IEC 60287-2-1:2006
电缆.额定电流的计算.第2-1部分:热阻.热阻计算

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

被代替

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标准号

IEC 60287-2-1:2006

发布

2006年

发布单位

国际电工委员会

替代标准

IEC 60287-2-1:1994/AMD2:2006

当前最新

IEC 60287-2-1:2023

 

 

被代替标准

IEC 60287-2-1 Edition 1.1:2001

适用范围

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).

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