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Answer Posted / rajbharath
The reason is that this is in the optimum range for power
supply on a national scale. The use of lower frequencies
would cause the size, weight and cost of the installed
equipment to increase and the flicker of lights to become
noticeable (as it was on early 25Hz systems). The use of
higher frequencies would cause increase in the operational
losses due to eddy currents, hysteresis, skin effect,
radiation etc. and reactive voltage drops.
In physically smaller power systems such as those on planes,
ships, submarines and even railways, higher frequencies are
used because they allow reduction in the power equipment
size and weight - i.e. the optimization is different.
50 Hz however, is not universal. Many countries use 60 Hz
which is close to the same optimum as 50. 60 Hz users mainly
are: almost all the Americas and some countries in Asia.
Korea even uses both frequencies! 50 Hz prevails in Europe
and ex-British colonies.
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