Why do trains use 25KV?

As you know 25kV is globally accepted voltage level for electric locomotives. Reasons to choose 25 KV instead of 240/415V is that for less voltage like 240V or 415V, flowing current increase to dangerously high value and counductor/Line could be burnt out.



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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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For mainline and high-speed railways with long distances between power supply substations, overhead line electrification is often the preferred choice. The ability to transmit high-voltage power efficiently and support longer trains makes it a suitable option for these applications.

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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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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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DC will consume less energy when operating under service conditions. The equipment in the system will cost less to build and there is no need to produce the conversion technology to ensure that the train can run on AC power.

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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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Practical levels of voltage are often referred to as medium voltage, meaning the incoming voltage to the transformer is on the order of 5 kV to 35 kV. Some distribution voltages may exceed 35 kV and would be considered high voltage, but most of the distribution system is within the medium-voltage range.

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1. Switzerland. Tucked inside the small but incredibly beautiful country of Switzerland is one of the most efficient and scenic rail networks in the world.

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