Bolt-type Tension Clamps: Application And Selection In Tension Towers

A failed connection on a tension tower can bring down an entire electrical grid segment. Securing conductors under high mechanical load requires hardware that balances robust holding power with easy installation. The bolt-type tension clamp is a primary mechanical fitting designed for this exact purpose, ensuring system reliability without the need for specialized hydraulic compression tools.

Is a Bolt-Type Tension Clamp the Right Choice for Your Grid?

A bolt-type tension clamp utilizes high-strength bolts to apply constant pressure to the conductor, making it ideal for overhead lines where maintenance accessibility is a priority. Unlike compression fittings, this design allows for adjustments, re-tensioning, and non-destructive inspections during its operational lifespan.

Technical Selection Factors for Tension Towers

Selecting the correct bolted type strain clamp involves analyzing mechanical tension, conductor diameter, and environmental variables.

• Mechanical Load Limits: The clamp must meet or exceed the tension requirements of the span without causing conductor creep.

• Material Compatibility: Aluminum bodies prevent galvanic corrosion on ACSR conductors, while copper alloys are reserved for grounding.

• Environmental Resistance: Hot-dip galvanized components prevent rust in high-humidity or coastal installations.

Clamp Specifications by Conductor Type

4-Step Field Installation Protocol

1. Surface Cleaning: Remove the oxide layer from the conductor contact area.

2. Compound Application: Apply electrical joint compound to prevent future oxidation.

3. Conductor Positioning: Seat the conductor fully within the dead end strain clamp groove.

4. Diagonal Torqueing: Tighten the bolts on the bolted dead end clamp sequentially to ensure uniform pressure distribution.