Effects of multiple impulse currents on the microstructure and electrical properties of metal-oxide varistors

The multiple impulse currents that are associated with a lightning ground flash have a stronger degradation effect on the electrical properties of metal oxide varistors than single pulses. It has been found that this degradation is associated with the formation of cracks extending between the contac...

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Bibliographic Details
Published in:IEEE transactions on electrical insulation 1992-06, Vol.27 (3), p.586-592
Main Authors: Sargent, R.A., Dunlop, G.L., Darveniza, M.
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
Breakdown voltage
Circuit testing
Connection and protection apparatus
Degradation
Electric variables
Electrical engineering. Electrical power engineering
Exact sciences and technology
Insulation testing
Lightning
Microstructure
Varistors
Zinc oxide
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Summary:The multiple impulse currents that are associated with a lightning ground flash have a stronger degradation effect on the electrical properties of metal oxide varistors than single pulses. It has been found that this degradation is associated with the formation of cracks extending between the contact surfaces of the devices which are filled with an amorphous material. These defects probably develop because of the formation of highly localized conduction paths during the application of the current pulses.< >
ISSN:0018-9367
1557-962X
DOI:10.1109/14.142723