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Effect of ambient conditions on the resistance of metal oxides as a novel material for outer corona protection systems

Title data

Wagner, Ricarda ; Bauer, Johann ; Plochmann, Bastian ; Lang, Steffen ; Schönauer-Kamin, Daniela ; Moos, Ralf:
Effect of ambient conditions on the resistance of metal oxides as a novel material for outer corona protection systems.
Event: 36th Electrical Insulation Conference (EIC) , 17.-20.6.2018 , San Antonio, TX, USA.
(Conference item: Conference , Poster )

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Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

Antimony doped tin oxide, a known gas sensing material, is investigated as a possible substitute for carbon black as filler for outer corona protection systems. Therefore it is necessary to prove the stability of electrical resistance and reversibility during exposure to discharge products like UVradiation, ozone and NO2. Furthermore, the location of aircooled generators can vary and with it the surrounding atmosphere, for example humidity. Samples of particle filled resin films are prepared and the resistance is measured while exposed to different diluted gases (varying O2, H2, humidity and NO2 in the gas atmosphere at 100 °C). The resistance changes with varying O2 (%-range) and NO2 (ppm-range) concentrations. These effects are enhanced by UV-radiation (365 nm). All measured resistance changes are reversible but there is a long relaxation time. Besides, both the matrix material and the particle geometry of the Sb-doped SnO2 were changed. It was found that the resistance stability depends on the combination of matrix material and particle geometry. We found a link between resistance change and surface roughness, whereby a smoother surface seems to be more stable. The influence of ozone on the film resistance was also measured: Small amounts of ozone (< 1ppm) do not change the resistance of a compound film during ten days at room temperature. Hence, it is concluded that antimonydoped-SnO2-compound-films are stable against different gas species and UV-light. However, it is important to choose a proper particle-resin combination for a smooth surface resulting in improved resistance stability.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 04 Jul 2018 05:50
Last Modified: 04 Jul 2018 05:50