Pankaj Katoch

 Profile Answers by Pankaj Katoch 

• Mar 19th, 2009

 

It depends upon the form factor. As the value of form factor is 1.11. So the transmitted voltage is in the multiple of 1.11. 

amboosa

 Profile Answers by amboosa 

• Mar 21st, 2009

 

The reason is some thing 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 220 V instead of 230 V.

haveasafeday

 Profile Answers by haveasafeday Questions by haveasafeday

• Mar 24th, 2009

 

No there is no technical reason. It may be the historical reason. But I've seen in a book that power generation start from England & they believe "11" number as a danger number (Example: David shepard, famouse cricket umpire, who jump on the ground when run is "11"). Thats why they use 11 in electricity to give it a danger sign.

Balaji

• Mar 1st, 2012

 

It is because the form factor of sine wave is 1.1 and the power is generated in sinusoidal wave shape because all magnetic circuits i,e transformers, motors exhibit favorable magnetization characteristics when sinusoidal waveform is used. The fun fact is only sinusoidal can be generated in a generator as includes a magnetic circuit in itself!
So all equipment ratings are in multiples of 11 so that conversion from peak to rms value would give a round number.

zakishan

 Profile Answers by zakishan 

• Mar 12th, 2012

 

I think that generation units are usually generates from 11kv to 30kv but usually used is of 11kv ,since transformers have real numbers for turns ratio between its primary and secondary ex. (1:2) so the transmitted voltage is multiple of 11 like 11,22,33,66,110,220 KV

Arun

• Mar 13th, 2012

 

We generate power at 11kv, and step it so on based on the ratio of t/f it will step up...............so we get 11to 33,11to132kv etc...

lijo

• Mar 27th, 2012

 

A:Transformer 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

veeru

• Mar 27th, 2012

 

The form factor of ac wave form is 1.1 so the voltage is multiple of this

NIMMALA RAKESH

• Mar 28th, 2012

 

The transmission voltages will be the multiples of 11 i.e. 11kv, 22kv, 33kv,etc., because from the transformer equation we have 4.44*f*n*phi where f is the frequency of ac input , n is the no. of turns and phi is the maximum flux per pole.... from the above equation it is clear that 4.44 is the multiple of 11 so the transmission voltages will be multiples of 11......