High strength 3 hole yoke plates are mainly classified into three types based on their type and function:
Suspension-type three-hole yoke plate: The apex hole is used to connect to the tower crossarm, and the bottom hole is used to connect the double-split conductor. It is mainly used on straight-line towers to transfer vertical loads and slight horizontal wind loads. The plate thickness requirement is not high; moderate thickness is sufficient. The hole spacing matches the length of the suspension insulator string.
Tension-resistant three-hole yoke plate: Used for angle towers and terminal towers. The top hole connects to the tension insulator string, and the two bottom holes connect to the double-string tension clamps. Because it needs to withstand significant tension during use, the material requirements are more stringent, typically Q355B/A572, with a thicker plate. Reinforcing ribs or double-plate stacking are sometimes used.
High-strength 3-hole yoke plate for double-string insulators: The spacing between the two holes on the bottom edge is increased, making it suitable for double-string parallel insulators, improving insulation margin and load redundancy. It is primarily used in 220kV and above lines.
Choosing the right high strength 3 hole yoke plate can achieve twice the result with half the effort. If you are unsure how to choose, you can also consult us for a customized one-stop, practical solution.
Why do we call it the High Strength 3 Hole Yoke Plate? What advantages does it have compared to a regular yoke plate?
Material Upgrade: Standard yoke plates typically use Q235B material, while the high-strength model uses Q355B, increasing yield strength by over 40%.
Thickness Optimization: Under the same load, the High Strength 3 Hole Yoke Plate can be thinner while maintaining strength, or achieve a higher breaking load at the same thickness.
Process Enhancement: Includes hydrogen removal tempering, stricter galvanizing temperature and time control, and full-size inspection instead of spot checks.
Application Scenarios: Standard yoke plates are suitable for low-voltage lines of 110kV and below, while high-strength yoke plates can be used in 220kV and ultra-high-voltage lines, long-span lines, high-load lines, and lines in extreme environments.
The High Strength 3 Hole Yoke Plate has a wide range of applications. To ensure its effectiveness in every field, we implement quality control during production, which mainly includes the following details:
Molding quality control
Plasma cutting is used to ensure that the cut is flat, the external dimensional tolerance is ±1mm, the triangular symmetry and flatness are ≤ 1mm/m, to prevent stress concentration, to prevent the formation of zinc spikes and zinc nodules after galvanizing, to eliminate warping and twisting, and to avoid eccentric stress during later installation.
Machining precision control
The center distance tolerance of the three holes ≤ ±0.5mm, the three holes must be in the designed geometric position to ensure uniform force on the double-string insulators, the perpendicularity of the hole axis to the plate surface ≤ 0.05mm, to prevent bolt tilting and force eccentricity, the hole opening chamfer C1～C2, no burrs, no tool marks, no steps;
Mechanical performance quality control
The measured failure load must be ≥ the nominal load (120kN / 160kN / 200kN / 250kN / 300kN), the safety factor must be ≥ 2.5, the fracture mode must be ductile fracture, brittle fracture is prohibited, the strength must be guaranteed but not too hard, and brittle fracture must be avoided.
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