Concrete Resistivity
Concrete Resistivity
(OP)
Does any one could advise the resitivity value of concrete for an indoor substation.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Concrete Resistivity
RE: Concrete Resistivity
htt
RE: Concrete Resistivity
RE: Concrete Resistivity
This may be an unusual installation where there is uncertainty to assume a reasonable concrete resistivity value for an indoor Gas Insulated Substation (GIS) rated for 138kV/345kV.
The GIS building is located in a metropolitan area with external sidewalk and asphalted streets, virtually isolate from rain and other external moisture sources other than the indoor climate controlled air conditioning system and ground moisture traveling throughout a new 3 ft thick concrete floor build on top of existing concrete structure resting in rocky soil.
Under the above conditions, the moisture may not be able to migrate easily to the surface of the new concrete floor and may be considered dry. Therefore, the expected resistivity of the concrete surface is considered higher than usual.
Even though, the assumption appears to have merits, there is not agreement among the designer team to support a reasonable representative concrete resistivity value to determine the allowable step and touch potentials and modeling the concrete slab.
Thanks for any further comments.
RE: Concrete Resistivity