On 28/07/2014 13:29, John Williamson wrote:
On 28/07/2014 08:23, harryagain wrote:


Where exactly is this arc drawn for 30 minutes and for what purpose.?


The arc *can* be drawn by using the DC charge stored in the cable. No
claim was made that it ever had been drawn either deliberately or
otherwise, though it's the kind of trick that installation engineers
have been known to pull as a joke, or that happens when things go wrong
when commissioning plant of this sort.


If you watch footage of repairs to 400 kV overhead lines (typically shot
from helicopters) you will see long and impressive arcs being drawn from
these for several seconds while they are brought down to earth potential.