This type of overvoltage is called lightning incoming wave4 .

此类过电压称为雷电侵入波。

It is safe with overvoltage , shortcircuit and overcurrent protection .

它与过压安全，短路和过流保护。

The path that the overvoltage caused by lightning intruded into the communication equipment and the cause of the equipment damage due to lightning attack were introduced .

介绍了雷电等过电压侵入通信设备的途径以及雷击损坏通信设备的原因。

In a building , how do we provide for protection against overvoltage switching ? What are its origins and magnitude ? How do we protect against it ?

在一幢建筑里，我们如何防护过电压转换？它的来源和幅值是什么？我们如何防护它？

Dielectric level is an important technical and economic parameters in uhv transmission , moreover multiple of overvoltage have the direct relation with dielectric level .

特高压输电技术的一个重要技术经济参数是绝缘水平,而与绝缘水平有直接关系的就是过电压倍数。