A new generation of tree-retardant crosslinked polyethylene (TR-XLPE) insulation

Additive tree-retardant crosslinked polyethylene (TR-XLPE) has been utilized as medium-voltage power cable insulation for over 25 years, and has been recognized for excellent performance in retention of breakdown strength in both accelerated aging and field-service conditions. Now, an improved TR-XLPE insulation has been developed which will enhance the longevity and reliability of medium-voltage cables, and will offer the potential to deliver long-life performance in high-stress cable designs. The new technology builds upon the proven history of additive TR-XLPE, and incorporates careful selection and optimization of additional functional elements to provide a balance of performance in terms of resistance to water-treeing, long-term heat stability, crosslinking efficiency and scorch-retardancy. A comparative review of performance will be provided for the improved TR-XLPE technology against today's TR-XLPE, through evaluation of mechanical and electrical properties on both material samples and medium voltage cables. An update on long-term accelerated cable aging of the new insulation will also be provided.