"Reg Edwards" wrote in message
...
Time-related transients in systems of conductors are more accurately
analysed by considering the conductors to be transmission lines.
Propagation
velocity and characteristic impedance are essential features to be
approximated. Reflections are also important factors.

Applies equally to lightning conductors.

Now carry on with your thesis.
----
Reg Edwards.

Reg, I think he might be referring to the transfer-times from a conductor to
different components of soil. Not the transmission line theory inside a
conductor. The reaction speed of ground systems are under a lot of study to
help determine the best control of ground potential rise (GPR) where
isolation by fiber optic or HV isolation transformers alone is insufficient
protection.

Water/wet soil along the soil surface during a strike attachment makes it
hard to control GPR when it connects multiple earthing points almost
instantaneously. The dry-ground sections of each earthing rod end up making
less contribution to the designed voltage division, and increased current
from grounding systems up into the interior of buildings is one result.
It's an interesting problem creates and conflicts between design approaches
for lightning protection. What works for direct attachment will not work for
the near-field, in other words.

Best regards

Jack Painter
Virginia Beach VA