Case Study: Precision Reconductoring in Europe

Upgrading a 220kV Line with HTLS Conductors Using Our Hydraulic OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioner

The Client: A leading power grid contractor in Central Europe.

The Challenge: The client was tasked with upgrading a 24-kilometer, 220kV double-circuit line, a critical artery for a major metropolitan area. To increase capacity without building new towers, they chose to reconductor using HTLS (High-Temperature Low-Sag) conductors. HTLS conductors, particularly composite core types (ACCC/ACSS), are highly sensitive to improper bending, torsion, or over-tensioning. The project required a flawless pull with zero conductor damage, including several spans crossing active highways and railways.

The Solution: The contractor consulted Ningbo Changshi to source a complete stringing solution. The core of the project relied on our SA-YQZ220 Hydraulic Puller-OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioner. This machine was chosen for its advanced features:

• Precision Tension Control: The machine's digital controls allow for a maximum tension to be set. It automatically self-adjusts to maintain a perfectly smooth and constant tension, eliminating the "jerking" that can damage a composite core.

• High-Capacity Bull-Wheels: The large-diameter, nylon-lined bull-wheels provided the necessary grip without compressing or damaging the conductor's sensitive outer layers.

• Matched Stringing Blocks: We provided a full set of large-diameter, helicopter-compatible Stringing Blocks (conductor pulleys) to ensure the conductor's minimum bending radius was respected at all times.

The Execution: The contractor set up the SA-YQZ220 tensioner at one end and our SA-YQ220 hydraulic puller at the other. Over the critical highway and railway crossings, advanced guard structures (scaffolding and nets) were used. Our equipment's smooth operation was paramount. The remote-control feature allowed the operator to have a clear view of the pull, stopping immediately if any issues were spotted, while the tensioner's automatic brakes held the conductor securely in place.

The Results: The 24-km reconductoring project was completed 15% ahead of schedule. Post-stringing inspections (including visual and drone-based) showed zero damage to the expensive HTLS conductor. The utility was able to energize the upgraded line immediately, successfully doubling the grid's capacity for the region. The contractor has since designated our puller-tensioners as their standard for all future HTLS projects.

Need precision equipment for your next reconductoring project? Contact us today.