in trafo we have seen that rating is generally 220/34.5 KV, 33/6.9KV and 6.6/0.433KV.
34.5,6.9kv etc are no load voltage we know.
now my question is what basis 34.5KV comes from 33kv. same for 6.9kv from 6.6kv and 433v from 415v. plz reply.
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