Title :
The energy absorption capability and time-to-failure of varistors used in station-class metal-oxide surge arresters
Author :
Ringler, K.G. ; Kirkby, Peter ; Erven, C.C. ; Lat, M.V. ; Malkiewicz, T.A.
Author_Institution :
Ontario Hydro Technol., Toronto, Ont., Canada
fDate :
1/1/1997 12:00:00 AM
Abstract :
Varistors for use in station-class surge arresters were tested to destruction to determine their energy absorption capability at current levels ranging from 0.8 Apeak to 35 kApeak. Typical mean values increased from 400-600 J/cm3 at the lower current end to 1600-2000 J/cm3 at 35 kApeak. The product of the mean time-to-failure and the mean current was found to be a constant over five orders of magnitude. The varistor failure mode was found to be a characteristic of the current magnitude. It is recommended that standard test methods be developed for the energy absorption capability of metal-oxide surge arresters, and be included in relevant standards
Keywords :
arresters; failure analysis; substations; testing; varistors; 0.8 to 35 kA; energy absorption capability; mean current; mean time-to-failure; standard test methods; station-class metal-oxide surge arresters; time-to-failure; varistor failure mode; Absorption; Arresters; Current density; Inorganic materials; Standards development; Surge protection; Surges; Testing; Varistors; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
