Voltage Levels

Why all voltage level are multiples of 11, like 220V, 440V, 1100V instead of 200V, 400V, 1000V?

dhands
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Jun 6th, 2010
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dhrumil041189
Profile Answers by dhrumil041189

Jun 11th, 2010

Because number of disc of insulators are rated in order of 11 kV so all these are transmitted in the multiple of 11.

pradipsabar2009
Profile Answers by pradipsabar2009

Jul 30th, 2010

The value of form factor is 1.1 which is calculated for the sine wave. At this value of form factor, leakage flux is minimum and efficiency is maximum for any electrical machines. These machines are operated at sine waves.