Answer / nagesh.patwari

See all, It is cheaper to generate at a relative lower voltage and then step it up for transmission. Hence, most power generating plants are designed to operate at 11KV. Also generating voltages are designed in multiples of 1.11 or less considering the 10% or less voltage drop in the transmission lines & distribution lines.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%.

Answer / andy

I see many here ridiculously answer form factor, T/F
equation, etc.... Are u nuts.... Only in India and few other
countries have multiples of 11... Almost all other countries
have only 110V.... Other than 110V they have 25KV, 50KV
systems....

In Neyveli, There is 230Kv switchyard.

So in other countries do they use T/F with different Form
factors or what... It has something to do with internal
factors... Depends on probably Insulators as their value
varies depending on Temperatures which is unique for
different countries... In India Porcelain is Predominantly
used earlier so we use multiples of 11...

Answer / divyanshu yadav

its really jst a misconception that generated voltage has to do anythng with form factor...
this is just a hypothesis made by our old generations......
as raman said above that nowadays we are using 230v and even 765kv which is not a multiple of 11...

Answer / bhat rouf

because ,insulation,losses has the matter it,.

Answer / bhavnath trivedi

it is also 22 kv it depends on form factor but its not only the reason due to which its been choosen. theres are technical problem situated with it as we increase the generating voltage we have to increase the sige of turbines and also passive element used in it. it is 110 kv in usa and 220 kv in europe.
its not true that in every station its been generated at 11 kv
it is 13 kv in orba ntpc then it is converted to 11 kv.

Answer / tunak kr. sil

Many says that it is the form factor only which is
responsible for such rating,for sinusoidal wave is 1.11.
But now-a-days, this system is not following because IEC
has revised its system.So we use 400 kV and not 440 kV ,
even we are going for 765kV.

Answer / m.s.v.

We always use a multiple of 1.11 bcoz for a pure sine
wave the FORM FACTOR is the ratio of rms value of voltage
or current with the avg. value of voltage or current and for pure sine wave rms value of current is Imax/root '2' and avg. value is 2Imax/pie. and which comes out to be 1.11 so,we cant have a combination of other then a multiple of 1.11.

Answer / yogesh

As the generating voltage increases the efficiency of
alternator gets improve.this does not mean that we can go on
and on for much higher voltage because under that condition
the cost on insulation and cooling will increase and exceeds
the savings made by improving efficiency.
We have to arrive at a limiting value of generation i.e. 11kv.

Answer / nikhil s

if we transfer the generation from single phase to three
phase we can increase the generated power by 50% for the
same machine ,the value of voltage for achieving this 50%
increased power is 11kv rms
if my answer is wrong plz contact me ' nikhilgdas@gmail.com
'
b'coz i want to know more about this

Answer / ashli

what is the role of form factor in generated voltage, i
didnt get the idea.. will u plz explain clearly, what is
the problem in having some other generating voltage

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