Railway electric traction supply systems| AC electric traction| DC electric traction| Direct current
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- Опубликовано: 8 мар 2021
- Electric railways are a non-polluting energy efficient mode of transport for freight as well as people. Traction power for electric trains can be Direct Current (DC), Alternating Current (AC) or even a composite system employing both AC as well as DC.
A DC electrification system has several advantages. It allows rapid acceleration and braking of DC electric motors, DC systems cost less compared to AC systems. There is less energy consumption and they take less space and have lower weight. Importantly, a DC system does not cause electrical interference with nearby communication lines. However, DC voltage decreases with increasing length and therefore necessitating Expensive substations at frequent intervals typically 2-4 km. The overhead wire or third rail must be relatively large and heavy.
AC Traction has several advantages which have relegated DC traction to the side-lines. The AC power can be easily stepped up or down. It allows easy controlling of AC motors and the interval between substations is larger being between 15-20 Km. Moreover, it can use lighter catenaries and low currents can be transmitted at high voltages. Reduced capital costs of electrification. Like DC, AC traction also has some drawbacks such as increased costs of maintenance of lines and need for increased clearances in tunnels due to the overhead wires.
Composite System (or multi-system) trains are used to provide continuous journeys along routes that are electrified using more than one system. 
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One of the most marvelous and rare RUclips channel about trains
Thanks mate 😊
Seriously very underrated channel, loved the technical part so well explained. Please sir keep adding videos, 🙏🙏🙏
Thank you for the kind words
With a personal interest in both the Czech Republic and Slovakia and - to a lesser extent - France, where the rail network is, in all three cases, a mixture of higher-voltage AC and lower-voltage DC the various different 'plus' and 'minus' points about the two systems are of very great interest, so thank you for explaining it all so clearly.
I do quite a lot of tracing rail journeys on RUclips in those three countries and it is always quite a challenge to detect whether one is under AC or DC catenary by how heavy the overhead wire looks and how often one sees a transformer station beside the railway...although there is invariably some text that takes that guesswork away!
Thank you Chris…
@@TheTrainStory You're welcome!
Electric railways are not necessarily non-polluting if the power plant producing the electricity they use is produced at the power plant by coal, natural gas, or nuclear power. The only way that electric railways can be non-polluting is if the electricity needed to power them is produced by wind, solar, or tidal means. Any other way just shifts the pollution from the individual engine to the power plant that supplies the power.
Unfortunately Yes…
Multi-system locomotives or EMUs are probably the best solution in the long run when there are multiple systems in use, making expanding the routes and redirecting rolling stock from one route to another much easier.
Yes particularly for multi-country routes
Here in Los Angeles we use 750DC. Love my job as a Traction Power Inspector.
Nice explained DC & AC Electric ELECTRIC Locos 👌🔥
Thank you for clearing my doubt on 3 phase motors
My home state N.Calif SF/Bay Area has a heavy rail transit system BART serving four counties some 120 + miles of track. The trains are powered via 3rd rail 1Kv DC each station stop or close by has a power substation with DC power houses. The original traction motors were DC, 500V wired in series each car had four motors. In the late 1990's a changeover was made to 3 phase traction motors along with a 3 phase inverter.
Very informative.pl compare AC and DC Traction motors in terms of speed control,starting torque, coling requirements and maintenance like brushes etc
Again thanks for a detailed presentation in subtle language, eagerly waiting for another such, this time preferably on evolution of signalling system in Indian railways
Thanks for appreciating. I have discussed signaling here (ruclips.net/video/hL-Wwfrxzzc/видео.html and ruclips.net/video/uyHqIxVz1vs/видео.html).
Excellent explanation with good video footage. I would think the multiple voltages propulsion systems design and maintenance keep the electrical engineers at full employment.
Your channel is really awesome bro. My love for trains rekindled when I played the game Transport Fever 2.
Thanks friend 😊
I have a question and didnt get answer for it after watching this video, single phase 25kV line used here and neutral is grounded through wheel and railway track, now my question is what ever is the amount of current flowing from 25KV phase goes to neutral (ground), how the circuit is completed here, and what about the losses when the neutral is grounded? Please answer
Nice video, thanks. Key DC / AC differences hard to find somewhere else. Helped a lot :)
What an explanation sir....... marvelous..... We need detailed videos for evry Indian loco.
Thank you friend 😊
Very good. Thanks 🙏🙏🙏🙏🙏
Awesome videos with animations and explanations 😊
Thank you
Very informative video.
Dc system is rigid but the motor are head ache and we can't accurately control dc motor speed, while ac motor speed can controlled very accurately using vvvfd but due to Indian quality of manufacturing these days the convertor and controller fail often ( especially the medha ones)
Thanks man for the technical detail/update ...
Explained very well
Thank you
Nice and informative videos hope ur channel grows more, appreciate ur efforts🙏🏼🙏🏼
Thank you 😊
Thanks for clearing my doubt sir!
Superb animation!!!
Happy to know 😊
Nice information
Question: Why do I see some diesel locomotive/multiple units also having AC/DC traction motors? Are they different from electric locos/EMUs?
Those are diesel-electric locomotives/multiple units. A Diesel engine drives an alternator that powers the traction motors. The difference is, a diesel-electric loco carries its power supply onboard while an electric locomotive draws power from overhead or third rail catenary.
MOST OF EUROPE USE 15kV 16 2/3 Hz AC when it's near DC. To increase speed the had a transformer with many windings a fed the DC motor WITH NEAR DC CURRENT in the locomotive. Today use of ASYNCRON MOTORS AND USE THREE PHASE TYRISTOR REGULATED AC TO INCREASE OR DECREASE SPEED!
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Great information bro😊
Thanks friend...
I'm a residential electrician, and I'm just trying to understand what my local light-rail system uses as the return path as we only have one cantonary wire and no charged rail... so what gives, how is the circuit completed?
Do you have video on EMU / MEMU electric traction?
please make a video explaining the route interlocking system
How DC Current is Grounded ? In Tracks
How did you do animation can you please tell me which type of software you are using for making this train
I generally use a combination of photoshop and premiere
Can you please tell.me.which is the background music track ? Its nostalgic ❤️
Divine Life Society from RUclips audio library
I am from Russia,I would like to work in your country!
Can you do a video on the Indian Railways 4-6-2 Pacific WP Class?
I have plans ... but it will be a while because I don’t have enough video footage of the WP Class
@@TheTrainStory ok
What happen if DJ not tripped while negotiating NEUTRAL SECTION.
AC has too many disadvantages; it doesn't work well in hilly areas and tunnels; more electricity is wasted and there seem to be too many problems in bad weather. DC third/4th rail seems to be the better alternative...
PLAESE MAKE VIDEO IN HINDI
Can you provide pdf of this content
Can we get this ppt?
Mmmm😊
Story on wap 5
😘😉
The music is so loud I cannot hear what you're saying. Lowered volume to zero and turned on captions. Problem solved. Otherwise, very good video.
My apologies for the inconvenience…
👍 why dc locos won't cross cr zone bro
DC locomotives are now extinct in India. Earlier the Mumbai region was the only area with DC (1500 V) supply, therefore DC locos were restricted to Mumbai only.
@@TheTrainStory but those wcam will support both ac and dc know bro so they can run other States or zones no
Because of absence of sheds. Presently all WCAMS are homed in Kalyan shed (I am not sure about Valsad). Therefore the locomotives are rostered within the serviceability range of Kalyan shed. Although technically, the WCAMs can run on all electrified sections of IR.
@@TheTrainStory kk
Why do people use DC instead of AC on railway then if you say AC is better?
The whole IR must be privatized
music was not necessary