Stress Distribution In Two Layers Of H.V.D.C Cable Insulation For Cooling Outer Conductor

Abstract

In DC transmission, Stress inversion is a complex phenomena occurring in the cable insulation seriously hampering the design of HVDC cables. Radial variation of the temperature dependent DC conductivity, forces the stress inversion under certain conditions. A new proposed power cable with two insulation layers (XLPE and oil) with forced coolant oil has been analyzed under DC voltage to improve the performance of DC cables. The new proposed cooling method increase the ampacity of the cable, reducing space charge affection and reducing the radial temperature drop which is in turn causing less variation in DC stress distribution.