bedrijfsnieuws over What Causes Unstable Tension During Overhead Conductor Stringing Operations?

Unstable tension is one of the most frustrating problems in overhead conductor stringing. It shows up as erratic payout, conductor slap, sagging spans and, in the worst cases, conductor damage. The good news is that unstable tension almost always traces back to a small number of identifiable causes — and each has a practical solution. This article follows a simple problem → cause → solution structure.

Cause 1: Terrain Changes

Cause: As the conductor climbs a steep span or drops into a valley, the effective load on the tensioner changes abruptly.

Solution: Anticipate the gradient changes along the section and prepare the operator to adjust tension smoothly rather than in sudden steps.

Cause 2: Friction

Cause: Every stringing block, corner tower and running board adds friction, and friction that varies along the pull makes the tension wander.

Solution: Keep blocks clean and correctly aligned, minimise needless angle changes, and use the right number of blocks for the section.

Cause 3: Unexpected Loads

Cause: A conductor snagging on vegetation, a rock or a temporary obstruction suddenly spikes the load, and the tension control struggles to keep up.

Solution: Use a machine with responsive load sensing, and keep the right-of-way clear so surprises are rare.

Cause 4: Incorrect Equipment Matching

Cause: A tensioner that is too small for the conductor, or a puller and tensioner of mismatched class, cannot hold steady back-tension.

Solution: Size the puller and tensioner as a matched pair for the specific conductor, bundle and section length.

Cause 5: Speed and Tension Adjustment

Cause: Running the pull too fast, or adjusting tension by feel, produces oscillation instead of steady control.

Solution: Run at a sustainable speed and use the machine's tension-control system to hold a set value rather than chasing it manually.

How Modern Pre-Set Pull Control Helps

Some hydraulic pullers address the problem directly with an automatic pull pre-setting system. Rather than waiting for the operator to react, the system monitors friction and unexpected loads and automatically adjusts the running speed to keep the pull within a safe, stable band. On a 220 kN class machine such as the GS220, this kind of control reduces the sharp load swings that cause tension instability — it is a structural design feature, not a marketing claim, and it is exactly the kind of capability that pays off on real, uneven routes.

The Takeaway

Stable tension is the product of good preparation and well-matched equipment: know your terrain, manage friction, keep the corridor clear, match the machines, and use responsive control. When those five are handled, the erratic payout that plagues so many projects largely disappears.