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.
Technology Types
HTLS conductors can be one of four types [11]:
- Type 0: Conventional steel core reinforced aluminium conductors ACSR or ACSR/TW for operating temperatures <100°C
- Type 1: Conductors consisting of a strength member made of steel, coated steel or steel alloy, and an envelope for which the high temperature effects are mitigated by means of thermal-resistant aluminium alloys (TACIR, TACSR)
- Type 2: Conductors consisting of a strength member made of steel, coated steel or steel alloy, and an envelope for which the high temperature effects are mitigated by means of annealed aluminium (ACSS)
- Type 3: Conductors consisting of a metal-matrix composite (MMC) strength member, and an envelope for which the high temperature effects are mitigated by means of thermal-resistant aluminium alloys or annealed aluminium. (ACCR, ACMR)
- Type 4: Conductors consisting of a polymer-matrix composite (PMC) strength member, and an envelope for which the high temperature effects are mitigated by means of annealed aluminium or thermal- resistant aluminium alloys for HTLS applications (ACPR)
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.
Certificate
Shanghai Qifan Cable Co., Ltd. has strong technical , advanced production equipment, complete testing equipment, reliable product quality and excellent after-sales service. The products are produced in strict accordance with GB, ICE, BS and other standards. It has passed ISO9001-2008 quality system certification, 14001-2004 environmental system certification, 28001-2001 occupational health and safety management system certification, national compulsory CCC certification, and obtained a national industrial product production license. Over the years, it has passed the inspections of national, provincial and municipal quality supervision departments many times. In 2022, it was recognized as a Top 100 Private Manufacturing Enterprises in Shanghai
The "Aluminium Alloy Conductor Aluminium Clad Invar Steel Reinforced (AACSR) HTLS Conductor" is a specific type of overhead conductor used for power transmission and distribution.
Aluminium Alloy Conductor: The conductor is primarily made of aluminum alloy, which provides good conductivity and mechanical strength. The aluminum alloy strands carry the electrical current.
Aluminium Clad Invar Steel Reinforced: In this conductor, the aluminum alloy strands are reinforced with a layer of aluminum-clad Invar steel. Invar is a nickel-iron alloy known for its low coefficient of thermal expansion, which helps to reduce conductor sag under high-temperature conditions. The steel reinforcement enhances the mechanical strength of the conductor.
