Numerous model materials have been produced with different geometries, from tapes to cables, to ease the interpretation but also to remain as close as possible to the application. Experiments have been done under various conditions and temperatures, both in normal and accidental conditions. In comparison with the initial plan, more samples have been aged in more ageing conditions, and more measurements have been carried out; thus, increasing the scientific scope of the project.
All the characterisations were carried out at the different scales showing some unexpected results as the presence of antioxidant crystals. Thanks to this extensive database, kinetic models have been established for some materials considering fillers and antioxidant contributions for XLPE material. Difficulties were faced with a primary antioxidant within the material, notably due to the additional stabilizing effect of antioxidant crystals on the sample surface. Correlations have been highlighted between the changes in the dielectric and mechanical properties and changes in oxidation markers.
Based on this relationship, a multi-scale modelling has been suggested. This approach is very promising but needs to be challenged on fully formulated materials.
An open access tool has been set up integrating the multiscale models and providing the residual lifetime of cables knowing material data and the exposure conditions. The distribution of the TeaM Cables tool to the partners and end-user group has been done through workshops. The end-user group could satisfactorily test the tool and check the transposability of the models developed on data coming from in-service cables or from databases of previous projects.
In addition, six different non-destructive tests or micro-sampling techniques were further set up during the project. For each testing method, the measurement procedures have been further developed in a more detail level, some of them can be considered now to be verified in lab conditions and ready to be demonstrated in an on-site environment.
In parallel to the progress of scientific activities, the TeaM Cables consortium has also performed many dissemination activities to raise awareness of the project. The project has continued to be active in dissemination during the overall project duration by publishing 38 peer-reviewed papers and by participating to 16 scientific conferences.
