As energy demand surges and acquiring new right-of-way (ROW) permits becomes increasingly difficult globally, power utilities are turning to High-Temperature Low-Sag (HTLS) conductors—such as ACCC (Aluminum Conductor Composite Core) and ACCR—to double the capacity of existing transmission corridors.

While HTLS conductors offer superior thermal capacity and minimal thermal sag, their carbon-fiber or composite cores are far more susceptible to mechanical shear, sharp bending, and excessive compressive clamping forces than conventional ACSR wires.

Crucial Stringing Equipment Considerations for HTLS Upgrades

1. Increased Sheave Wheel Diameter HTLS manufacturers mandate significantly larger minimum bending radii. Contractors must use large-diameter stringing blocks (typically 660mm to 1000mm or larger) to prevent micro-fracturing of the inner composite core as the wire travels through angle towers.

2. Elastomer/Rubber Groove Lining Unlined aluminum pulley grooves can notch soft outer trapezoidal aluminum strands. Stringing sheaves equipped with high-durability neoprene or polyurethane linings are essential to cushion the conductor under tension.

3. Ultra-Smooth Hydraulic Tensioning Abrupt tension changes or hydraulic surges during stringing can strain the composite core. Tensioners must feature continuous stepless speed-tension control and dynamic load cells to maintain smooth movement over long spans.

4. Self-Gripping Come-Along Clamps Standard conductor grips can crush composite core structures. Specialized snake-skin or extended-jaw self-gripping clamps distribute holding force evenly across outer aluminum wire layers.

At Ningbo Changshi Electric Power Machinery Manufacturing Limited, we manufacture fully certified HTLS-compatible stringing blocks, anti-twist steel wire ropes, and hydraulic puller-tensioners configured specifically to protect composite-core lines during reconductoring projects globally.