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500Mw at 11kv works out to 45000 a

a bit big for any wire manufactured on this planet

suggest you go to a more practical voltage like 132,000V

Answer

Since we are inevitably talking about a three-phase transformer, the line current is determined from

IL= rated apparent power / (1.732 x UL) = (500 x 106) / 1.732 x 11 x 103)

...which works out at 26 244 A which, as the original answer suggests, is not a practical value for this combination.

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