Direct Coupling Lightning Strikes - Illustration
Direct Coupling Lightning Strikes
In the event of a direct lightning strike say, to a power pylon, part of the discharge current will be conducted to earth, through the pylon, the remainder will be propagated along the cables, in either direction.In this case, for simplicity, we can assume a third in each direction.
This in reality will be subject to the resistance path to earth. We can see that the sensitive equipment is vulnerable.