Types of common overhead transmission line fittings

The fittings of overhead transmission lines are used for conductors, insulator strings, and parts connected to poles and towers. According to the performance and use, the wire fittings can be roughly divided into hanging wire clamp, tensioning wire clamp, connecting metal fittings, connecting metal fittings, protecting metal fittings and drawing metal fittings.

1, the clamp

There are two kinds of wire clips: hanging wire clips and tensioning wire clips.

The suspension clip is used to fix the conductor on the suspension insulator string of the straight pole tower, or to hang the lightning conductor on the straight pole tower, and can also be used to support the transposition conductor on the transposition pole tower and to fix the route on the non-linear pole tower.

Tensioning wire clamp is used to fix wires to tensioning insulator strings of load-bearing poles and lightning rods to load-bearing poles. According to the different use and installation of spare parts, the tension clamp can be divided into bolt type and compression type. Bolt type tensioning clamp is used for conductors with cross sections of 240mm and above.

2. Connectting fittings

Connecting fittings are used to assemble insulators into strings, and connect and hang insulator strings on the cross arms of poles and towers. The connection of hanging clip, tensioning clip and insulator string, and the connection of wire harness and tower should all use connection fittings. According to the conditions of use, it can be divided into special connection fittings and general connection fittings.

3. Splicing Fitting

Connecting fittings are used to connect wire and lightning conductor terminals, connect jumpers of non-straight towers and repair damaged broken wires or lightning conductor. The common connection metal of overhead line has clamp pipe, pressing plate pipe, repairing pipe, and groove line clip and jumper clip, etc.

4, Protective fitting

Protective gold fittings are divided into mechanical and electrical categories. Mechanical protection is to prevent wire, lightning conductor caused by vibration and broken strand. Electrical protection fittings are designed to prevent premature damage of insulators due to uneven voltage distribution.

5. Cable fittings

The cable fittings are mainly used to stiffen, adjust and connect the cable of the cable tower, including all the parts from the top of the pole tower to the ground between the cable. According to the conditions of use, wire harness can be divided into three types: tightening, adjusting and connecting. The tightening part is used to tighten the end of the drawing wire, and must have enough grip force when contacting the drawing wire directly. Adjusting parts are used to adjust the tension of the cable. Connecting parts are used for wire assembly.

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Post time: Jun-21-2022

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