Title :
Ageing study of ZnO-based varistors in transformer oil
Author :
Meshkatoddini, M.R. ; Loubiere, A. ; Bui, A.
Author_Institution :
Electr. Eng. Lab., Univ. Paul Sabatier, Toulouse, France
Abstract :
In this paper the AC ageing of ZnO-based varistors in transformer oil is studied by an accelerated ageing during 6000 hours. Three kinds of varistors have been studied: 1-non-coated, 2-coated by resin and 3-coated by glass . As well the thermal behaviour of varistors has been studied at different temperatures and voltages. It is found that the coating and environmental conditions have a great influence on the thermal behaviour and the lifetime of varistors. The oil improves their thermal behaviour. As well it improves the I(V) characteristics of the coated varistors while for the naked ones it causes a premature degradation. It is seen that glass could be, from the thermal point of view, a good material for coating the varistors
Keywords :
II-VI semiconductors; ageing; ceramics; life testing; semiconductor device testing; transformer oil; varistors; zinc compounds; 6000 hr; AC ageing; I(V) characteristics; ZnO; ZnO-based varistors; accelerated ageing; ageing study; coating; environmental conditions; glass coating; noncoated varistors; premature degradation; resin coating; thermal behaviour; transformer oil; varistor lifetime; Aging; Arresters; Coatings; Glass; Oil insulation; Resins; Surges; Temperature; Threshold voltage; Varistors;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1995. ICSD'95., Proceedings of the 1995 IEEE 5th International Conference on
Conference_Location :
Leicester
Print_ISBN :
0-7803-2040-9
DOI :
10.1109/ICSD.1995.523036
