Why the transmission level voltages are multiples of 11?

Hi this is manikandan an electrical engineer from chennai........ i am very glad to join in this forum. Let this be my first query

In india -
In the electrical power transmission-
why the transmission level voltages are multiples of 11


6.6kv, 11 kv,33kv, 66kv, 110kv, 220kv . If you find answer post me.

Pl find any technical reason beyond that....... are its traditional like our 50Hz story


  • Kaustubh Katdare
    Kaustubh Katdare
    Check here -

  • khyzer shamsi
    khyzer shamsi
    voltages will always b in the multiple of 1.1.
    those voltages which are not in the multiple of 1.1 are approximate.
    the exact theoretical voltage will always be a multiple of 1.1
  • aarthivg
    khyzer shamsi
    voltages will always b in the multiple of 1.1.
    Why it is so? Any particular reason for it.

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