低压浪涌保护装置的元件.第312部分:气体放电管的选择和应用原则

[中文适用范围]： 标称系统电压高达 1 000 V（rms）交流和 1 500 V 直流的电信、信号和低压配电网络中的保护 它们被定义为一个间隙或多个带有两个或三个金属电极密封的间隙，以便气体混合物和压力均受到控制。它们旨在保护设备或人员或两者免受高瞬态电压的影响。该标准提供了有关具有两个或三个电极的 GDT 的特性和电路应用的信息。该标准没有规定适用于完整的电涌保护装置的要求，也没有规定电子设备中使用的 GDT 的总体要求，其中 GDT 性能和电涌保护装置耐受能力之间的精确协调非常关键。 [外文原描述]： IEC 61643-312:2013 is applicable to gas discharge tubes (GDT) used for overvoltage protection in telecommunications, signalling and low-voltage power distribution networks with nominal system voltages up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c. They are defined as a gap, or several gaps with two or three metal electrodes hermetically sealed so that gas mixture and pressure are under control. They are designed to protect apparatus or personnel, or both, from high transient voltages. This standard provides information about the characteristics and circuit applications of GDTs having two or three electrodes. This standard does not specify requirements applicable to complete surge protective devices, nor does it specify total requirements for GDTs employed within electronic devices, where precise coordination between GDT performance and surge protective device withstand capability is highly critical. Keywords: gas discharge tubes (GDT), overvoltage protection in telecommunications, signalling and low-voltage power distribution networks, nominal system voltages up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c. The contents of the corrigendum of July 2013 have been included in this copy.