INSULATING MATERIALS FOR CABLES

Electrical insulation materials are employed over the metallic conductors of
underground cables at all voltage ratings. Polymeric materials are employed as
the insulation, but the nature of the polymer may vary with the voltage class.


POLYMER TYPE PROPERTY >>Low Density Polyethylene Low dielectric losses Moisture sensitive under voltage stress


Crosslinked polyethylene>> Slightly higher losses vs. PE Ages better than PE


EPR / EPDM>>Higher losses vs. XLPE or PE More flexible than XLPE or PE Requires inorganic filler


PVC >>Must contain plasticizer for flexibility
Higher losses