IEC 60287-2-1:2015 电缆 - 电流额定值的计算第2-1部分:热阻 - 热阻的计算

标准编号：IEC 60287-2-1:2015

中文名称：电缆 - 电流额定值的计算第2-1部分:热阻 - 热阻的计算

英文名称：Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of the thermal resistance

发布日期：2015-04-09

标准范围

IEC 60287-2-1:20 15作为IEC标准+60287-2-1:20 15提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60287-2-1:20 15仅适用于电缆在所有交流电压和高达5 kV的直流电压下的稳态运行条件，直接埋在地下、管道、槽或钢管中，土壤部分干燥和不干燥，以及空气中的电缆。术语“稳态”旨在表示仅足以渐近地产生最大导体温度的连续恒定电流(100%负载因子)，假设周围环境条件恒定。IEC 60287的这一部分提供了热阻公式。IEC 60287-2-1的第二版取消并取代了1994年出版的第一版，修订1:20 01、修订2:20 06和修订1:20 08。与上一版相比，此版本包括以下重大技术变更:a)列入关于在没有分析方法可用于计算外部热阻的情况下使用有限元方法的参考资料；b)关于SL和SA型电缆的说明；c)具有挤压绝缘和每个芯上单独铜带屏蔽的无铠装三芯电缆的T3计算方法；d)5.4中X的条件变化；e)表4中包含充水管道的常数或安装条件。

IEC 60287-2-1:2015 is available as IEC Standards+ 60287-2-1:2015 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60287-2-1:2015 is solely applicable to the conditions of steady-state operation of cables at all alternating voltages, and direct voltages up to 5 kV, buried directly in the ground, in ducts, in 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 part of IEC 60287 provides formulae for thermal resistance. This second edition of IEC 60287-2-1 cancels and replaces the first edition, published in 1994, Amendment 1:2001, Amendment 2:2006 and Corrigendum 1:2008. This edition includes the following significant technical changes with respect to the previous edition:
a) inclusion of a reference to the use of finite element methods where analytical methods are not available for the calculation of external thermal resistance;
b) explanation about SL and SA type cables;
c) calculation method for T3 for unarmoured three-core cables with extruded insulation and individual copper tape screens on each core;
d) change of condition for X in 5.4;
e) inclusion of constants or installation conditions for water filled ducts in Table 4.

标准预览图