Pulling tension is a crucial parameter in overhead conductor pulling, directly impacting conductor integrity, sag, and tower stress. Several critical factors influence it:

• Conductor Weight and Type: Heavier conductors (e.g., large-diameter ACSR, bundled conductors) naturally require higher pulling forces. New-generation conductors like HTLS or ACCC, while strong, may have specific tension limits or sensitivities to over-tensioning.

• Span Length and Number of Spans: Longer spans and a greater number of consecutive spans in a pull increase the cumulative weight and friction, thus demanding higher pulling tension.

• Terrain and Elevation Changes: Pulling uphill or across varying elevations adds to the resistance, requiring more pulling force.

• Stringing Block Friction: The efficiency and condition of stringing blocks (sheaves) are paramount. Worn bearings, small diameters, or improper lining can significantly increase friction and, consequently, pulling tension. Our modern stringing blocks feature sealed, high-quality bearings and optimized groove designs to minimize friction.

• Bending Angles at Structures: Sharp angles in the line path (e.g., angle towers) create increased sidewall pressure and friction on the conductor within the stringing blocks, leading to higher pulling tension.

• Environmental Conditions:

  • Temperature: Affects conductor sag and tension, requiring adjustments.

  • Wind and Ice: Can add significant load, though pulling typically occurs in fair weather.

  • Lubrication: Proper conductor pulling lubricants (for certain types of pulling operations, not direct conductor surface) can reduce friction in specialized cases, though tension stringing primarily relies on frictionless rollers.

How Modern Pullers Manage Variations:

Our state-of-the-art hydraulic pulling machines are engineered to precisely manage these variations:

• Closed-Loop Hydraulic Systems: Provide infinitely variable speed and pulling force control, allowing operators to make instant, smooth adjustments in response to changing conditions, maintaining a consistent and optimal tension.

• Real-time Load Cells & Digital Displays: Integrated load cells provide continuous, accurate readings of pulling force and tension, displayed digitally to the operator. This real-time feedback is critical for staying within specified limits and preventing overstressing the conductor.

• Automated Overload Protection: Our pullers are equipped with automatic shutdown or slowdown mechanisms that activate if pre-set maximum pulling force limits are exceeded, safeguarding both the conductor and the equipment.

• Data Logging: Modern pullers log all operational data, providing a complete record of tension, speed, and distance for quality assurance, post-project analysis, and troubleshooting.

By providing equipment with such advanced capabilities, we ensure that your overhead conductor pulling operations are conducted with maximum precision, safety, and efficiency, regardless of the challenging factors encountered