标准摘要
[中文适用范围]： 本文档规定了一种通过计算验证低压开关设备和控制设备成套装置温升的方法。该方法适用于无强制通风的封闭式成套装置或其分区段。当IEC 61439系列的相关产品标准已规定温升验证方法时，不适用此方法。注1：通常用于外壳的材料和壁厚对稳态温度有一定影响，但本报告采用的通用方法确保其适用于由钢板、铝板、铸铁、绝缘材料等制成外壳。拟议的方法旨在确定外壳内部空气的温升。注2：外壳内的空气温度等于外壳外的环境温度加上由安装设备的功率损耗引起的内部空气温升。除非另有规定，成套装置外部的环境空气温度是指安装地点（24小时平均值）为35°C的空气温度。如果成套装置使用地点的外部环境空气温度超过35°C，则将该较高温度视为环境空气温度。 [外文原描述]： IEC TR 60890:2014 specifies a method of temperature-rise verification of low-voltage switchgear and controlgear ASSEMBLIES by calculation. The method is applicable to enclosed ASSEMBLIES or partitioned sections of ASSEMBLIES without forced ventilation. It is not applicable where temperature rise verification to the relevant product standard of the IEC 61439 series has been established. This second edition cancels and replaces the first edition published in 1987 and its Amendment 1:1995. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the last edition: - alignment with IEC 61439-1:2011; - revision of Annex B; - general editorial review.
英文名称A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation