Soil Thermal Conductivity
Soil Thermal Conductivity
(OP)
We have a series of direct burried cables (800 sq.mm.) type for a 138 kV Switchyard.
The cables will be bedded in bedding sand; is there anyone that can provide guidance about calculating or determining the thermal conductivity of the soil enclosure. It has an impact on the heat generated within the soil enclosure.
Dik
The cables will be bedded in bedding sand; is there anyone that can provide guidance about calculating or determining the thermal conductivity of the soil enclosure. It has an impact on the heat generated within the soil enclosure.
Dik






RE: Soil Thermal Conductivity
RE: Soil Thermal Conductivity
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We have worked with Okonite in the past to calculate conductor ampacities for sand backfills. I'm not sure where they get their numbers.
The original Neher McGrath paper may have some information - I don't remember.
David Castor
www.cvoes.com
RE: Soil Thermal Conductivity
RE: Soil Thermal Conductivity
As an aside to this, cuky2000 noted that the rho of concrete is between 60-85 degC cm/watt. If this is a verifiable value, would you feel that on alternative to direct buried cables in sand would be to use concrete encased PVC conduit in which to route the cable?
Just a thought.
Regards,
EEJaime
RE: Soil Thermal Conductivity
UG ducts do provide other advantages, but it costs more.
RE: Soil Thermal Conductivity
thread238-117975: Electrical Duct Bank Calcs
RE: Soil Thermal Conductivity
thanks, Dik