Wedge-type Tension Clamp Self-locking Principle: The Preferred Solution For Anchoring Overhead Conductors.
In the design and construction of overhead transmission lines, the conductor anchoring method of tension towers directly affects the long-term operational safety of the line. With its unique mechanical structure, dead end loop clamp stands out among many types of fittings and has become the mainstream solution for tension sections. The core of this clamp lies in utilizing the wedge principle to convert the conductor's tension into clamping force.
Mechanical Advantages of the Wedge Structure
Self-locking characteristics provide reliable gripping force. The fitting angle between the internal wedge and the outer shell of the dead end tension clamp has been precisely calculated. When the line is under tension, the wedge slides into the shell along with the conductor, and the radial force generated by this sliding tightens the clamp. This positive feedback mechanism makes the clamp's gripping force proportional to the conductor's tension. The matching fiber optic dead end clamp-pair steel-cored aluminum stranded wire has a holding power of over 95% of the calculated breaking strength of the conductor. Even under extreme weather conditions or when the outer aluminum wire breaks, this structure can still hold the steel core through the inner wedge, preventing accidents.
On-site Installation and Long-Term Operation Performance
Ease of installation and construction efficiency. At overhead line construction sites, the installation of wedge-type tension clamps does not require large power equipment such as hydraulic presses or explosive blasting. For insulated conductors, some wedge-type clamps do not even require stripping the insulation layer and can be installed directly. This characteristic simplifies the process:
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It reduces the complexity and time of high-altitude operations.
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It avoids potential damage to the conductor caused by stripping the insulation.
It offers maintenance-free and energy-saving characteristics. Traditional compression-type tension clamps form electrical joints after crimping, posing a risk of overheating during long-term operation. Since the fixed dead end clamp does not disconnect the wires, no current flows inside the body, so there is no issue of the electrical connector overheating. The clamp housing is mostly made of high-strength aluminum alloy, which not only eliminates hysteresis loss but also possesses excellent corrosion resistance. In European power grids, such as Germany, this structure has been widely adopted in tension sections, and its long-term operational stability and extremely low maintenance costs have been verified.
