标称电压高于1000V的架空线路用绝缘子.交流系统用陶瓷或玻璃绝缘子单元.帽销式绝缘子单元的特性

[中文适用范围]： 本国际标准适用于帽型和针型绝缘子串单元，其绝缘部件由陶瓷材料或玻璃制成，适用于标称电压大于1000V且频率不大于100Hz的交流架空线路。它也适用于变电站中使用的类似设计的绝缘子。 本文件适用于帽型和针型绝缘子串单元，无论是球窝连接还是挂钩和舌片连接。 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。对于在非常严重污染区域和其他特殊或极端环境条件下使用，可能需要改变某些尺寸，并且可能需要具有不同爬电距离、间距和形状的绝缘子单元（例如，扁平型、半球形等）。用于直流系统的绝缘子也可能需要不同的尺寸。无论如何，本文件规定的标准化机械特性和连接尺寸应保持不变。 本文件的目的是规定帽型和针型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特性；其值由买方和制造商商定。 球窝连接由IEC 60120覆盖，挂钩和舌片连接由IEC 60471覆盖。 注：关于现场污染严重程度的定义，请参见IEC TS 60815-1。 [外文原描述]： IEC 60305:2021 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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.