标准摘要
[中文适用范围]: IEC 60099的这一部分涵盖了具有外部串联间隙的金属氧化物避雷器(外部间隙线路避雷器(EGLA),应用于架空输电和配电线路,仅用于保护绝缘子组件免受雷击引起的闪络。该标准将避雷器定义为仅保护绝缘子组件免受雷击引起的过电压。因此,由于金属氧化物电阻器并非永久连接到线路,因此本标准不考虑以下项目: ? 开关脉冲跳火电压; ? 陡峭电流下的残余电压? 开关电流冲击; ? 热稳定性; ? 长持续电流冲击耐受负荷; ? 避雷器工频电压与时间特性; ? 隔离开关试验; ? 工频电压老化负荷。针对架空输配电线路的特殊应用,引入了一些独特的要求和试验,如绝缘子耐压与EGLA防护等级配合的验证试验、续流开断试验、机械负载试验等。采用EGLA外系列进行设计本标准不包括与绝缘子平行安装的间隙。 [外文原描述]: IEC 60099-8:2011 covers metal-oxide surge arresters with external series gap (externally gapped line arresters (EGLA) that are applied on overhead transmission and distribution lines, only to protect insulator assemblies from lightning-caused flashovers. This standard defines surge arresters to protect the insulator assembly from lightning-caused overvoltages only. Designs with the EGLA's external series gap installed in parallel to an insulator are not covered by this standard.
英文名称Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV