Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
A power cable is a device that carries or conducts power to an electrical appliance and it is used for the transmission or distribution of electricity. Power cables are formed by conductor strands of high conductivity metals such as aluminum or copper, surrounded by polymeric insulated materials. Among the polymeric insulated materials are the conductor screen, insulation material, insulation screen, sheathing Material and sometimes, aged in the type of cable, a few other layers of materials.
All the materials that form a power cable are plastic, except for the conductor. The plastic materials age over time, generating as a result failure, break or cease of its function. The most important processes that decrease the lifespan of a cable are the termooxidative degradation and electrical treeing. In the termooxidative degradation, the most important factors that affect the lifespan are the type of plastic materials, the presence of other chemicals in the cable system, the temperature and contact with liquids.
One of the objectives of this work is to study the lifespan of different conductor screen materials, regarding their compatibility in different oils present in the production process.
Likewise, the influence of the degree of crosslinking on the lifespan of conductor screen materials was studied, considering the ageing in oil. For this determination, two levels of crosslinking degrees were studied and compared.
Finally, the influence of water trees in the structure or constitution of the conductor screen, XLPE insulation and the interface between them was evaluated, after the electrical ageing of cables. The influence was observed on the surface of electrically aged cables, using a Scanning Electron Microscope.
2011. , 82 p.