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000000144 037__ $$aENY-ARTICLE-2008-115
000000144 041__ $$aeng
000000144 088__ $$aI07/2004/I-019
000000144 100__ $$aJaroszewski, M$$uWroclaw University of Technology, Poland
000000144 245__ $$aAn assessment of ageing of oxide varistors exposed to pulse hazards using dielectric spectroscopy
000000144 260__ $$c2004-04-05
000000144 300__ $$a4p
000000144 500__ $$aProceedings of the 2004 IEEE International Conference on Solid Dielectrics. ICSD 2004, Toulouse, France, July 5-9, 2004. Vol. 2. Piscataway, NJ : IEEE Service Center, 2004. pp. 727-730
000000144 520__ $$aThe common use of zinc oxide varistors has brought about qualitative changes in the overvoltage protection of electronic and electric power equipment. This is due to the special properties of ZnO varistors, mainly the high current-voltage characteristic nonlinearity and the capacity to withstand strong current surges. In service conditions varistors are exposed to the sustained action of constant or variable voltage or momentary overvoltage pulses. As a result varistors may undergo degradation reflected in changes in their current-voltage characteristics. The changes are manifested in an increase in leakage current and are limited to a highly thermally activated low-current region where the performance of the varistor is determined by the parameters of the potential barriers. Thus one can conclude that the degradation is a result of processes leading to the movement of ions and the deformation of the potential barriers. Therefore dielectric spectroscopy (testing of the dielectric response in a wide frequency band) could be useful for the investigation of degradation changes, and so this method is proposed in this paper.
000000144 6531_ $$adielectric spectroscopy
000000144 6531_ $$aovervoltage pulse
000000144 6531_ $$aoxide varistor
000000144 700__ $$aPospieszna, J$$uWroclaw University of Technology, Poland
000000144 8560_ $$
000000144 8564_ $$u$$zAccess to Fulltext
000000144 909CO $$$$pglobal
000000144 980__ $$aARTICLE