标称电压高于 1000 V 的架空线路用绝缘子 交流系统用陶瓷或玻璃绝缘子单元 帽型和针型绝缘子单元的特性

[中文适用范围]： 本国际标准适用于额定电压大于1000V、频率不超过100Hz的交流架空线路中使用的帽针式陶瓷或玻璃绝缘子串单元。它也适用于变电站中使用的类似设计的绝缘子。 本文件适用于具有球窝连接或叉舌连接的帽针式绝缘子串单元。 本文件适用于在清洁区域和污染区域使用的架空线路绝缘子串单元。对于在污染非常严重的地区以及其他特殊或极端环境条件下使用的绝缘子，可能需要改变某些尺寸，并且可能优选具有不同爬电距离、间距和形式的绝缘子单元（例如，扁平型、半球形等）。直流系统使用的绝缘子也可能需要不同的尺寸。无论如何，本文件标准化的机械特性和连接尺寸应保持不变。 本文件的目的是规定帽针式绝缘子串单元的机械特性和主要尺寸的指定值。 本文件未规定绝缘子串单元的工频、雷电冲击和击穿耐受电压。IEC 60383-1给出了定义绝缘子串单元的电气特性；其值由买方和制造商协商确定。 球窝连接由IEC 60120覆盖，叉舌连接由IEC 60471覆盖。 注：关于现场污染等级的定义，请参见IEC TS 60815-1。 [外文原描述]： IEC 60305:2021 applies to string insulator units of the cap and pin type with insulating parts of ceramic material or glass, intended for AC overhead lines with a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz. It also applies to insulators of similar design used in substations. This document applies to string insulator units of the cap and pin type either with ball and socket couplings or with clevis and tongue couplings. This document applies to string insulator units for use on overhead lines in clean areas and polluted areas. For use in areas characterized by very heavy pollution levels and for other particular or extreme environmental conditions, it may be necessary for certain dimensions to be changed and insulator units having different creepage distances, spacing and forms may be preferred (for example, flat profile, hemispherical etc.). Insulators for use on DC systems may also need different dimensions. In any case, it is applicable that the standardized mechanical characteristics of this document and coupling sizes are retained. This fifth edition cancels and replaces the fourth edition published in 1995. This edition includes the following significant technical changes with respect to the previous edition: - wording in Scope changed from "it is recommended" to "it is applicable"; - new normative references added; - electromechanical or mechanical failing load in Clause 4 specified; - new figures added showing profiles.