Résumé
Estimating the lifetimes of energy cable insulations before their commissioning and calculating the consumed lifetimes after a certain period of operation, as well as the remaining lifetimes, are extremely important issues for cable manufacturers and users. This paper proposes a method for calculating insulations lifetimes, taking into account their electrical and thermal stresses, which could be constant and/or variable during their operation. Calculations performed on a single-phase cable insulated with cross-linked polyethylene (XLPE) show that the values of estimated and remaining lifetimes decrease, while those of consumed lifetimes increase with the electric field intensity and operating temperature.