A 3 hole yoke plate enables the connection of a single-string insulator with double-split conductors, or the connection of two strings of insulators with a single conductor. It is primarily used for half-connection of double-line guy wires to distribute stress at a single point on the tower. During use, it can fix the spacing of the split conductors, preventing whipping and galloping of the 2/4 split conductors, maintaining electrical safety distances. The triangular structure ensures uniform stress distribution across the three holes, avoiding stress concentration and significantly improving fatigue resistance. The middle hole is often used as a temporary stress point for tensioning, traction, and live-line work.
Common models of 3 hole yoke plates are L-type, LV-type, and LF-type. When selecting a model, the maximum tension of the conductor should be used to determine the breaking load, matching the hole diameter with the insulator ball head, clamp, and bolt specifications. The environmental corrosion level determines the galvanizing thickness and stainless steel material. During installation, it is important to note that the connection must use spring washers and double nuts to prevent loosening, the bolt torque must reach the design value, the force direction of the three holes must be on the same plane, and off-center loading is strictly prohibited. In long-term use scenarios, regular inspections are required to ensure that the zinc layer is free from peeling and corrosion, the bolts are not loose, and the plate is free from cracks and deformation. In coastal areas, the inspection cycle should be shortened.
3 hole yoke plates typically feature a triangular structure. The triangle is recognized in engineering mechanics as the most stable geometric shape, resistant to deformation and collapse. Compared to other shapes, a triangle will not deform, twist, or collapse under external forces, maintaining its original shape regardless of whether it is subjected to unidirectional or combined tensile forces. During use, the triangular structure will not open, deform, or change its angle due to stress, fundamentally preventing hardware failure.
The design of a 3 hole yoke plate follows the principles of the shortest, most direct, and smoothest force path. During operation, it only bears tensile forces, not bending moments, shear forces, or torsional loads. The three holes are always on the same stress plane, and the force direction is consistent with the plate's plane, preventing additional bending, twisting, or warping. The natural support of the three-hole structure avoids the need for multiple hardware components, reducing connection points, decreasing the probability of failure, and improving overall safety.
From its appearance, the 3 hole yoke plate presents a rigid integral structure, without hinges, rotating parts, springs, wear parts, or easily aged parts such as plastics, rubber, and nylon. Precisely because of its simple structure, the probability of failure is also lower.
The biggest advantage of a 3-hole yoke plate is its uniform stress distribution, which can fundamentally prevent the risk of breakage. This advantage is mainly reflected in three aspects.
Uniform plate cross-section
The plate has a consistent thickness and sufficient width, with a smooth transition from the hole to the edge section. The load transfer is continuous and stable, avoiding local thinning, notches, grooves, sharp corners, and abrupt changes in the cross-section that create high stress areas. This is the main reason for ensuring stable force transfer.
Hole edge reinforcement
Making the weakest point the safest is also a major advantage of our design when designing 3-hole yoke plates. It ensures reasonable hole spacing, sufficient material between holes, smooth hole edges without tool marks or cracks, vertical hole walls, no holes, no angled holes, and overall reinforced hole design.
Fatigue fracture resistance
When used in power transmission lines, we must consider long-term exposure to wind vibration, conductor galloping, electrodynamic impact, and temperature cycle stress. A uniform stress structure can resist millions of fatigue loads without cracking, which is a key structure to ensure the safe operation of the yoke.
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