Answer Posted / sadam hussain gaad

The miss concept is Line voltage is in multiple of 11 due
to Form Factor. The form factor of an alternating current
waveform (signal) is the ratio of the RMS (Root Mean
Square) value to the average value (mathematical mean of
absolute values of all points on the waveform). In case of
a sinusoidal wave, the form factor is 1.11.

The Main reason is something historical. In olden days when
the electricity becomes popular, the people had a
misconception that in the transmission line there would be
a voltage loss of around 10%. So in order to get 100 at the
load point they started sending 110 from supply side. This
is the reason. It has nothing to do with form factor (1.11).

Nowadays that thought has changed and we are using 400 V
instead of 440 V, or 230 V instead of 220 V.

Also alternators are now available with terminal voltages
from 10.5 kV to 15.5 kV so generation in multiples of 11
does not arise. Now a days when, we have voltage
correction systems, power factor improving capacitors,
which can boost/correct voltage to desired level, we are
using the exact voltages like 400KV in spite of 444KV

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