What is the role of the tension clamp? Introduction to the classification characteristics of tensile clamps

In the cable corners such as optical cables, you will often see a kind of electric power fittings - tensile clamps. Do you know about the tensile clamps? The following small series will introduce you to the role of the tension clamp, the characteristics of the classification-grade tension clamp, etc., to help you understand the tension clamp in many aspects.

The role of tension clamp

The tension clamp is used to secure the wire to withstand the tension of the wire and to hang the wire to a string that is resistant to the string or tower. It is used to fix the wire or lightning protection wire on the tensile insulator string of the non-linear tower, and it is used for anchoring. It is also used to fix the cable of the cable tower, for cornering, connection, and terminal connection. The spiral aluminum clad steel wire has strong tensile strength and no concentrated stress, which protects the optical cable and assists in damping.

Classification of tensile clamps

The tension clamps can be roughly divided into two categories according to the structure and installation conditions.

The first type: the tension clamp is to withstand the full tension of the wire or the lightning protection wire. The clamping force of the clamp is not less than 90 of the rated tensile strength of the installed wire or lightning conductor, but not as a conductor. This type of clamp can be removed after the wire is installed and used separately. This type of wire clamp has a bolt type tensile clamp and a wedge type tensile clamp.

The second type: the tensile clamp is used as an electrical conductor in addition to the full tensile force of the wire or lightning conductor. Therefore, once this type of clip is installed, it can no longer be disassembled, which is also called a dead clip. Since it is an electrical conductor, the installation of the clamp must be carried out in strict accordance with the provisions of the installation and operation procedures.

According to the purpose, the tensile clamp can be divided into:

Cable tension clamp :

Small tension wedge type tensile clamp for ADSS cable

Small tension tensile clamp for ADSS cable

Medium tension and large tension tensile clamp for ADSS cable

Tension clamp for OPGW cable

Double tension clamp for OPGW cable

Wire tensile clamp:

1. Pre-twisted wire tensile clamp:

Pre-twisted wire tensile clamp for steel core aluminum stranded wire

Pre-twisted wire tensile clamp for aluminum stranded wire

Pre-twisted wire tensile clamp for insulated wires

2. Pre-twisted ground wire tension clamp:

Pre-twisted ground wire tensile clamp for steel strand

Pre-twisted ground wire tensile clamp for aluminum-clad steel stranded wire

The characteristics of the tension clamp:

(1) High strength: Each cable clamp has an additional length of twisting, which ensures that the clamping force can reach 100% of the rated breaking force (RBS) of the cable. It has strong versatility: it can be used with a variety of fittings. Large cable clamps and adjustable cable clamps can be used up to 1.001 inches (25.4mm, or 500mm2), which is the best choice for solving the problem of large domestic cable.

(2) Good corrosion resistance: the material is exactly the same as the pull wire, which can prevent the galvanic corrosion between the wire clamp and the wire.

(3) Simple installation: All kinds of cable clamps can be operated manually on site by hand, without any special tools, and can be completed by one person.

(4) The installation quality is easy to guarantee, the installation quality of the cable clamp is easy to ensure consistency, no special training is required, the inspection can be carried out by the naked eye, and the appearance is simple and beautiful.

Features of ADSS tensile clamp:

(1) The outer stranded wire is directly connected to the tower through a coupling fitting such as a ring to withstand the line load.

(2) The inner skein has a protective effect on the ADSS cable. The main functions are as follows:

a. Effectively transmit the longitudinal pressing force to the tension-bearing unit of the cable, aramid, to prevent the outer sheath of the cable from being over-stressed and pulled.

b. Transfer axial tension.

c. Increase the contact area with the cable to make the stress distribution uniform and no stress concentration point.

(3) Under the premise of not exceeding the side pressure strength of the ADSS cable, the cable has a large holding force and can withstand a large tension.

(4) The grip strength of the ADSS cable is not less than 95% of the ultimate tensile strength (UTS) of the cable, which is completely suitable for the cable erection.