Connecting Link Fittings At The Rear Of Bolt-type Tension Clamp
The bolt-type tension clamp serves as a fundamental component in overhead line construction. It secures conductors to strain towers through mechanical pressure. Positioning specific link fittings at the rear of the clamp ensures proper tension distribution and alignment within the electrical grid system.
Role of Dead End Strain Clamp in Line Termination
A dead end strain clamp provides the necessary holding strength for ACSR or aluminum conductors. It transforms the kinetic energy of the wire into static mechanical tension. The rear connection point is critical because it links the clamp body to the insulator string or the tower cross-arm.
Reliable installations utilize the bolted type strain clamp to maintain conductor integrity without causing damage to the outer strands. Engineers often specify these components for low to medium voltage distribution lines where high grip strength is mandatory for safety.
Rear Link Positioning
The rear section of a bolt-type tension clamp typically connects to U-shackles, ball eyes, or clevis links. This connection point allows for the necessary flexibility and articulation of the conductor assembly. Proper installation of these links at the tail end prevents stress concentration and ensures the line remains stable under varying wind loads and ice accumulation.
Structural Components and Technical Specifications
The design of a bolted dead end clamp focuses on ease of maintenance and durability. High-strength aluminum alloy or galvanized steel prevents corrosion over decades of exposure. The following table outlines the standard technical parameters for these assemblies.
| Component Part | Material Grade | Typical Load Rating (kN) | Application Environment |
|---|---|---|---|
| Clamp Body | Aluminum Alloy | 40 - 120 | Coastal / Industrial |
| Keeper Plate | Galvanized Steel | N/A | High Tension |
| Rear Link Pin | Stainless Steel | 70 - 160 | Universal |
| U-Bolts | High Strength Steel | 25 - 90 | Standard Utility |
Installation Steps for Link Fittings
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Alignment: Position the conductor inside the clamp groove to ensure the tail extends correctly toward the rear.
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Bolt Tightening: Secure the U-bolts using a torque wrench to reach the manufacturer’s specified Newton-meters.
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Link Attachment: Connect the rear fitting, such as a PH-type extension link, to the clamp's trailing eye.
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Pin Securing: Insert the cotter pin through the clevis bolt to prevent accidental detachment during vibration.
Enhancing Mechanical Stability
Integrating the bolted type strain clamp with high-quality link fittings reduces the risk of fatigue failure. The articulation at the rear allows the assembly to swing naturally, which dampers vibrations caused by Aeolian winds. This flexibility protects the conductor from bending stresses at the mouth of the clamp.
This configuration is favored for its adjustability. Unlike compression types, the bolted design permits re-tensioning of the line during routine maintenance without replacing the entire hardware string.
