
Maria Lupo
Charge Accumulation in Polymers for SF6-Free Hybrid Gas/Solid Insulation System.
Rel. Fabio Freschi. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Elettrica, 2025
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Abstract: |
Climate change is pushing the electrical engineering community to replace sulfur hexafluoride, the most potent greenhouse gas currently used in high- and medium-voltage insulation systems. In this context, hybrid insulation systems—combining a solid dielectric, typically a polymer, with an environmentally friendly gas—represent a promising alternative. However, ensuring their reliability requires a deep understanding of charge accumulation phenomena at gas/solid interfaces, which strongly influence the initiation of electrical discharges. This thesis investigates surface charge dynamics in polymeric materials (PP, PVC, PVDF, PTFE) through surface potential decay (SPD) measurements. The decay curves were analyzed to estimate the trap density within the dielectrics and fitted using a bi-exponential model to extrapolate the potential evolution over extended time periods. The extracted surface charge densities serve as input for a numerical model developed in COMSOL Multiphysics®, enabling the simulation of a realistic electric field distribution in a triple point configuration where surface charge accumulation is taken into account. Based on this model, the streamer inception criterion is evaluated. The results contribute to a deeper understanding of pre-breakdown mechanisms in 𝑆𝐹6-free hybrid insulation systems and support the design of more reliable and sustainable high- and medium-voltage insulation systems. |
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Relatori: | Fabio Freschi |
Anno accademico: | 2025/26 |
Tipo di pubblicazione: | Elettronica |
Numero di pagine: | 77 |
Soggetti: | |
Corso di laurea: | Corso di laurea magistrale in Ingegneria Elettrica |
Classe di laurea: | Nuovo ordinamento > Laurea magistrale > LM-28 - INGEGNERIA ELETTRICA |
Ente in cotutela: | INSTITUT NATIONAL POLYTECHNIQUE DE GRENOBLE (INPG) - ENSE 3 (FRANCIA) |
Aziende collaboratrici: | G2ELab |
URI: | http://webthesis.biblio.polito.it/id/eprint/37009 |
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