IEC 60287-2-1 Edition 1.2-2006 电缆.额定电流的计算.第2-1部分_热阻.热阻计算.pdf

标准号：IEC 60287-2-1 Edition 1.2-2006
实施状态：作废
中文名称：电缆.额定电流的计算.第2-1部分:热阻.热阻计算
英文名称：Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
发布日期：2006-05
被替代标准：IEC 60287-2-1-2015
代替标准：IEC 60287-2-1 Edition 1.1-2001
起草单位：IEC/SC 20A
标准简介：This section of IEC 60287 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 section provides formulae for thermal resistance.
The formulae given are essentially literal and designedly leave open the selection of certain
important parameters. These may be divided into three groups:
– parameters related to construction of a cable (for example, thermal resistivity of insulating
material) for which representative values have been selected based on published work;
– parameters related to the surrounding conditions which may vary widely, the selection of
which depends on the country in which the cables are used or are to be used;
– parameters which result from an agreement between manufacturer and user and which
involve a margin for security of service (for example, maximum conductor temperature).
文件格式：PDF
文件大小：1.69MB
文件页数：88
（以上信息更新时间为：2019-11-25）



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