What are the advantages of 25 KV 50 Hz AC system?

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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The construction of AC transmission lines is more complicated than the DC transmission lines. AC transmission lines require more conductor material than the DC transmission lines as three wire are required for AC transmission. The effective resistance of the AC transmission line is higher than DC transmission line.

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