First commercial application of new monitoring systems against water ingress and overtemperatures in HV-XLPE cables

The paper describes the first 110 kV XLPE cable installation fitted with two monitoring systems: a system for monitoring the ingress of water into the cable in the event of sheath damage, given that water ingress could adversely affect the XLPE insulation. The real time thermal rating (RTTR) performance management system, which based on temperature and load monitoring enables cables to be more effectively loaded without exceeding thermal limits. General aspects of monitoring are discussed, together with the individual steps helpful to users for checking if monitoring offers advantages in their application