Why you generate 11kv at generating station?

Answer 1

Power is generated at high voltages, such as 11 kilovolts, in most countries, not only in India.

The reason for this is that it is much more efficient to generate and distribute electrical power at such a high voltage than at lower voltages.

Another reason is something historical: in olden days when the electricity became popular, engineers had a misconception that there would be a voltage loss of around 10% in the transmission line. So, in order to get 10 kilovolts at the load point, they started sending 11 kilovolts 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 230 V instead of 220 V.

Please see the answer to the Related Question 'Why is electricity transported in high voltage but not in current?' shown below.

Answer 2

I know of several active generators that run at 6.6kV, and a few that run at 20-24kV, so what you state is simply not true. There is a wide range. Generally the larger the generator, the higher the output voltage. There are economic reasons for this. You may only be looking at generators made by the same manufacturer, or that are near the same size.

Answer 3

because the form factor is 1.11

Answer

Theoretically, you could generate any voltage at a power station but, in practise, that voltage is restricted due to the practical limit on how many conductors can be placed in the armature of the generator. So, in practise, the voltage is limited to around 30 kV. So voltages are not necessarily 11 kV; in the UK, for example, voltages are often generated at 25 kV.