An Integrated Diagnostic Framework of Electrochemical Analysis for Assessing Silicone Oil Health in HV Cable Outdoor Terminations

Up to now, Terna, the Italian Transmission System Operator (TSO) has installed a total of 4305 km of High Voltage insulated cable lines. A key component of an insulated cable system is the termination, which comes in a variety of designs depending on the characteristics of the insulator, cable screen connection, dielectric material and other factors. In the following, dielectric oil insulated outdoor terminations are examined in detail. Cable terminations are typically engineered to be maintenance free; nevertheless, a variety of operational stresses or anomalies, such as temperature cycling, mechanical loads, water ingress, or simply time dependent degradation, can compromise their long-term electric performance. For this reason, targeted diagnostic checks are essential to ensure…