Voltage Ageing Of Zinc Oxide Ceramics

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.

It is used as an additive in numerous materials and products including cosmetics food supplements rubbers plastics ceramics glass cement lubricants paints ointments adhesives sealants pigments foods batteries ferrites fire retardants and first aid tapes. Zinc oxide is an inorganic compound with the formula zn o zno is a white powder that is insoluble in water. 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. 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.

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. Two classes of blocks are identified. Voltage ageing of zinc oxide ceramics ieee transactions on power delivery vol. The portal can access those files and use them to remember the user s data such as their chosen settings screen view interface language etc or their login data.