暂时过电压对SPD后备保护的影响

施加给电气装置的电压如超过电气装置的标准电压,称作过电压。低压电气装置可能出现各种过电压,例如由于电网和电气装置运行条件的变化引起工频电源电压变化而出现缓慢而持续的线间过电压。本文分析了低压系统暂时过电压形成原因,并给出了不同供电制式下的最大暂时过电压值。探讨了暂时过电压对SPD的影响及SPD后备保护需要注意的问题。

Influence of Temporary Overvoltage on SPD Backup Protection

If the applied voltage of an electrical device is higher than its standard voltage, it is called overvoltage. Low voltage electrical device may appear all sorts of overvoltage. For example, the condition changes of power grid and electrical equipment can cause power frequency voltage change and lead to the slow and steady line-to-line overvohage. The low voltage system temporary overvohage formation reasons are analyzed in this paper and the maximum temporary overvoltage value under different power supply system is given. The influence of temporary overvoltage on SPD is discussed and the problems needing attention in SPD backup protection are also discussed.