Analysis Of The Application And Installation Of Bolt-type Tension Clamps In Overhead Line Terminals

In the design of overhead power transmission and distribution projects, the selection of fittings directly affects the structural rationality and mechanical connection stability of line terminal nodes. As a common tension fitting, bolted type strain clamp is widely used in the terminal part of overhead lines to provide mechanical load-bearing for the connection between the conductor and the tension rod or insulator.

Definition and Basic Components

The so-called dead end strain clamp typically consists of a high-strength aluminum alloy body, U-bolt assemblies, fastening nuts, washers, and other components. During terminal connection, the overhead conductor is placed in the pre-fabricated slot of the clamp body, and multi-point bolt tightening achieves the gripping and fixation of the conductor. The clamp's structural design is compatible with different conductor types of diameter, including bare aluminum stranded wire, steel-cored aluminum stranded wire, and insulated conductors.

In overhead line projects, bolted dead end clamp is usually classified by model series, such as NLL-1, NLL-2, NLL-3, etc., allowing for matching appropriate sizes and structures according to conductor specifications and tension requirements. Common designs meet the mechanical performance requirements of industry standards and specifications.

Installation and Line Node Positioning at the Project End

At the terminal section of overhead lines, bolt-type tension clamps serve as the connection interface between the conductor and the tension pole or terminal insulator. The installation team positions the clamp at the top of the tension pole or the terminal pole's configuration location, and securely fixes the conductor using bolt assemblies, thus positioning the conductor at the tension node. This clamp structure is adaptable to various pole terminal scenarios, including corner nodes and tension areas in terminal sections.

During on-site construction, determining the clamp's positioning and matching specifications requires consideration of conductor type, voltage level, and construction environment requirements. When connecting the tension pole and insulator device, the clamp position is typically on the upper part of the terminal pole to ensure the conductor's tension direction conforms to design requirements.