The nonlinear electrical properties and stability against dc accelerated aging stress of various varistors which are composed of zno pr6o11 coo cr2o3 dy2o3 zpccd based ceramics was.
Voltage ageing of zinc oxide ceramics.
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Voltage ageing in various fluids air sf6 transformer oil of zinc oxide based ceramics for hv and ehv surge arresters enabled the following points to be elucidated.
The study of a c.
Voltage ageing of zinc oxide ceramics ieee transactions on power delivery vol.
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Zinc oxide zno varistor ceramics consisting of zno with small amounts of additives such as bi 2 o 3 sb 2 o 3 coo cr 2 o 3 and mn 2 o 3 exhibit excellent nonlinear current voltage i v characteristics and large surge absorption capability thus they are widely employed for overvoltage protection in power systems and electronic devices 1 2.
Two classes of blocks are identified.