Which type of power supply is used in electric traction?
Power supply systems for electrical traction: direct voltages 600 V, 1500 V, 3000 V, alternating voltage 15 kV with frequency 16 2/3 Hz), alternating voltages 25 kV and 2x 25 kV with frequency 50 Hz.
What is traction power supply?
A traction substation, traction current converter plant or traction power substation (TPSS) is an electrical substation that converts electric power from the form provided by the electrical power industry for public utility service to an appropriate voltage, current type and frequency to supply railways, trams ( …
How does traction power work?
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.
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.
What is the difference between AC and DC locomotives?
AC traction for locomotives is a major improvement over the old DC systems. The primary advantages of AC traction are adhesion levels up to 100% greater than DC and much higher reliability and reduced maintenance requirements of AC traction motors. 45 for old DC units to about . 90 for modern AC units.
What type of DC motor is used in traction system?
4.6
| Motor | Application |
|---|---|
| DC series motor | Traction system, Cranes, air compressors |
| DC shunt motor | Lathe Machines, Centrifugal Pumps, Blowers, Conveyors, Weaving Machine, Spinning machines |
| DC compounded motor | Presses, Shears, Elevators, Rolling Mills |
| Stepper motor | 3D printing equipment, Small robotics, CNC milling machines |
What is traction power cable?
The transit industry uses insulated cable for traction power supply and negative return cables between traction power substations, tie switches, and points of delivery to the vehicles, whether third (contact) rail or overhead contact system (OCS).
What is a traction power engineer?
A traction power engineer typically works in the transit and rail industry and is responsible for developing design/concepts to clients and project team members.
How much is 25kv?
The answer is 25000 volts.
What is 2 25 kV traction system?
2×25 kV traction system means transmission at 50 kV and using at 25 kV voltage system. 50 kV transmission benefits for. Improved voltage regulation and reduced transmission line losses. Increased Traction Substation spacing. Improved Load factor as number of trains fed per feeding post are more.
What type of motors are used in locomotives?
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.
What voltage do locomotives use?
DC locomotives typically run at relatively low voltage (600 to 3,000 volts); the equipment is therefore relatively massive because the currents involved are large in order to transmit sufficient power. Power must be supplied at frequent intervals as the high currents result in large transmission system losses.
What is electric traction system PPT?
The Electric Traction System PPT briefly discusses the Types, supply system, traction motors, braking system, advantages and disadvantages and recent trends. A traction system causes the propulsion of vehicle in which tractive or driving force is obtained from various devices such as diesel engine drives, steam engine drives, electric motors, etc.
What are the advantages of DC traction system over AC traction?
The equipment in DC traction system is less costly, lighter and more efficient than AC traction system. It causes no electrical interference with nearby communication lines. Expensive substations are required at frequent intervals. The overhead wire or third rail must be relatively large and heavy.
What is track electrification and how is it done?
The track electrification refers to the type of source supply system that is used while powering the electric locomotive systems. Selecting the type of electrification depends on several factors like availability of supply, type of an application area, or on the services like urban, suburban and mainline services, etc.
What are the supply systems of AC electrification?
The supply systems of AC electrification include single, three phase, and composite systems. The Single phase systems consist of 11 to 15 KV supply at 16.7Hz, and 25Hz to facilitate variable speed to AC commutation motors. It uses the step-down transformer and frequency converters to convert from the high voltages and fixed industrial frequency.