组合型电涌保护器设计方法的研究  

Research on Design Method of Combined Surge Protection Device

作　　者：李祥超[1] 张静[1] 陈良英[1] 薛奇[1] 

机构地区：[1]南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室,南京210044

出　　处：《电瓷避雷器》2017年第4期16-22,共7页Insulators and Surge Arresters

基　　金：973国家重点基础研究计划(编号:2014CB441405)

摘　　要：针对组合型电涌保护器(SPD)利用氧化锌(Zn O)压敏电阻与气体放电管组合的设计方法的问题,理论分析了Zn O压敏电阻的块体模型和气体放电管工作原理;采用8/20μs模拟雷电流,对不同组合方式的Zn O压敏电阻与气体放电管进行了冲击测试,得出组合结构SPD主要性能体现在并联或并联的气体放电管数量的试验结果,即压敏电阻并联的气体放电管数越少,组合型SPD的残压越低;串联气体放电管数越多,压敏电阻的通流越小,可有效延长了压敏电阻的使用寿命;当气体放电管两端的电压达到直流放电电压时,气体放电管迅速导通,使整个组合器件两端电压迅速减小;随冲击电压的升高,残压增大,通流呈线性增加,平均斜率为3.21。在组合型SPD的设计中具有一定的参考价值。The design of the combined surge protection device （SPD） utilizes ZnO varistors and gas discharge tubes（GDT） together, based on the theoretical analysis to the block model of the ZnO varistor and the working principle of the GDT. Through the 8/20 Ixs waveform simulating the lightning wave, conclude that the combined SPD mainly reflects the characters of the multipled GDT or the quantity, which means that the voltages goes down with the decrease of the quantity of multipled GDT, the currents of the ZnO varistor being lower with the increase of the tandem GDT. When reaching the DC discharger voltage, the GDT conducts promptly and the voltage decrease rapidly. Both the voltages of the SPD and the currents are increased with the impulse currents, the linear increased SPD current,the average slope being 3.21. The voltages go down with the reductive GDTs in parallel. The add to the cascade GDT follows the diminution of the current of the ZnO varistor whose service life is prolonged, which have reference to the design of the combined SPD.

关 键 词：组合型SPD ZNO压敏电阻 块体模型 气体放电管 通流 残压 

分 类 号：TM862[电气工程—高电压与绝缘技术]