How the speed of an electric locomotive is controlled?
Most DC motor circuits are arranged to control two or four motors. The control range is enhanced by changing the connections to the motors as the train accelerates. The system is known as “series-parallel control”. The diagram shows the resistors and contactors used to regulate the voltage across the motors.
How do you control the speed of a steam engine?
The speed of the engine is regulated by the “cut-off,” which consists of a plate of metal placed to fit and work on the back of the slide valve, which is furnished with certain openings through which the steam must pass into the cylinder while the cut-off plate is in a proper position.
What is the speed of locomotive?
Diesel locomotive engines are classified as diesel-mechanical (DM), diesel-electric (DE) and diesel-hydraulic (DH) engines. DM engines run at an average speed of 60 kmph, while DE engines travel at an average speed of 80 kmph, also the average speed of an electric engine.
How are pusher locomotives controlled?
In a push–pull train, locomotives at both ends of a train are used at the same time, being controlled by one driver. Using a single locomotive, a control car with duplicate controls is used when pushing.
What does running balls out mean?
1 often vulgar : all-out, full-out. 2 often vulgar : boldly aggressive or competitive.
How does a fly ball governor work?
The flyball governor is based on the idea of a feedback control loop. It works like this: Weighted balls are linked via hinged arms to the shaft of a steam engine. As the engine turns faster, the hinged flyballs fly apart. Less steam means the engine slows down and the flyballs come back together.
What is the fastest locomotive in the world?
The World’s Fastest High-speed Trains
- L0 Series Maglev: 374 mph.
- TGV POS: 357 mph.
- CRH380A Hexie: 302 mph.
- Shanghai Maglev: 268 mph.
- HEMU-430X: 262 mph.
- Fuxing Hao CR400AF/BF: 260 mph.
- Frecciarossa 1000: 245 mph.
How is the speed of a DC locomotive controlled?
Brakes In DC locomotives, the speed of DC traction motors is controlled by connecting all the traction motors in series during starting period and introducing starting resistances. These starting resistances are gradually cut out from the circuit and the voltage across the traction motors gradually increased.
How does the speed of an electric train work?
Due to absence of commutator, its peripheral speed puts no limit on speed of motor. AC traction motors can easily operate at 4000 RPM in contrast to DC motors which normally operate at speeds of 2400 RPM. The limit imposed due to bar to bar voltage for DC commutator is eliminated in induction motors.
What kind of power does an electric locomotive use?
An “Electric Locomotive” is a railway vehicle that can move along rails and push or pull a train attached to it using electric power drawn from an external source, usually from overhead cables or a third rail.
How does a DC traction system work on a locomotive?
More modern DC systems incorporate a wheel slip control which senses the beginning of a slip and automatically modulates the power in order to retain control. This allows the locomotive to operate safely at a point closer to its theoretical maximum.