Elevated temperature operation of XLPE distribution cable systems

The long-term operation of existing and new cross-linked polyethylene (XLPE) cables at elevated temperatures of 90 degrees C or even higher is of concern to utility operating engineers, particularly where thermoplastic shields are used. By deferring the installation of new cables and operating existing cable systems at higher temperatures near or above the normal maximum, economic advantages can be gained. An investigation was initiated to understand how medium voltage cables perform at elevated temperature and how much damage is done during high temperature operation. Evaluation of specific material properties and the use of bench-top testing and full-size cable load cycling aid this understanding.<>