IEEE 738-2012
$70.96
IEEE Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors
| Published By | Publication Date | Number of Pages |
| IEEE | 2012 | 72 |
Revision Standard – Active. 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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std 738™-2012 front cover |
| 3 | Title page |
| 5 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 8 | Participants |
| 12 | Introduction |
| 13 | Contents |
| 15 | IMPORTANT NOTICE 1. Overview 1.1 Scope 1.2 Disclaimer |
| 16 | 2. Definitions |
| 17 | 3. Units and identification of letter symbols |
| 19 | 4. Temperature calculation methods |
| 21 | 4.1 Steady-state case 4.1.1 Steady-state thermal rating 4.1.2 Steady-state conductor temperature for a given current and ambient temperature |
| 22 | 4.2 Transient calculations 4.2.1 Transient conductor temperature |
| 23 | 4.2.2 Transient thermal rating 4.2.3 Fault current calculations 4.3 Time-varying weather and current calculations |
| 24 | 4.4 Formulas 4.4.1 Steady-state heat balance 4.4.2 Non-steady-state heat balance 4.4.3 Convective heat loss |
| 25 | 4.4.3.1 Forced convection |
| 26 | 4.4.3.2 Natural convection 4.4.4 Radiated heat loss rate 4.4.5 Rate of solar heat gain |
| 27 | 4.4.6 Conductor electrical resistance ([B7] and [B17]) 4.4.6.1 Limitations of linear interpolation of AC resistance |
| 28 | 4.4.6.2 Skin effect component of AC resistance 4.4.6.3 Magnetic core effect on AC resistance 4.4.6.4 Radial thermal gradient component of AC/DC resistance |
| 29 | 4.4.7 Radial temperature gradient within the conductor ([B16] and [B27]) |
| 30 | 4.4.8 Conductor heat capacity |
| 31 | 4.5 Equations for air properties, solar angles, and solar heat flux 4.5.1 Dynamic viscosity of air (see also Table H.1) 4.5.2 Air density (see also Table H.1) 4.5.3 Thermal conductivity of air (see also Table H.1) |
| 32 | 4.5.4 Altitude of the sun (see also Table H.2) 4.5.5 Azimuth of the sun (see also Table H.2) |
| 33 | 4.5.6 Total heat flux density (heat intensity) at sea level versus Hc (see also Table H.3) 4.5.7 Elevation correction factor (see also Table H.4) |
| 34 | 4.6 Sample calculations 4.6.1 Steady-state thermal rating 4.6.1.1 Problem statement |
| 35 | 4.6.1.2 Air and conductor properties |
| 36 | 4.6.1.3 Radiated heat loss (qr) 4.6.1.4 Solar heat gain (qs) |
| 37 | 4.6.1.5 Resistance at 100 °C 4.6.1.6 Steady-state thermal rating |
| 38 | 4.6.1.7 Check radial temperature steady-state thermal rating 4.6.2 Steady-state conductor temperature 4.6.3 Transient conductor temperature |
| 40 | 4.6.4 Transient thermal ratings |
| 41 | 4.6.5 Thermal time constant 4.6.6 Time-varying conductor current and weather conditions. |
| 43 | 5. Input data 5.1 General |
| 44 | 5.2 Selection of air temperature and wind conditions for line ratings 5.3 Air density, viscosity, and conductivity |
| 45 | 5.4 Conductor emissivity and absorptivity 5.5 Solar heat gain |
| 46 | 5.6 Conductor heat capacity 5.7 Maximum allowable conductor temperature |
| 47 | 5.8 Time step |
| 48 | Annex A (informative) (“RATEIEEE” numerical method listing – SI units) flowchart of numerical method |
| 58 | Annex B (informative) Numerical example: steady-state conductor temperature calculation (SI units) |
| 59 | Annex C (informative) Numerical example: Steady-state thermal rating calculation (SI units) |
| 60 | Annex D (informative) Numerical calculation of transient conductor temperature |
| 62 | Annex E (informative) Numerical Calculation of Transient Thermal Rating |
| 63 | Annex F (informative) Conductor thermal time constant |
| 65 | Annex G (informative) Selection of weather conditions G.1 Base ratings |
| 66 | G.2 Study-based ratings G.3 Ambient-adjusted ratings G.4 Real-time ratings |
| 67 | Annex H (informative) Tables for solar heating and air properties |
| 71 | Annex I (informative) Bibliography |
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