High Strength Yoke Plate

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High Strength Yoke Plate
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High strength yoke plates are high-end load-bearing connectors designed for high tension, high load, and extreme working conditions in power transmission lines. Through the selection of high-strength base materials, weld-free cold working integral molding, and enhanced anti-corrosion processes, the tensile strength of conventional yoke plates is improved. They are mainly suitable for the stringent stress requirements of power transmission projects such as high voltage, long spans, and strong winds. They are also core fittings for global power grid upgrades, power transmission of large-scale new energy power plants, and cross-mountain power transmission projects.
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Yoke Plate
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high strength yoke plate

 

High strength yoke plates typically refer to transmission line yoke plates with a tensile strength ≥80kN and an ultimate tensile strength ≥120kN. The difference between high-strength yoke plates and conventional yoke plates lies in their enhanced performance through upgraded base material, optimized structural design, and thickened plate body, achieving core properties such as resistance to high tension, dynamic impact, and deformation. The emergence of high strength yoke plates solves the pain points of yoke plates being prone to deformation, breakage, and short service life in high-voltage, high-tension, extreme natural environments, and multi-split conductor scenarios. Upgrades in manufacturing processes have resulted in improved performance: Enhanced load-bearing capacity: Capable of bearing the concentrated tension of ultra-high-voltage four-split and six-split conductors, meeting the load requirements of ultra-long-distance transmission over long spans; Environmental adaptability: Can be used in extreme conditions, especially in heavy icing areas, strong wind areas, and low-temperature and high-altitude areas, ensuring structural stability, no deformation, and no cracking; Extended service life: High-strength base material + reinforced hot-dip galvanized anti-corrosion ensures an outdoor service life of ≥20 years, significantly reducing maintenance costs under extreme conditions.

 

The selection of materials and international standards for high strength yoke plates vary, and matching needs to be based on the customer's target market when engaging in foreign trade. The main technical parameters are as follows:

 

Technical parameters Q345B carbon steel Q460 Low Alloy High Strength 316 stainless steel International Standards
Plate thickness 10-14mm 12-18mm 8-12mm Tolerance ≤ ±0.1mm
aperture 20-22mm 22-24mm 20-22mm Tolerance ≤ ±0.03mm
Hole center distance 150-300mm 200-350mm 150-300mm Tolerance ≤ ±0.03mm
Rated tensile strength ≥80kN ≥120kN ≥80kN ANSI C119.1
Ultimate tensile strength ≥120kN ≥180kN ≥120kN ANSI C119.1
Yield strength ≥345MPa ≥460MPa ≥515MPa ASTM A36/GB/T 700
Zinc layer thickness ≥100μm ≥100μm Zinc-free layer ISO 1461
Salt spray test No red rust after ≥1500 hours No red rust after ≥1500 hours No red rust after ≥2000 hours GB/T 10125
Zinc coating adhesion No peeling after 180° cold bending No peeling after 180° cold bending   ASTM A153
Operating temperature -40℃~80℃ -60℃~80℃ -60℃~100℃ IEC 61466
Plate flatness ≤±0.1mm/m ≤±0.08mm/m ≤±0.1mm/m ≤±0.2mm/m

 

 

The application scenarios of high strength yoke plate focus on high-end power transmission projects, power transmission projects under extreme conditions, and large-scale new energy power plants worldwide, with the core scenarios being three major categories: high tension, multiple splits, and extreme environments.

Ultra-high voltage transmission lines

adopt triangular high-strength tension yoke plates to evenly transfer the concentrated high tension of the conductor to the tower, which is suitable for the high load requirements of ultra-high voltage transmission.

Long-span power transmission projects

ultra-long-distance long-span power transmission sections such as those spanning the sea, rivers, mountains, and deserts; trough-type adjustable high-strength yoke plates enable fine-tuning of tension to avoid misalignment of fittings and damage to conductors.

New energy power plant transmission engineering

Photovoltaic power plants and wind power plants use four-split conductors and triangular high-strength yoke plates, which are cost-effective, easy to install, and suitable for the construction needs of new energy power plants in remote areas.

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