Comment by jacquesm 3 hours ago They simply weren't possible. HVDC relies on semiconductors that are relatively new. 1 comment jacquesm Reply leonidasrup 3 hours ago HVDC is older then semiconductors, but HVDC systems using solid-state devices are much more practical.https://en.wikipedia.org/wiki/High-voltage_direct_current
leonidasrup 3 hours ago HVDC is older then semiconductors, but HVDC systems using solid-state devices are much more practical.https://en.wikipedia.org/wiki/High-voltage_direct_current
HVDC is older then semiconductors, but HVDC systems using solid-state devices are much more practical.
https://en.wikipedia.org/wiki/High-voltage_direct_current