motors are used on trains is because of their high torque and good speed control. Compared to AC motors, DC motors can provide industry applications with a fine balance of strong starting torque and controllable speed for seamless yet precise performance.
Why is electric traction preferred?
Electric traction involves the use of electricity at some stage or all the stages of locomotive movement. It has many advantages over non-electric traction systems such as more clean and easy to handle, no need of coal and water, easy speed control, high efficiency, low maintenance and running costs, etc.
What are the advantages and disadvantages of electric traction system?
This is non-electric drive mostly used for road transport. Main advantages of the drive are low investment and flexibility of the routs and have the disadvantages of low overload capacity, uneconomical operation, high maintenance cost and short life.
What is traction power used for?
In the DC railway traction power supply network, a traction power substation (TPSS) is used to power trains. Some modern DC railway systems implement both rectifiers and inverters in the TPSS.
Do electric trains have engines?
Instead of a tank of diesel and an engine, the train has a tank of hydrogen and a fuel cell that combines the hydrogen with oxygen from the air, without combustion. With the only emission being water, the fuel cells provide power and have zero emissions.
Do trains run on DC?
However, DC diesel-electric trains are still very popular as they are relatively cheaper to manufacture. Today, they can be found in many parts of the world and run as both freight and passenger services.
Which is more preferable AC or DC?
Answer: Ac is more preferred than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transimission. When fault occurs it is easy to interrupt ac supply.
What are the disadvantages of electric traction system?
6. Disadvantages of Electric Traction (i) High initial expenditure (ii) Failure of supply is a problem (iii) Electrically operated vehicles have to move only on electrified track (iv) For braking & control, additional equipments required (v) Interference with telegraphs and telephone lines.
