Breakdown Prediction Modelling of XLPE Insulation under HVDC Thermoelectrical Stress

Abstract

Understanding and monitoring the breakdown of insulating materials for power cable is a key societal aspect for energy distribution improvement. This work aims to study the impact of semicon (SC) protrusions produced in Cross-Linked Polyethylene (XLPE) extruded cables on their performance for High-Voltage Direct Current (HVDC) distribution. The breakdown strength of a SC-XLPE-SC material is measured in presence of an artificial protrusion. In parallel, a physical model based on microstructural state distribution of an XLPE material is used to simulate a numerical breakdown test with and without protrusion. Experimental and numerical results are compared and discussed.