There was a UK incident in the early nineties where the helicopter was patrolling the LV wires (visual inspection rather than camera so they were in pretty close) and struck an HV pylon-line from underneath where it crossed over the LV wires.
WSPS not fitted but unlikely to have made a difference in that case - low speed & big wire plus the point of impact was such that WSPS would have missed it anyway IIRC (which perhaps i don't).
All three occupants survived without serious injury thanks largely to four-point harnesses, helmets and luck!
OH