Answer / soummyajit.jgec

because of form facter,it's value is 1.11..
that is why......

Answer / vijay yadav

form factor of ac is a multiple of 11
generation is in average value
while ratings are in rms
and rms value = form factor*avg value

so no matter generation is at which value
rms rating will always be a multiple of 11

Answer / s.t

don't know

Answer / suresh apgenco

For HV lines, insulators used are disc insulators whose each
rating is 11kv. based on the point only we are going to
transmit power in terms of 11kv i.e., 11kv, 22kv,... so on.
hence substation ratings are multiples of 11kv

Answer / shahbaz shaikh

because the step down transformer used having primary and
secound winding which is 11 no of coil or winding or it is
in the division of 11.

Answer / saravanan

the power generation is 11 kv..and using eqipments rating
is require low insulation

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