Difference between revisions of "Projects:2021s1-13005 Determining Dynamic Line Ratings of Over-Head Transmission Conductors based on Line Tension"
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== Thermal Factors == | == Thermal Factors == | ||
| − | [[File:Overhead Conductor Heat Balance ENetProj2021.png|frame|left|baseline|upright | + | [[File:Overhead Conductor Heat Balance ENetProj2021.png|frame|left|baseline|upright|The various effects of heating and cooling on an overhead conductor.]] |
There are four main factors when considering the various thermal effects on an overhead conductor. These are:<br> | There are four main factors when considering the various thermal effects on an overhead conductor. These are:<br> | ||
* [https://en.wikipedia.org/wiki/Joule_heating Current Heating] - Due to resistive and magnetic losses of the conductor material while it is conducting current. The resistive losses are due to both the conducting material and the increase in the resistance of the conductive material as its temperature increases. | * [https://en.wikipedia.org/wiki/Joule_heating Current Heating] - Due to resistive and magnetic losses of the conductor material while it is conducting current. The resistive losses are due to both the conducting material and the increase in the resistance of the conductive material as its temperature increases. | ||
Revision as of 11:59, 23 March 2021
Project Team Members
- Andrew Gross
- Michael Iuliano
- Taimur Abdullah Said Al-Sanaidi
Staff
Principal Supervisor: Associate Professor Wen Soong
Co-Supervisor: Research Officer David Vowles
ElectraNet Sponsors:
Abstract
This project sponsored by ElectraNet aims to develop a tension-based model to dynamically alter line ratings on transmission lines. This will allow for existing infrastructure to have a longer lifespan.
Introduction
The 2021 iteration of this project continues on from the work completed in the project of the same nameTemplate:Cn 2020 by Adrian Barone and James Smithson.
Thermal Factors
The various effects of heating and cooling on an overhead conductor.
There are four main factors when considering the various thermal effects on an overhead conductor. These are:
- Current Heating - Due to resistive and magnetic losses of the conductor material while it is conducting current. The resistive losses are due to both the conducting material and the increase in the resistance of the conductive material as its temperature increases.
- Solar Heating - This is heating due to direct radiation from the sun. Typically, direct solar radiation is difficult to calculate as direct and diffuse solar radiation has various challenges in measuring it (expensive for sensors, need regular attention). In some cases where this data isn’t available, global solar radiation is used.
- Convective Cooling - Convective Cooling occurs per the effect of the air surrounding the conductor heating, reducing the density of the air around the conductor causing cooler air replaces it.
- Radiative Cooling - This is the effect of the material emitting thermal radiation, losing heat in the process. A simplified equation is used as the radiation loss is a small fraction of the total cooling.
We do not consider Corona Heating or Evaporative Cooling as these are unlikely to occur under typical operation of the conductor.
