电涌保护器电压保护水平值的合理判定

摘要

Through the analysis of a lightning protection scheme,the correct understanding of the nominal parameters such as discharge current and voltage protection level (Up) in the lightning protection design scheme of the Surge Protective Device (SPD).Based on two types of products of SPD Ⅱ level tests,comparing and analyzing the data in the test reports,it is found out that Up should be judged not only according to the marked value on the name plate of a SPD,but also determined by considering comprehensively the data in the test report of the SPD.So it is suggested that the manufacturers provide several Up values corresponding to the characteristic current values under the nominal discharge current values,according to the test reports,or provide a figure of the inrush current residual voltage curve in the product description to help users in understanding of the characteristics of SPD pressure limits.%通过对一个防雷设计方案的分析,阐述了如何正确理解防雷设计方案中电涌保护器(SPD)的标称放电电流、电压保护水平(Up)等参数.通过对两个型号的Ⅱ级试验SPD检测报告中数据的对比分析,指出不应仅以SPD的铭牌上标注的电压保护水平(Up)值作为电压保护水平是否符合设计要求的依据,应结合SPD检测报告中的数据综合判断.建议生产商根据检测报告,标注几个标称放电电流值以下的特征电流对应的Up值,或者在产品说明中绘制冲击电流残压曲线图,完善SPD限压特性的描述.