A New Method for Cable Joints Thermal Analysis

A general analytical method for thermal analysis of a joint in an oil-filled high-voltage cable is presented. Oil flow within the conductor oil duct, longitudinal heat flow through the conductor, and conductor losses variation with temperature are taken into consideration. The method is applied for a straight joint in a 300 kV, 2000 mm2 integral sheath cooled oil-filled cable. The theoretical temperature distributions along the conductor from joint to cable are in good agreement with the corresponding experimental results.