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IEEE 738-2012

Historical Revision

IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors

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Revision Standard - Inactive-Reserved. A method of calculating the current-temperature relationship of bare overhead lines, given the weather conditions, is presented. Along with a mathematical method, sources of the values to be used in the calculation are indicated. This standard does not undertake to list actual temperature-ampacity relationships for a large number of conductors nor does it recommend appropriately conservative weather conditions for the rating of overhead power lines. It does, however, provide a standard method for doing such calculations for both constant and variable conductor current and weather conditions.
The standard describes a numerical method by which the core and surface temperatures of a bare stranded overhead conductor are related to the steady or time-varying electrical current and weather conditions. The method may also be used to determine the conductor current that corresponds to conductor temperature limits. The standard does not recommend suitable weather conditions or conductor parameters for use in line rating calculations.
The purpose of the standard is to provide a well-documented method by which the temperatures, steady-state, transient, and real-time thermal ratings of overhead power line conductors can be calculated given suitable weather, conductor parameters, and (for ratings) maximum conductor temperatures.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number 738
Publication Date Dec. 23, 2013
Language en - English
Page Count 72
Revision Level
Supercedes
Committee Transmission and Distribution
Publish Date Document Id Type View
Dec. 19, 2023 738-2023 Revision
Dec. 23, 2013 738-2012 Revision
Jan. 30, 2007 738-2006 Revision
Dec. 31, 1985 738-1986 Revision