ACCURATE MODELING OF FIELD STRESSES IN AN UNSHIELDED 3-CORE POWER CABLE

This paper uses the charge simulation technique to calculate the poten tial and electric field stress distribution at the surfaces of the con ductors and the dielectric of an unshielded three-core power cable. Th e conductors and the sheath are simulated by a suitable finite number of complex line charges. The unshielded three-core cable is placed on a grounded plane and at varying heights above it to calculate the elec tric field as a function of the height of the insulated cable from the ground. The maximum value of the electric field stress at the grounde d plane due to the presence of the insulated three-core cable is detec ted to check the discharge activities at the grounded plane surface. C omparison is made with field stresses arising from a single-core unshi elded insulated cable which are given in the literature. The charge si mulation technique is found to be satisfactory to model and calculate accurately the field stresses in a three-core unshielded power cable.