高压开关设备和控制设备第304部分:与冷凝和污染相关的特殊使用条件下使用的额定电压1kV及以下52kV室内封闭开关设备和控制设备的分类

[中文适用范围]： 该部分IEC 62271技术规格适用于符合IEC 62271-200和IEC 62271-201的户内封闭开关设备和控制设备，其旨在用于关于结露和污染的特殊服务条件，这些条件偏离了IEC 62271-1中规定的正常服务条件。本文件详述的测试主要用于对暴露于户内服务条件（主要是结露）的高压电气绝缘设备的电气绝缘性能进行分类。同时也考虑了对机械部件（如机构、联锁装置和外壳）的评估。在本文件中，“设备”一词的使用符合“封闭的开关设备和控制设备组合”的范围定义。 [外文原描述]： IEC TS 62271-304:2019 applies to indoor enclosed switchgear and controlgear complying with IEC 62271-200 and IEC 62271-201, intended to be used in special service conditions with respect to condensation and pollution deviating from the normal service conditions specified in IEC 62271-1. The test detailed in this document has been designed primarily to classify the electrical insulation performance of equipment having high-voltage electrical insulation exposed to indoor service conditions, mainly in presence of condensation. The assessment of mechanical components, such as mechanisms, interlocks and enclosure is also considered. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the description of the several service conditions under condensation and pollution; b) the classification of enclosed switchgear and controlgear, according to the testing procedure does not cover polluted service conditions PL and PH; c) a wider description in Annex B of typical indoor environments based on ISO/IEC standards; d) a new Annex C giving guidance on precautions to improve indoor operating conditions; e) a new Annex D dedicated to the optional items such as records of mechanical characteristics; f) a new Annex E, giving additional combinations of environments with condensation and pollution, as well as a proposal of testing procedure of ageing test, is provided to create experience on correlation between ageing effects in laboratory and ageing effects at site conditions.