Paul,
that was a rather different take on it! What did they call the 400kV lines? Ultra Super Extra High Voltage? [Linked Image]

Bjarney,
I better brush up on my math: 830/sqrt(3) isn't 500... [Linked Image] Interesting part about the delta-wye rewind. 1040/600V makes sense if you use rewound 600V motors.

The cables shouldn't be a problem, most metric underground cables are designed for 600/1000V but
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don’t forget the switching and protection aspects—starters and fuses/circuit breakers have to be designed for the application.

Meaning they will charge you an arm and a leg for every single component. Only octopuses need bother ordering entire installations [Linked Image]