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.
Voltage ageing of zinc oxide ceramics.
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.
Two classes of blocks are identified.
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Those which exhibit a degradation in air and still a more significant degradation in sf6 or oil and those which do not show any visible degradation.
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.
Zinc oxide is an inorganic compound with the formula zn o zno is a white powder that is insoluble in water.