Based on the general standards and practical application scenarios in the power fittings industry, we classify Multi-hole Yoke Plates. Classification by mounting hole is the most basic and commonly used classification method, which directly determines the connection capability. The structure and shape determine the corrosion resistance, load distribution, and applicable scenarios, which is especially important when used in corrosive environments. The load determines the installation position and function in the line, and is closely related to the tower type and conductor tension.
Multi-hole Yoke Plates are classified according to the number of mounting holes. This is the most intuitive classification method, as the number of holes directly corresponds to the number of insulator strings and conductor splits. This is also a question users often ask during consultations.
Double-hole yoke plate: Typically has two sets of four holes, symmetrically distributed, with the two sets of holes linearly symmetrical. It has a simple structure and is lightweight. It is mainly used for suspension and tension connections of double-split conductors, parallel connections of double-string insulators, and conventional connections in 220kV~330kV lines.
Three-hole yoke plate: Mainly includes three or five holes, with the hole positions equilateral or linearly distributed. The shape is usually triangular. The advantage of this triangular or linear distribution of the three sets of holes is good load distribution. It is mainly used in three-split conductor systems, connections of three-string insulators, multi-circuit connections in special substations, and 330kV~500kV lines.
Four-hole yoke plate: Usually rectangular in shape with eight holes. It is mainly used in four-split conductor systems, multi-string insulator connections in UHV lines, core connections in tension and angle towers, and 500kV~1000kV lines. Ultra-high voltage (UHV) lines; Multi-hole combination: Typically an irregular structure with multiple sets of holes in a composite distribution, it has a complex structure and high strength, and is suitable for special customized projects in UHV long-span lines, complex substations with multi-circuit and multi-equipment connections, and extreme load scenarios.
The structural shape directly determines the drainage, stress distribution, and corrosion resistance of the yoke plate, and is a core basis for selection in corrosive environments. Common structures of multi-hole yoke plates include rectangular yoke plates and triangular yoke plates.
Rectangular perforated mounting plate: Flat plate, rectangular shape, mounting holes are linearly symmetrically distributed at both ends of the plate. Simple structure, low processing cost, typically with medium corrosion resistance. Load is concentrated at both ends of the plate, resulting in relatively uniform stress distribution. Used in high-voltage lines in conventional environments.
Triangular perforated mounting plate: Flat plate, triangular shape, mounting holes are distributed at the three vertices. Stable structure, good load dispersion, medium corrosion resistance, load is distributed triangularly, strong stability, suitable for suspension connections, used for double-split conductor suspension in conventional environments.
For users, the most important aspect is the application. Based on different applications, multi-hole yoke plates can be categorized as follows:
Suspension-type multi-hole yoke plates:Primarily for vertical loads, multiple sets of holes evenly bear the weight of the conductor. The load is relatively small and evenly distributed, resulting in a lightweight structure. They are mostly flat/triangular in shape with symmetrically distributed holes, primarily used under the crossarms of straight-line towers.
Tension-type multi-hole yoke plates:Primarily for horizontal tension, multiple sets of holes disperse the enormous tension of the conductor. They handle large loads and require high strength, resulting in a heavy structure. They are mostly frame-type/GD-type trunnions, with thicker plates and a rationally distributed hole layout.
Divestration-type multi-hole yoke plates:Simultaneously bear horizontal tension and vertical loads, supporting multi-directional load transfer. The load is complex, and they are mostly Z-type/GD-type trunnion structures. They possess multi-hole connection capabilities and diversion functions, used at line bends.
