Validation of Mechanical Features of HPTE Insulation for EHV DC Land Cable Systems

HVAC and HVDC extruded cable systems present a series of operational and logistic constraints that should be taken into account. Reliability and on-time-delivery demand a fine tuning of all the steps of the project, from the cable manufacturing to the system installation. Innovative projects on large scale, such as the HVDC 525 kV German Corridors [1], require an accurate verification of the system performances, not only from an absolute point of view, but also relatively to the environmental constraints and the system design linked to the single projects. As regards HVDC cable accessories, the interface between the premoulded sleeve and the cable requires investigations from both the thermomechanical and the electrical point of view. This study aims at evaluating all these constraints.