a special-purpose transformer used in contact systems
. In order to increase the shielding effect, the primary winding of a negative booster transformer is connected in series with the contact system, while the transformer’s secondary winding is connected in series with the rails. …
What is negative booster?
A booster used
to lower the potential of a point on an earthed return path to below earth potential
.
What is the function of negative booster?
Provision of a negative booster is essential in the case of electric traction. By avoiding the flow of return currents through earth, it
curtails corrosion of underground pipe work and interference with telegraph and telephone circuits
.
What is the supply frequency for electric traction?
20100 Supply System
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 traction system is best?
In case of heavy trains that require frequent and rapid accelerations,
DC traction motors
are better choice as compared AC motors. DC train consumes less energy compared to AC unit for operating same service conditions.
What is Kando system?
Single phase to three phase system
This
traction system
is also called Kando system. It consists of single phase16KV, 50 Hz supply which is fed from the substation and is being carried through a single overhead conductor. … The three phase supply is then fed to induction motors to drive the locomotive.
What are the disadvantages of electric traction?
- Requires high capital cost.
- Less flexibility of the routes.
- Can cause interference with nearby communication lines.
Which locomotive has the highest operational availability?
Answer:
Electric Locomotive:-
An electric locomotive requires much less time for maintenance and repairs than a steam locomotive and such vehicles can, if desired, be kept in service for 95% or more. Diesel Locomotive:- It is available for hauling for about 90% of its working days.
Why is 25kV used in electric traction?
The main reason for 25kV voltage used in railway is, that
25 kV AC more economical than 1.5kV DC voltage system
. Since 25kV voltage system has higher voltage, the higher voltage reduces the current flow through conductor; this reflects to reduce the conductor size. The cost of the conductor gets less.
What is difference between electric and non electric traction system?
A traction system that doesn’t use electrical energy for the movement of vehicle at any stage
is referred as non-electric traction system. The steam engine drive is the best example of a non electric traction system and it is the first locomotive system used before the invention of actual electric traction systems.
Which motor is used in traction system?
AC traction motors have replaced DC motors in many traction applications. 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.
What are the four 4 main parts of the traction power system?
Main components of electrical traction systems:
electric power sources, traction power substations and tractive engines
. Type of the contact line systems: non-compensated, semi-compensated and compensated. Mathematical model of the train movement: regime of traction vehicle drives. Tractive effort.
Which motor is used in tramway?
Dc motor (Ma) and induction motor (Mc)
are currently manufactured and used in 105 N tram drive, their parameters are available. Dc motor (Mb), brushless motor (Me) and slip-ring motor (Md) pa- rameters have been determined by analysis.
Which Indian city adopted electric traction first?
The first electric train ran in India with the inauguration of services between
Bombay VT
and Kurla Harbour on 3rd Feb 1925 on ex-GIP Railway system.
How much voltage does a train have?
Indian railway traction system uses
1.5 kV DC around Bombay
and 25Kv ac is used in rest of the country. The supply for traction system is taken from state utility which is three phase source at 132/220 kV.
What are the requirements of electric drive for traction?
The traction drive required
large torque during start and acceleration to accelerate the heavy mass
. Because of economic reason single phase supply is used in AC traction. The supply has sharp voltage fluctuations, including discontinuity when the locomotive crosses from one supply section to another.
