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The max. i heard about is (600KV)
If I understood right, the question refers to the record AC voltage transmission line, and it should be the1. MV (Ultra High Voltage =1, kV) on Ekibastuz-Kokshetau line (Kazakhstan)
kv transmission lines are generally used worldwide
Are you looking for a figure likeKV ?
kV in most countries. but in some countrieskV andkV as well
I think you can consider about1MV in China, up tokV in Canada.
Basically, real criteria is the distance through the energy is transmitted. This is why AC voltage in Europe is not so high.
it's Kilovolt and can be up to KV