
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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