Why electricity is being transmitted in multiple of 11 ?
There is no real standard around the world and many countries use different voltage levels for their purpose.
I found one statement from a standard electrical text book
[So that the answer is quite simple in that when one designs motor and transformer and even instrumentation, one finds that such equipment respond to the average value of voltage, current and flux. As such transformers are normally designed to have an integer value for voltage/turn OR Ampere-turn.
In such cases the average value will be 10,30,60_ _ _ _ Kv and if one multiplies by 1.11 which is the form factor for a sinusoidal wave one will get 11,33,66 Kv etc. Generally the number after the first two digits are just ignored]
The above answer is not correct why because
Right Answer is
When we want to maintain 10Kv at receiving end, transmission companies transfer 10% extra then receiving end voltage. i.e. 11kv, similarly 10% 20,30,60,120. i.e. 33kv, 66kv, 132kv
Now a day we are using 400v instead of 440v , 230v instead of 220v
also alternators also available which can generate voltage level in the range of 10.5kv to 15.5kv so generation in multiple of 11 does not arise.
Why transmission line 11kv or 33kv 66kv
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