摘要
通过试验,分析了8/20脉冲次数及电流峰值对ZnO压敏电阻工频耐受性能的影响。在脉冲次数及电流峰值不同的情况下,电阻体内部发生结构性变化,导致其工频耐受性能发生变化。当脉冲电流峰值未超过某一临界值时,工频耐受时间随着冲击次数的增加而延长,超过此临界值时,工频耐受时间随着冲击次数的增加而缩短;在8/20脉冲次数一定的条件下,工频耐受时间也随电流峰值的递增呈现先延长后缩短的趋势。
Through experimental, the effect of 8/20 pulse number and current amplitude on power frequency voltage withstand capacity of ZnO varistors is analyzed. With different pulse number and current amplitude, the texture change take place in varistor, leading to variation of its power frequency voltage withstand capacity. At current amplitude below a certain critical value the power frequency voltage withstand duration increases as the pulse number raises, meanwhile beyond the critical value it will be decreased as the pulse number raises. At a given pulse number, the power frequency voltage withstand duration tend to increase at first and then decrease as the current amplitude raise.
出处
《电瓷避雷器》
CAS
2006年第4期41-43,共3页
Insulators and Surge Arresters
关键词
氧化锌压敏电阻器
脉冲次数
电流峰值
工频耐受
ZnO varistor
pulse frequency
electric current peak value
power frequency withstand