What are the consequences of an indirect lightning strike ?
Conduction:
The overvoltage phenomenon results from the direct contact of a conductor with lightning.
The overvoltage propagates along the conductor and, by extension, through the network.
An electrical or communication network cannot withstand the devastating energy of a lightning strike .
Induction:
The overvoltage phenomenon originates from the electromagnetic field radiated by the lightning strike.
Cables, pipes, antennas, and all metallic masses are likely to become conductive within a perimeter proportional to the power and speed of the lightning strike.
Earthmoving:
The overvoltage phenomenon originates from the electronic effects of a direct lightning strike or from the dissipation of lightning current carried by the lightning rod's grounding system to the installation's grounding.
Lightning current can also travel back up the network through the grounding system.
Earth potential increases:
The overvoltage phenomenon originates from the dispersion of current in the ground, causing destructive potential differences between the masses of the equipment and the networks to which they are connected.