| Application: | Overhead |
|---|---|
| Voltage: | Low and Medium Voltage Cable |
| Current: | DC & AC |
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High Temperature Low Sag Conductors (HTLS) can withstand operating temperatures of up to 210°C, thus carrying higher power compared to conventional conductors. These conductors can be applied when there is a need to use an existing OHL that has clearance problems (ampacity limitations) and restrictions to the use of new and higher towers. HTLS conductors will allow an increase of the ampacity without the need to modify most of the existing towers.
HTLS conductors can be one of four types [11]:
The aluminium alloy or annealed aluminium will give the conductor the characteristics to withstand high temperatures without losing mechanical properties. The special core will give the low sag characteristics due to low coefficient of thermal expansion (CTE) and high Young modulus.
The cost and thermal losses of HTLS conductors are typically higher than conventional conductors. The main advantage is that HTLS conductors can enhance security reserves and transmission capacity without impacting the negotiated right-of-way, ideally with minor modifications of towers (mostly clamps of the conductors and their mountings or light tower's reinforcement) and sometimes fewer towers. Although existing corridors are used, in some countries such projects have to go through an authorisation or impact assessment procedure again, especially when magnetic field levels are increased, as the expected currents are higher.
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