A few aspects concerning a new varistor material for low and medium voltage surge arresters

ZnO varistors are essentially ceramic poly-crystalline n - semiconductors. They are applied in making all type of surge-arresters due to some important advantages such as: a high level of non-linearity for the current-voltage characteristic, a high energy absorption capacity and an excellent respons...

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Bibliographic Details
Published in45th International Universities Power Engineering Conference UPEC2010 pp. 1 - 4
Main Authors Frigura-Iliasa, M, Solomonesc, F, Frigura-Iliasa, Flaviu M, Andea, P
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2010
Subjects
Chemicals
low and medium voltage
Materials
Semiconductor device measurement
surge arresters
varistor material
Varistors
Voltage measurement
Zinc oxide
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Summary:ZnO varistors are essentially ceramic poly-crystalline n - semiconductors. They are applied in making all type of surge-arresters due to some important advantages such as: a high level of non-linearity for the current-voltage characteristic, a high energy absorption capacity and an excellent response time (less then 100 ns), which make them useful for protecting other sensible electronic devices. This paper presents a new manufacturing technology for ZnO based varistors and a new mixture of oxides used in order to obtain a new material with non-linear electric properties. The oxides involved are Cr 2 O 3 and MnO 2 as additives. This varistor material has a smaller electrical capacity, suitable even for telecommunication applications. The new technology is simply to apply by any manufacturer. Started from chemical measurements, and finished by electrical tests, the experimental part of this paper is an Interdisciplinary research. A new and simple method of testing the electric capacity of a certain varistor is presented, based on the oscilloscope measurements at various frequencies.
ISBN:9781424476671
1424476674