What is the reason behind 11kv 33kv 132kv.....means
multiple of 11?

Answer Posted / ajit g. k.

We use sine wave in our electrical system. The form factor
of sine wave is 1.11 . For efficient transmission, we have
to maintain the generation and transmission voltage as a
multiple of 1.11 . This is the reason we use 11kV, 33kV.
The generation voltage is 11kV in India.

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