Line Rate Pro



This subscription application provides short time rating calculations for a variety of common overhead conductors. The resulting ampere ratings are tabulated for a variety of initial line loading conditions. Each rating is calculated from the input parameters defined below. It should be noted that the wind speed and direction represent the average wind speed vector observed over the last 10 (or more) minutes.


The application of short-time ratings can increase the utilisation of your network and facilitate the deferral of capital expenditure through the use of post-contingent load transfers.



Input Parameters

Calculation Methodology
Conductor Type (a limited selection)
Line Design Temperature (Deg C)
Ambient Temperature (Deg C)
Wind Speed (m/s)
Wind Angle (Deg relative to conductor)
Line Voltage(kV. Line to Line)
Line Azimuth(Deg from North)
Number of days since 1st Jan
Time of Day(hours since midnight)
Time Zone(GMT+)
Line Latitude(Deg)
Line Longitude(Deg)
Conductor Emissivity (see Note)
Conductor Absorptivity (see Note)
Conductor Albedo
Conductors per phase

Note on the emissivity and absorptivity: Guidance is provided in various texts, including [2], [6] and [7]

Terms of Use

This package is intended to provide assistance with common overhead line rating calculations. Before using this tool, you must understand that we are not providing advice and the results should be used for indicative purposes only. In performing the calculation, you are agreeing not to hold WeatheRate (or any of its associates) responsible for any liability, loss or harm associated with the use of this site's contents.



Calculation Results







References

[1] ESAA publication D(b)5:1988 - Current rating of bare overhead conductors.
[2] TNSP Co-operative Charter Plant Rating Working Group. (2009). TNSP Operational Line Ratings.
[3] AS 1531—1991, Conductors—Bare overhead—Aluminium and aluminium alloy
[4] AS 1746—1991, Conductors—Bare overhead— Hard-drawn copper
[5] AS 3607—1989, Conductors—Bare overhead,aluminium and aluminium alloy—Steel reinforced
[6] Thermal Behaviour Of Overhead Conductors', CIGRE Working Group 22.12, paper 207, 2002
[7] V. T. Morgan, The thermal rating of overhead-line conductors, Part I. The steady-state thermal model, Electr. Power Syst. Res., pp. 119 – 139, 1982.