Effect of insulation properties on the field grading of solid dielectric DC cable

The development of solid dielectric DC transmission class cable is a priori ty throughout much of the world to avoid risks associated with placing hydr ocarbon fluids in underwater environments. However the conductivity of poly meric solid dielectrics tends to be a strong function of temperature and el ectric field. Based on measured material properties, we demonstrate effect of such dependences on the field grading of DC cable for the range of measu red material properties and provide a analytical approximation for computin g the field of resistively graded dielectrics including the effect of tempe rature and field-dependent conductivity.