What is the operating voltage for DC traction?
Standardized traction voltages are 750 V DC, 1500 V DC and 3000 V DC. The three-phase voltage from the local utility is stepped down and rectified in the traction substations to provide the required DC voltage.
What is a DC switchgear?
DC switchgear. DC switchgear is designed to protect the DC powered railway line and integrated with high speed circuit breakers for the rectifier, the power feeder, and the backup application to prevent safety incidents.
What is high voltage traction?
The high-voltage inverter converts direct current (DC) from the batteries or generator to alternating current (AC) to power the traction drive motors.
What is DC traction power supply?
The urban rail DC traction power supply system can transmit electric energy from the traction substation to the electric train through the feeder line and the contact rail. Afterwards, the electric train flows back to the traction substation through the track return line.
Which motor is usually used in DC system of traction?
Traditionally, these were series-wound brushed DC motors, usually running on approximately 600 volts. The availability of high-powered semiconductors (thyristors and the IGBT) has now made practical the use of much simpler, higher-reliability AC induction motors known as asynchronous traction motors.
How many types of switchgear are there?
The three categories are: High Voltage (H.V.) Switchgear. Medium Voltage (MV) Switchgear.
What is the difference between a switchboard and switchgear?
The main difference between switchgear and a switchboard lies with the voltage each is designed to handle. Switchgear are designed for high voltages (up to 350 kV) whereas switchboards are designed for voltages below 600V.
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 used for?
Traction current lines are used to power the railway systems of countries which use alternating current of a lower frequency than the public supply. This is typically the case in the German-speaking countries of Europe. For example, 16.7 Hz AC is used in Germany, Austria and Switzerland.
Which motor is most suitable for traction?
Many single phase ac motors have been developed for traction purposes but only compensated series type commutator motor is found to be best suited for traction. Single phase induction motors have been abandoned as they are not capable of developing high starting torque.
What type of DC motor is most suited for traction and why?
DC series motor has develops high torque at low speeds, low torque at high speed, this is the basic requirement of traction unit. Commutating property of series motor is good so we get sparkles commutation. Torque is unaffected by variation in supply voltage. DC Series motor maintenance cost is less.
What are the four main parts of the traction power system?
Main components of electrical traction systems: traction power substations, contact line systems, railway network section switchgear.
Which DC motor is used for traction?
What is high voltage switchgear used for?
High voltage switchgear is any switchgear used to connect or disconnect a part of a high-voltage power system. This equipment is essential for the protection and safe operation, without interruption, of a high voltage power system, and is important because it is directly linked to the quality of the electricity supply.
What is the standard voltage of traction power?
Standardized traction voltages are 750 V DC, 1500 V DC and 3000 V DC. The three-phase voltage from the local utility is stepped down and rectified in the traction substations to provide the required DC voltage.
Why choose Sécheron for DC switchgear and distribution boards?
Turn to us for DC switchgear and distribution boards built on the latest technology and certified to the latest standards. Sécheron leverages a comprehensive range of products and solutions for DC traction power substations to meet your DC traction network electrification needs.
What type of switchgear do you use on light rail?
DC Switchgear. Powell DC Switchgear is most commonly utilized on light rail and transit applications. We use the Hawker-Siddeley NDC circuit breaker in a switchgear assembly designed, built and tested by Powell.
What is a switch-disconnector N…DC?
Switch-disconnectors N…DC in the special version for up to 1500 V DC can be used on 1 or 2-poles. They comply with the isolation properties even for earthed IT networks. Accessories, such as Bridge kits, connection terminals and door coupling rotary handles, enable individual installation in the most varied of distribution systems.