why the voltage transmission is always in a multiple of 11?
e.g. 110 V, 220 V, 33 kVA, 11 kVA
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Answer Posted / anirban dasgupta
The real reason is not form factor. Because now 400kv, 765kv, 1200kv(yet to be commissioned) are transmitted.
The real reason is actually due to a misnomer that started in the olden days. According to them, some voltage was always lost and they accounted it to be 10% of the transmitted voltage. So they always transmitted voltages 10% above what they required. For example if they wanted to transmit 100kv, they used to transmit 110kv, similarly 200kv - 220kv; 10% higher than what is actually required. That is why this multiple of 11 was there.
But now a days with advance protection schemes, people are transmitting voltages of the order 400kv, 765kv etc
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