What is the most common type of high voltage cables?
I suspect ABB would be the best resource for HV and UV cable specs.

HDCV transmission cables

"http://www05.abb.com/global/scot/scot221.nsf/veritydisplay/96a764dfe7dc7de6c1256fda003b4d2d/$file/HVDC%20Cable%20Transmission.pdf"

Analysis
"http://www.icrepq.com/icrepq'11/239-ortjohan.pdf" 

beware there are many issues besides this on interface to the German Transmission grid. HVDC is best eventually. That's what we use in Manitoba and Quebec for over 40yrs. (Canada)