用于污秽条件下的高压绝缘子的选择和尺寸确定 第3部分：交流系统用复合绝缘子

[中文适用范围]： IEC TS 60815-3:2025 是一项技术规范，适用于交流系统中聚合物绝缘子的选择及其相关尺寸的确定，供在污染环境下使用的高压系统使用。本规范仅适用于户外安装的绝缘子。本文件提供了具体的指南和原则，以帮助判断某种绝缘子在特定污染环境中的可能行为。本文件内容基于CIGRE TB 158和CIGRE TB 361，这两份文件对于希望深入了解绝缘子在污染环境下性能的读者，是一份有用的补充材料。本文件不涉及雪或冰对污染绝缘子的影响。尽管CIGRE TB 158对此有所涉及，但目前相关知识非常有限，实践也过于多样。本文件的目的是为用户提供以下手段：- 根据现场污染严重程度（SPS）的值或等级确定参考统一特定爬电距离（RUSCD）；- 选择适当的绝缘子轮廓；- 对RUSCD应用海拔、绝缘子形状、尺寸和位置等因素的修正系数等。IEC TS 60815-3的第二版与IEC TS 60815-1一起，废止并取代了IEC TS 60815-3:2008的第一版。本版为技术修订版。与前一版相比，本版包括以下重大技术变更：a) 术语和定义在本文档中进行了修改或引入；b) 从参考绝缘子的RUSCD到候选绝缘子的USCD，引入并修订了修正系数，如海拔修正、直径修正、伞裙轮廓修正和- 平行绝缘子数量修正；d) 对材料的总体指导进行了修订。引入了疏水性转移和疏水性转移材料（HTM）的概念，认识到对于HTM绝缘子，可以使用较小的爬电距离。 [外文原描述]： IEC TS 60815-3:2025, which is a technical specification, is applicable for the selection of polymeric insulators for AC systems, and the determination of their relevant dimensions, to be used in high voltage systems with respect to pollution. The specification applies to insulators for outdoor installation only. This document gives specific guidelines and principles to arrive at an informed judgement on the probable behaviour of a given insulator in certain pollution environment. The contents of this document are based on CIGRE TB 158 and CIGRE TB 361, which form a useful complement to this document for those wishing to study in greater depth the performance of insulators under pollution. This document does not deal with the effects of snow or ice on polluted insulators. Although this subject is dealt with by CIGRE TB 158, current knowledge is very limited and practice is too diverse. The objective of this document is to give the user means to - determine the reference unified specific creepage distance (RUSCD) from site pollution severity (SPS) value or class, - choose appropriate profiles, - apply correction factors for altitude, insulator shape, size and position, etc. to the RUSCD. This second edition of IEC TS 60815-3, together with IEC TS 60815-1, cancels and replaces the first edition of IEC TS 60815-3:2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Terms and definitions are modified or introduced in this document; b) From RUSCD of reference insulator to USCD of candidate insulator, the correction factors are introduced and revised, such as altitude correction, diameter correction, shed profile correction and - parallel insulator number correction; d) The general guidance on materials is revised. The concept of hydrophobicity transfer and hydrophobicity transfer material (HTM) are introduced, recognising that a reduced creepage distance may be used for HTM insulators.