1）用于保护电气设备免受高瞬态过电压危害并限制续流时间也常限制续流幅值的一种电器。本术语包含运行安装时对于该电器正常功能所必须的任何外部间隙，而不论其是否作为整体的一个部件。
1) An electrical appliance used to protect electrical equipment from high transient overvoltage hazards and to limit the duration of continuous current, often limiting the magnitude of continuous current. This term covers any external clearance necessary for the normal functioning of the appliance during operation and installation, whether or not it is a component of the whole.
注1：避雷器通常连接在电网导线与地线之间，然而有时也连接在电器绕组旁或导线之间。
Note 1: The lightning arrester is usually connected between the wire of the power grid and the ground wire, but sometimes it is also connected beside the electrical winding or between the wires.
注2：避雷器有时也称为过电压保护器，过电压限制器（surge divider）。
Note 2: Arresters are sometimes referred to as overvoltage protectors, surge dividers.
摘自：《电工术语 避雷器、低压电涌保护器及元件》，GB/T 2900.12-2008。
From: Electrical Terminology Arresters, Low Voltage Surge Protectors and Components, GB/T 2900.12-2008.
2）避雷器是通信线缆防止雷电损坏时经常采用的另一种重要的设备。
2) Lightning arrester is another important equipment which is often used in communication cable to prevent lightning damage.