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Space charge measurements in XLPE insulated mid-voltage cable: correlation with cable performance
Tamayo Ávila, Idalberto; Orrit Prat, Jordi; Diego Vives, José Antonio
Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa; Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. DILAB - Laboratori de física dels materials dielèctrics
Three experimental midvoltage XLPE cables, C2, C3 and C4, rated respectively as 'good', 'very good' and 'bad' in perforation tests, are studied. All these cables have been systematically measured by PEA as produced and after being annealed at 90ºC and 120ºC up to 672 hours. Measured internal charge of cable C4 at least doubles that of cables C2 and C3. Evolution with annealing show as well differences in the reticulation process carried out during cable C2 and C3 preparation, which can explain why cable C3 performs better than C2 in perforation tests. Infrared spectroscopy measurements (IR) showed differences in components injected from the external semiconducting layer (SC) into the isolation during annealing. These results explain other observed differences in PEA measurements with regard of the SC type of each cable. To sum up, combination of PEA and IR measurements are a useful tool in understanding charge relaxation processes and XLPE cable performance.
Peer Reviewed
Àrees temàtiques de la UPC::Física::Física molecular::Espectroscòpia molecular
Molecular spectroscopy
Espectroscòpia molecular

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