从过电压角度解析低压配电系统SPD的装设和选择

SPD Installation and Selection of Low voltage Power Distribution System from Overvoltage Perspective

通过对低压配电系统大气过电压、操作过电压产生原因的分析,解析建筑物第一级电涌保护器(SPD)的装设情况及分类试验的选择。阐述了装设第二级SPD及后续级SPD的校验条件和步骤。通过对低压系统暂时过电压最严重情况下最大值的分析,阐述了SPD暂时过电压耐受值的选择,以供电气设计人员参考。

By analyzing the cause of atmosphere overvoltage and operation overvoltage in low voltage electrical system,this paper analyzed the installation conditions and the group test selection of the building＇s first level of surge protective device（ SPD）,and elaborated the check requirements and steps of installing the second level and subsequent level SPD. By analyzing the maximum value under the situation of the most serious temporary overvoltage in low voltage system,the selection of temporary overvoltage withstanding value of SPD was parsed. It could provide references for electric designers.