IEC 60287-2-1:2015
Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance

Standard No.
IEC 60287-2-1:2015
Release Date
2015
Published By
International Electrotechnical Commission (IEC)
Status
Replace By
IEC 60287-2-1:2023 CMV
Latest
IEC 60287-2-1:2023 CMV
Replace
IEC 20/1561/FDIS:2015 IEC 60287-2-1:1994 IEC 60287-2-1 AMD 1:2001 IEC 60287-2-1 AMD 2:2006 IEC 60287-2-1 AMD 2 Corrigendum 1:2008 IEC 60287-2-1 Edition 1.1:2001 IEC 60287-2-1 Edition 1.2:2006
Scope
"This part 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 part of IEC 60287 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: ?C 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; ?C 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; ?C parameters which result from an agreement between manufacturer and user and which involve a margin for security of service (for example@ maximum conductor temperature). Equations given in this part of IEC 60287 for calculating the external thermal resistance of a cable buried directly in the ground or in a buried duct are for a limited number of installation conditions. Where analytical methods are not available for calculation of external thermal resistance finite element methods may be used. Guidance on the use of finite element methods for calculating cable current ratings is given in IEC TR 62095."

IEC 60287-2-1:2015 Referenced Document

  • IEC 60287-1-1:2006 Electric cables - Calculation of the current rating - Part 1-1: Current rating equations (100 % load factor) and calculation of losses - General
  • IEC 60853-2:1989 Calculation of the cyclic and emergency current rating of cables; part 2: cyclic rating of cables greater than 18/30 (36) kV and emergency ratings for cables of all voltages

IEC 60287-2-1:2015 history

  • 0000 IEC 60287-2-1:2023 CMV
  • 0000 IEC 60287-2-1:2015 RLV
  • 2008 IEC 60287-2-1:1994/AMD2:2006/COR1:2008 Corrigendum 1 - Amendment 2 - Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of the thermal resistance
  • 2006 IEC 60287-2-1:1994/AMD2:2006 Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance; Amendment 2
  • 2006 IEC 60287-2-1:2006 Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
  • 2001 IEC 60287-2-1:1994/AMD1:2001 Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance; Calculation of thermal resistance; Amendment 1
  • 2001 IEC 60287-2-1:2001 Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance; Calculation of thermal resistance
  • 1994 IEC 60287-2-1:1994 Electric cables - Calculation of the current rating - Part 2: Thermal resistance; section 1: Calculation of thermal resistance
Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance



Copyright ©2024 All Rights Reserved