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The energy absorption capability and time-to-failure of varistors used in station-class metal-oxide surge arresters

1997; Institute of Electrical and Electronics Engineers; Volume: 12; Issue: 1 Linguagem: Inglês

10.1109/61.568242

1937-4208

K.G. Ringler, P.A. Kirkby, C.C. Erven, M. V. Lat, Tadeusz Malkiewicz,

Electrical Fault Detection and Protection

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 A/sub peak/ to 35 kA/sub peak/. Typical mean values increased from 400-600 J/cm/sup 3/ at the lower current end to 1600-2000 J/cm/sup 3/ at 35 kA/sub peak/. 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.