用于污秽条件下的高压绝缘子的选择和尺寸确定 第2部分：交流系统用陶瓷和玻璃绝缘子

[中文适用范围]： IEC TS 60815-2:2025 是一份技术规范，适用于交流系统中陶瓷和玻璃绝缘子的选择，以及在污染环境下高压系统中使用时相关尺寸的确定。本文件仅适用于户外安装的绝缘子。本文件提供了具体的指导原则，以便对特定绝缘子在特定污染环境中的可能行为做出合理的判断。本文件的结构和方法论的基础已在IEC TS 60815-1中得到完整解释。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）值或等级确定参考统一特定爬电距离（RUSCD）； - 评估不同绝缘子轮廓的适用性； - 通过应用对绝缘子形状、尺寸、位置等的修正因素，确定所需的USCD； - 如有必要，确定适当的测试方法和参数以验证所选绝缘子的性能。 IEC TS 60815-2第二版与IEC TS 60815-1一起，取代并废止了2008年发布的IEC TS 60815-2第一版。本版构成技术修订。与前一版相比，本版包括以下重大技术变更： a) 本文档中修改或引入了一些术语和定义，如USCD（统一特定爬电距离）、标称爬电距离、RUSCD（参考统一特定爬电距离）、爬电系数、绝缘子主体等； b) 从参考绝缘子的RUSCD到候选绝缘子的USCD，引入并修订了修正因子，例如海拔修正、直径修正、伞裙轮廓修正和平行绝缘子数量修正； c) 对陶瓷和玻璃绝缘子的轮廓适用性进行了简化。 [外文原描述]： IEC TS 60815-2:2025, which is a technical specification, is applicable for the selection of ceramic and glass insulators for AC systems, and the determination of their relevant dimensions, to be used in high-voltage systems with respect to pollution. This document 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 environments. The basis for the structure and approach of this document is fully explained in IEC TS 60815­-1. 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; - evaluate the suitability of different insulator profiles; - determine the necessary USCD by applying corrections for insulator shape, size, position, etc. to the RUSCD; - if required, determine the appropriate test methods and parameters to verify the performance of the selected insulators. This second edition of IEC TS 60815-2, together with IEC TS 60815-1, cancels and replaces the first edition of IEC TS 60815-2 published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Some terms and definitions are modified or introduced in this document, such as USCD, nominal creepage distance, RUSCD, creepage factor, insulator trunk, etc.; 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; c) Profile suitability on ceramic and glass insulators was simplified.