What are the advantages of 25 kV?

A 25 kV AC traction system has several advantages compared to other traction systems, such as: Reduced power loss: The higher voltage reduces the power loss during transmission, which means that more power can be delivered to the locomotive or train.



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Advantages of 25 kV AC System over DC System The 25 kV AC substations have lesser number equipment. The 25 kV AC system requires light overhead catenary (conductor) than the DC system. The use of high voltage (25 kV) in the overhead system reduces the current in the line which makes the use of small sized conductors.

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In 25 kV AC system, the current drawn is less so the voltage drops which are mainly due to reactance of line are also quite less. Thus, there is great saving in the substations, i.e. in the 25 kV AC system, the longer distances between two sub-stations can be provided.

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For mainline and high-speed railways 25kV ac is now the most proven and widely used system. It offers a number of advantages, including reducing the cost of power supply equipment, improving efficiency, and using energy from braking more effectively which are all potentially attractive features to metro operators.

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Most overhead railway cables carry a voltage of 25,000 volts (25kV) in order to power electric trains. This is roughly 100 times more powerful than the electricity used in your home.

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The choice of 25 kV was related to the efficiency of power transmission as a function of voltage and cost, not based on a neat and tidy ratio of the supply voltage. For a given power level, a higher voltage allows for a lower current and usually better efficiency at the greater cost for high-voltage equipment.

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Railway electrification in Great Britain began in the late 19th century. A range of voltages has been used, employing both overhead lines and conductor rails. The two most common systems are 25 kV AC using overhead lines, and the 750 V DC third rail system used in Southeast England and on Merseyrail.

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Alternating current is easier to generate and transmitting alternating current leads to lower energy losses than direct current over distances more than a few metres. Although for very long distances (more than 1000 km), direct current can often be better.

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The train uses a distributed drive concept with 32 driving axles, 4 traction transformers, 6 traction converters and is also prepared for three different voltage levels: 25 kV AC, 1500V DC and 3000V DC.

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Power plant capacity is far greater than any individual locomotive uses, so electric locomotives can have a higher power output than diesel locomotives and they can produce even higher short-term surge power for fast acceleration. Electric locomotives are ideal for commuter rail service with frequent stops.

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Freight rail operators told us that longer trains increase efficiency and decrease costs.

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