IEC 60287-1-1 Ed. 2.0现行
Electric cables - Calculation of the current rating Part 1-1: Current rating equations (100 % load factor) and calculation of losses - General
出版：International Electrotechnical Committee
专家解读视频
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, 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. Provides formulae for current ratings and losses. 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 temperatur
BS 7769-1.1:1997 - Equivalent
NEN 10287-1-1:1995 - Identical
UNE 21144-1-1:1997 (R2011) - Identical
CEI 20-21/1-1 Ed. 3 (2007) - Identical
BS IEC 60287-1-1:2006 - Identical
NEN IEC 60287-1-1:2007 - Identical
