Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français français
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-06-10

High power zinc oxide based varistors

Objectif



Zinc oxide based ceramics possesses the remarkable property, following which its resistance decreases abruptly when the applied voltage exceeds a certain value called threshold voltage Vs. This property is used for the protection of electrical grids and electronic systems against overvoltage coming from lighting strokes. The component using this material (varistor) is used currently in the world and replaces SILICON Carbide based devices or gas spark gap. This activity generates in the world approximately 200 to 250 Millions Ecus per year.

Current research in the world concerns different points. It focuses on the utilization of others materials than the oxide of zinc, manufacturing processes (notably with the mixed powder obtained by chemical way), the improvement of the stability of their electrical characteristics during the aging, the reduction of the varistor volume of the in view to reduce its cost.

The proposed research project comprises two large parts, a research based on the ceramic material and two applications. On the material side, this project aims to increase the threshold voltage Vs of the varistor with the same characteristics concerning dimensions, the aging and the capacity of energy absorption in view to reduce the quantity of the raw material and the consumption of electrical energy needed for sintering.

With these new and improved varistors we undertake in this programme researches on :

the utilization of these new varistors in medium voltage arresters : dimensioning the arrestors, voltage repartition study of varistors mounted inside the arresters, behaviour of arresters in the electrical grids
the utilization of varistors in power electronic commutation circuits : thermal behaviour of varistors in high repetition frequency of overvoltage, dimensioning, method of varistor cooling.

There are 6 partners in the consortium geographically situated in the south part of Europe and of complementary competence. Two Laboratories, members of the EU, are Toulouse Electrical Engineering Laboratory (Fr, Coordinator and specialized in varistor research and electrical tests) and the High voltage Institute of the Technical University of Athens (Gr and specialized in High voltage testing). The two partners coming from Romania are an Institute of Research ICPE (Research and production of small quantities of varistors for national use) and a academic Laboratory, the Electrotechnic Department of The Technical University of Bucharest (Specialized in the power electronics). The last two members are in Slovenia: Iskra Varistors (a small size manufacturer and exporter of low voltage varistors) and the Josef Stefan Institute (specialized in the research on manufacturing processes and the analysis of the ceramics microstructure).

Advantages that one can take from this programme of research that last three years are the following :

From the knowledge point of view, the comprehension of the mechanism of the growth of Zinc oxide grains with a spinelle phase, the correlation between the ceramic microstructure and its electrical properties.
From the economic point of view, a reduction of the volume of the raw material and the quantity of energy needed to make a varistor.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

UNIVERSITE PAUL SABATIER DE TOULOUSE III
Contribution de l’UE
Aucune donnée
Adresse
Route de Narbonne 118
31062 Toulouse
France

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (5)

Mon livret 0 0