高梯度氧化锌电阻片的研制

使用高梯度氧化锌电阻片可以使避雷器小型化。在一定范围内增加Bi2O3、Sb2O3等添加剂的用量及掺加0.4%￣0.6%的Y2O3,有助于提高氧化锌电阻片电位梯度。严格控制原料的松装密度、粒度分布及水分等,如:Co2O3松装密度提高到0.6 g/cm3左右,使用效果良好。使用新型高效混磨设备,循环处理流量可达到5.4m3/h,效率比原来提高了30%以上,改善了电阻片微观均匀性。氧化锌电阻片电位梯度可达350V/mm,长持续时间电流冲击耐受800A。

Development of High Gradient ZnO Varistor

High gradient ZnO varistors may create MOA miniaturization.Increasing the Bi2O3 and Sb2O3 additive content with 0.4 %~0.6 % Y2O3 dozing might increase the voltage gradient of varistors.A satisfactory effect obtained with strict controlling loading density,particle size distribution and water content,for example,the optimized effect obtained at bulk,density of Co2O3 up to 0.6 g/cm3.Using new efficient mixing facility with cyclic capacity of 5.4 m3/h,the mixing rate was increased by 30% and varistor texture well improved.The varistor obtained has voltage gradient up to 350 V/cm and long duration surge withstand capacity of 800 A.