PERFORMANCES DES VARISTRICES D'OXYDE DE ZINC-PENTOXYDE DE VANADIUM DANS LES parafoudres MOYENNE TENSION
DOI :
https://doi.org/10.59277/RRST-EE.2024.2.11Mots-clés :
Matériaux fonctionnels avancés, Oxydes métalliques, Varistances ZnO-V2O5, Parafoudres moyenne tensionRésumé
Disques de varistance à oxyde métallique (MOV) (Ø28 mm × 12 mm) composés de 97,5 % en moles d'oxyde de zinc (ZnO) et 0,5 % en moles chacun de pentoxyde de vanadium (V2O5), d'oxyde d'étain (IV) (SnO2), d'antimoine ( III) oxyde (Sb2O3), oxyde de cobalt (II, III) (Co3O4) et oxyde de chrome (III) (Cr2O3) ont été produits par métallurgie des poudres. Les MOV obtenus étaient polycristallins à haute densité. Cette étude s'est concentrée sur l'analyse de la microstructure et des propriétés mécaniques et électriques des MOV. Les MOV développés avaient une microstructure à grains fins avec une granulométrie moyenne de ZnO d'environ 10 µm. Les disques MOV recouverts d'Ag testés dans une plage de 100 à 1 300 V CA ont présenté un courant de fuite de 0,033 à 1,420 mA et une tension de varistance minimale de 2,37 ± 0,15 kV. Après avoir effectué des tests fonctionnels sur des MOV à revêtement Ag installés dans des parafoudres à boîtier polymère, il a été constaté qu'ils conviennent à une utilisation dans des parafoudres moyenne tension avec une tension nominale (Un) de 25 kV, une tension de fonctionnement continue (Uc) de 12 kV et un courant de fuite (IL) de 1 mA.
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