Defend security and online security of Surge Protection Device (SPD) which related directly whether the railroad signal is correct.

电涌保护器(SPD)的防护安全性和在线安全性，直接关系到铁路信号的正确与否。

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Combining the actual situation of existing refuelling station, this article describes the necessity of setting up surge protection device (SPD) in refuelling station.

结合现有加油站的实际情况，阐述了加油站设置电涌保护器(SPD)的必要性。

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