I have been fascinated by the discussion of HV DC lines and would be 

grateful if the following questions could be answered.

I beg the indulgence of the moderator for this off-topic topic.

1  How is the HV DC contrived.  Generated HV or rectified?

2  Once it reaches the other end, how it is turned back into AC?

   Motor-generators,  really big inverters?

3  What are typical voltage ranges and distances travel led?

4  Do the lines rely on the earth for "return" or do they run + and - ?

73,

Tim Colbert  K3HX 


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