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NLL Series Bolt Type Aluminum Alloy Strain Clamp And Insulation Cover

For 20 kV and lower overhead lines, NLL series bolt type aluminum alloy strain clamps are appropriate. They fix aluminum stranded wires or steel core aluminum stranded wires on the strain pole, are used for overhead insulated aluminum conductors and insulating covers, and serve as protective and insulating elements.

Feature

1. Clamp body is made of high strength aluminum alloy

2. Clean appearance, long service life

3. Simple installation, energy efficient

4. The product adopts bolt connection, firm grip, energy-saving accessories, no hysteresis or eddy current

Insulation Cover Performance Features

1. 1-10kV withstand voltage should be &#;18kV, no breakdown after 1 minute of holding voltage.
2. 20kV withstand voltage should be &#;30kV, no breakdown after 1 minute of holding voltage.

3. Insulation resistance is &#;1.0xΩ.

4. Ambient temperature is -30&#;-+90&#;.

5. After an artificial climate aging test lasting hours, climate resistance is good.

Model Specification

Model

Suitable Conductor

Dia(mm)

Main Dimensions (mm)

Specified failure load(kN)

M

C

NLL-1A

5.0-10.0

16

18

40

NLL-2A

10.1-14.0

16

22

40

NLL-3A

14.1-18.0

16

26

70

NLL-4A

18.1-23.0

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18

32

90

Images

What Is Strain Clamp?

The purpose of the strain clamps is to fasten conductors and ground wires to tower arms and substation structures using insulators or link fittings. Applications involving transmission or distribution lines are the major uses for it. Fixing the conductors to the body requires washers, nuts, and U bolts.

Tension clamp, strain clamp, dead end clamp

Tension clamp, strain clamp, dead end clamp refers to the hardware used to fix a wire to withstand wire tension and hang the wire onto a tension string group or tower. Tension clamps can be roughly divided into two categories based on their structure and installation conditions. Type 1: The tension clamp shall withstand the full tensile force of the conductor or lightning conductor, and the grip force of the clamp shall not be less than 90% of the rated tensile strength of the installed conductor or lightning conductor, but shall not be used as a conductive body. This type of wire clamp can also be removed after the wire is installed and used separately. This type of wire clamp includes bolt type tension wire clamp and wedge type tension wire clamp. Type 2: Strain clamps not only bear the full tensile force of the conductor or lightning conductor, but also serve as conductive materials. Therefore, once installed, this type of wire clamp cannot be disassembled, also known as a dead wire clamp. As it is a conductive body, the installation of the wire clamp must be carried out carefully in accordance with the relevant installation and operation regulations.

Brief introduction

Strain clamps are used for corner, splicing, and terminal connections. Spiral aluminum clad steel wire has extremely strong tensile strength and no concentrated stress, providing protection and auxiliary vibration reduction for optical cables. The complete set of optical cable tension fittings includes: tension pre twisted wire and supporting connection fittings. The grip strength of the cable clamp is not less than 95% of the rated tensile strength of the optical cable, which is convenient and fast to install, reducing construction costs. Suitable for ADSS optical cable lines with span &#; 100 meters and line angle<25 °

The tension clamp is used to fix the conductor or lightning conductor to the non linear tower tension insulator string, for anchoring purposes, and also for fixing the stay wire of the stay wire tower.

1&#; Classified according to its purpose

Cable tension clamp

Low tension wedge type strain clamp for ADSS optical cables

Low tension strain clamp for ADSS optical cable

Medium and high tension strain clamps for ADSS optical cables

Strain clamp for OPGW optical cable

Double strain clamps for OPGW optical cables

Wire tension clamp

1. Pre twisted wire tension clamp:

Pre twisted wire tension clamp for steel core aluminum stranded wire

Pre twisted wire tension clamp for aluminum stranded wire

Pre twisted wire tension clamps for insulated conductors

2. Pre twisted ground wire tension clamp:

Pre twisted ground wire tension clamp for steel strand

Pre twisted ground wire tension clamp for aluminum clad steel stranded wire

3. Pre twisted stay wire tension clamp:

Pre twisted stay wire tension clamp for steel strand

2&#; Classification by structure and installation method

1. Compression type tension clamp

2. Bolt type tension clamp

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