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Touch & Step Potential for Lightning Protection System

Touch & Step Potential for Lightning Protection System

Touch & Step Potential for Lightning Protection System

(OP)
Touch and Step Potential calculations:
I am doing lightning protection design for a commercial workshop building using lightning rods and downconductors all connected to a earthing grid system as per the Australian standards AS1798 (1991).
I have not been able to calculate the touch and step potentials in the event of a lightning strike.  Could anyone help, please.
Thanks

RE: Touch & Step Potential for Lightning Protection System

As a starting point, I would think you would have to assume a value for the lightning strike current. I don't have access to AS1798. Does it specify this?

RE: Touch & Step Potential for Lightning Protection System

This is a very difficult calculation because the impedance of the grounding system is very frequency dependent and a complex electromagnetic analysis is required.  See Study of Transient Ground Potential Rise in Gas-Insulated Substations during Fault Conditions using Electromagnetic Field and Circuit Theory Approaches at http://www.sestech.com/software_packages/pdf/User2000_A.pdf

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