Transmission Line Conductor Cable Stringing Equipment Aerial Laying Pulley Block
Transmission Line Conductor Cable Stringing Aerial Laying Pulley Blocks are essential tools used in the installation of overhead transmission lines to guide and support conductors, OPGW, ADSS, and communication cables during aerial stringing operations.
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Transmission Line Conductor Cable Stringing Aerial Laying Pulley Blocks are essential tools used in the installation of overhead transmission lines to guide and support conductors, OPGW, ADSS, and communication cables during aerial stringing operations.
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Typically constructed with a galvanized steel frame for strength and corrosion resistance. The sheaves (wheels) are made of high-strength materials such as MC nylon or aluminum alloy, often with rubber lining to protect conductors from abrasion. The sheaves are mounted on ball bearings for smooth rotation and reduced friction. -
Sheave Sizes and Configurations:
Pulley blocks come in various sheave diameters to accommodate different conductor sizes and types. Common diameters range from about 120 mm up to 1040 mm or more, with widths from 30 mm to 125 mm. They are available with single, three, five, or even seven sheaves, allowing use with single conductors or bundled conductors (two or three bundled lines). -
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Rated working loads vary widely depending on model and size, from as low as 5 kN for small blocks to 150 kN or more for large multi-sheave blocks. For example, a three-wheel nylon pulley block with 1040 mm diameter wheels can handle a rated load of 110 kN and conductors up to 1000 mm². -
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These pulley blocks are used to support and guide conductors during aerial stringing, preventing conductor damage and reducing pulling tension. They are suitable for overhead power lines ranging from medium to extra-high voltage transmission lines (e.g., 350–500 kV lines). They also protect cables from friction and help in smooth laying of conductors over long spans. -
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Some blocks include rubber-covered sheaves to reduce conductor wear, and are customizable to meet specific project requirements. They may also be designed for use with glass disc insulators or other insulator types in transmission line construction. -
| Feature | Description |
|---|---|
| Frame Material | Galvanized steel |
| Sheave Material | MC Nylon or Aluminum alloy, sometimes rubber-lined |
| Sheave Diameter Range | 120 mm to 1040 mm+ |
| Sheave Width Range | 30 mm to 125 mm |
| Sheave Count | 1, 3, 5, or 7 sheaves |
| Rated Load Capacity | 5 kN to 150 kN+ |
| Conductor Size Capacity | Up to 1000 mm² cross-section |
| Applications | Overhead transmission line conductor stringing |
| Special Features | Rubber covering, ball bearings, customizable |
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Three Wheel Nylon Pulley Block (1040x125 mm): Rated load 110 kN, suitable for conductors ≤1000 mm².
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Single Sheave Nylon Pulley Block (822 mm diameter): Rated load 30 kN, used for large diameter conductors like ACSR 350–500 kV lines.
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508 mm Diameter Stringing Pulley Blocks: Available with 1, 3, or 5 sheaves, rated loads from 20 kN to 60 kN, suitable for conductors up to 400 mm².
These pulley blocks are vital for efficient, safe, and damage-free aerial laying of transmission line conductors, widely used in power utilities and line construction projects worldwide.
