why transmission line 11Kv OR 33KV,66Kv not in 10kv 20kv?

Answer Posted / ajay

I agree that ie. 11,33,66,132 kv are possible by form factor 1.11 bt in higher range ie 25 kv for railway, 220,400,765 kv. How we can get by using form factor????
Can anyone help me to clear my doubts please

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