What is the highest transmission AC voltage used worldwide?

The max. i heard about is (600KV)

kv in China, Russia . India is working on it.kv experimental in Canada.

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

the highest voltage is kilo volt

Kilo volt             .