Enhancing The Resilience Of Transmission Lines: The Mechanical Performance Of Pre-stranded Wire In Micro-wind Vibration Protection

The operating environment of power distribution networks is complex and variable. Conductors are constantly exposed to nature and subjected to wind-induced vibrations. This periodic alternating stress easily causes fatigue damage at suspension points or clamping areas, leading to fatigue fracture of aluminum strands and even large-scale power outages.

How Prestressed Wire Distributes Static and Dynamic Stress

Line support points are often the weakest points where stress is most concentrated. By winding armour rod with a specific helical structure around the outer layer of the conductor, the cross-sectional area and stiffness of the local area can be significantly increased. This design distributes the concentrated load, originally borne by a single suspension point, evenly over a longer conductor section, significantly reducing the radial pressure at the suspension point.

Technical Path to Suppress Alternating Stress

Bending stress generated by wind vibration is a major cause of metal fatigue. armour rod in transmission line, with its excellent elastic modulus and damping characteristics, can generate internal friction to dissipate energy when the conductor undergoes high-frequency, small-amplitude oscillations. This energy dissipation mechanism reduces the relative displacement between strands, allowing the conductor to maintain structural integrity during long-term operation.

• Load Sharing: The helical structure shares the axial tensile force of the conductor.

• Wear Protection: The outer, tightly secured layer reduces conductor erosion caused by wind-induced vibration friction.

• Stress Reduction: A smooth transition area eliminates stress concentration issues associated with traditional rigid clamps.

Enhanced System Stability in Long-Span Sections

In long-span sections across rivers, lakes, or valleys, wind speed distribution is uneven and intensity is high. For these high-risk areas, an extended armor rods conductor clamp combined with a vibration damper creates a dual-protection system. The spiral gripping force remains stable under varying high and low temperatures, maintaining the overall fatigue strength of the line and extending the service life of power facilities.