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underground substation grounding

underground substation grounding

underground substation grounding

(OP)
hi,
anyone familiar with grounding methods for underground applications? the challenge here is to provide effective grounding for a 25kV substation 3km underground.
the soil is highly resistive, and primarly rocks.
any ideas/references/articles would be appreciated.
thanks.   

RE: underground substation grounding

You will probably be OK using standard step- and touch-potential calculations if there is a good solid metallic ground connection to the source.  The current split between earth return and ground wire return will ensure that the current flowing into the earth will be relatively small.
 

RE: underground substation grounding

The underground substation grounding design has similarity to indoor AIS or GIS substation application.

Take advantage of any concrete slab, rebar or foundation (Ufer Ground Electrode) to be interconnected with the ground grid and also connected with the system ground.
 

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