Why do we use multiples of 11 as voltage in transmission lines?

[frankdawnz]

Why do we use multiples of11 as voltage in transmission lines

[rammohan.gubba]

Hi,
Its simple...
Transformer comes into picture when you talk about transmission.

Transfomer Induced voltage equation contains 4.44 factor.

E=4.44*f*T*phi
E -Induced emf per phase
T -number of turns
f -frequency
phi -maximum flux per pole

From the equation we see that E is proportional to 4.4 and it is in turn multiple of 11.
So always transmission voltage is multiple of 11.

[sauravgoswami]

might be so,but we can also transmit voltage in other multiples too

[cutiermn]

then how others countries are having some other volages like 1050........ there where transformer come into picture

[cutiermn]

if transformer is a one means, then how other countries are having other voltage like 500kv , 1050 kv...........


and also it may not be due to transformer output equation ok....... transformer eequation also derived from form factor (1.11)........ it should not because of transformer.

[cutiermn]

y our porcelain insulator discs are designed for 11 kv

[prestonee]

Considering there have been what 3 different posts asking the exact same thing within a couple of days I'm starting to think the Indian students use this forum as a means of having Engineers do their homework for them...

[anupi87]

hey actually its not mutiple of 11. its the multiple of 1.1
u may be knowing that its form factor.
we use multiples of form factor