标准摘要
[中文适用范围]： IEC 60287-3的这一部分适用于直接埋在地下、管道、槽或钢管中的电缆在所有电压下的稳态运行条件，无论土壤是否部分干燥，以及空气中的电缆。术语“稳态”旨在表示刚好足以渐进地产生最大导体温度的连续恒定电流（100%负载系数），假设周围环境条件恒定。本文件定义了现场参考条件，但一般值将被具体的国家要求所取代。 [外文原描述]： IEC 60287-3-1:2017 is applicable to the conditions of steady-state operation of cables at all voltages, buried directly in the ground, in ducts, troughs or in steel pipes, both with and without partial drying-out of the soil, as well as cables in air. The term "steady state" is intended to mean a continuous constant current (100 % load factor) just sufficient to produce asymptotically the maximum conductor temperature, the surrounding ambient conditions being assumed constant. This document defines site reference conditions, however the general values are superseded by specific national requirements. This edition includes the following significant technical changes with respect to the previous edition: - the updated list of national laying conditions is now covered in Annex A; - Clause 5 about the information required from the purchaser for the selection of the appropriate type of cable has been removed.
英文名称Electric cables - Calculation of the current rating - Part 3-1: Operating conditions - Site reference conditions