Grounding roller Stringing cable pulley Block for OHTL power transmission lines
A Stringing Block with a Grounding Roller is a specialized pulley block used in overhead power transmission line construction to guide and support conductors or pilot ropes during stringing operations while providing grounding protection.
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A Stringing Block with a Grounding Roller is a specialized pulley block used in overhead power transmission line construction to guide and support conductors or pilot ropes during stringing operations while providing grounding protection.
Key Features:
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Grounding Roller: This component ensures the stringing block is electrically grounded, protecting workers and equipment from electrical hazards by safely discharging any induced or stray currents during conductor pulling.
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Sheaves: Typically available with 1 to 5 sheaves (pulleys), made from materials such as aluminum alloy lined with neoprene, MC nylon, or steel to minimize conductor damage and reduce friction.
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Sizes: Sheave diameters commonly range from 508 mm up to 916 mm or larger, suitable for different conductor sizes and types.
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Load Capacity: Rated loads vary depending on model and number of sheaves, commonly from 20 kN up to 60 kN or more.
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Construction: Frames are usually made of galvanized steel for corrosion resistance and durability in outdoor environments.
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Applications: Used to string pilot ropes and conductors safely and efficiently on overhead power lines, especially in helicopter-assisted stringing operations.
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Examples of Models:
| Model | Sheaves | Sheave Diameter (mm) | Rated Load (kN) | Features |
|---|---|---|---|---|
| SHDN508Z | 1 | 508 | 20 | Grounding roller, MC nylon sheave |
| SHSN508Z | 3 | 508 | 40 | Grounding roller, aluminum alloy sheaves |
| SHWN508Z | 5 | 508 | 60 | Grounding roller, aluminum alloy sheaves |
| SHDN660Z | 1 | 660 | 20 | Grounding roller, MC nylon sheave |
| SHSN660Z | 3 | 660 | 40 | Grounding roller, aluminum alloy sheaves |
| SHWN660Z | 5 | 660 | 60 | Grounding roller, aluminum alloy sheaves |
Usage:
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These stringing blocks are designed for pilot rope pulling and conductor stringing on overhead transmission lines.
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The grounding roller feature enhances safety by preventing electrical hazards during stringing.
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The sheaves are lined or made from materials that protect conductor surfaces and reduce wear.
Summary:
A Stringing Block with Grounding Roller is an essential tool in overhead power line stringing, combining mechanical support for conductors with electrical safety features. It is available in various sizes and configurations to suit different conductor types and stringing methods, often used in helicopter-assisted or manual stringing operations. The grounding roller ensures safe dissipation of electrical charges, protecting personnel and equipment.
