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.
- Standard Committee
- PE/T&D - Transmission and Distribution
- Status
- Inactive-Reserved Standard
- PAR Approval
- 2010-11-08
- Superseded by
- 738-2023
- Superseding
- 738-2006
- Corrigendum
-
738-2012/Cor 1-2013
- Board Approval
- 2012-10-19
- History
-
- Published:
- 2013-12-23
- Inactivated Date:
- 2023-03-30
Working Group Details
- Society
- IEEE Power and Energy Society
- Standard Committee
- PE/T&D - Transmission and Distribution
- Working Group
-
738_WG - Conductor Working Group P738
- IEEE Program Manager
- Michael Kipness
Contact Michael Kipness - Working Group Chair
- Cody Davis
Other Activities From This Working Group
Current projects that have been authorized by the IEEE SA Standards Board to develop a standard.
No Active Projects
Standards approved by the IEEE SA Standards Board that are within the 10-year lifecycle.
738-2023
IEEE Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors
A numerical method by which the core and surface temperatures of a bare overhead conductor are related to the steady or time-varying electrical current and weather conditions is described in this standard. Contents discussed also include how this method may be used to determine the conductor's current for a corresponding conductor temperature limit. Please note the content in this standard does not recommend suitable weather conditions or conductor parameters for use in line rating calculations.
These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.
738-1986
IEEE Standard for Calculation of Bare Overhead Conductor Temperature and Ampacity Under Steady-State Conditions
The purpose of this standard is to present a simplified method of calculating the current-temperature relationship of bare over-head lines when given the weather conditions.
These standards have been removed from active status through a ballot where the standard is made inactive as a consensus decision of a balloting group.
No Inactive-Withdrawn Standards
These standards are removed from active status through an administrative process for standards that have not undergone a revision process within 10 years.
738-2012/Cor 1-2013
IEEE Approved Draft Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors - Corrigendum 1
Technical corrections are addressed in this corrigendum. (NOTE: This corrigendum was not published as an individual standard. It was incorporated into IEEE Std 738-2012 at the time of publication)