Selection and requirements of strain clamp for ground wire?

Classification：Industry trends
author：Dapeng power
release time：2022-01-12
Views：202

Selection and requirements of strain clamp for ground wire?

【概要描述】

The ground wire tension clamp can be divided into wedge type and pressure type. The former can be used for the terminal of ground wire and the stay wire for fixing tower; Because the wedge clamp has the advantages of convenient construction and reliable operation, it is widely used in power transmission lines. However, during construction and installation, the installed steel strand must be bent into a circular arc to make it closely stick to the wedge of the clamp.

On the one hand, wedge clamp is generally used when small steel strand is used as lightning conductor, which has the advantages of convenient installation and reliable operation; When the cross-sectional area exceeds 70, it is difficult to install with wedge clamp, so compression type tension clamp should be used;

On the other hand, pay attention to the characteristics of the clamp. The bolt flip type tension clamp has the characteristics of light weight, small size, few accessories, no need to cut off the conductor and simple construction; 90% of the calculated tensile breaking force. However, it is only applicable to conductors below 240 section.

In addition, when using compression type tension clamp, the conductor shall be cut off and connected by hydraulic or explosive pressing process; That is, the aluminum wire, steel core and aluminum pipe and steel anchor of wire clamp at the connection shall be fully pressed together; Therefore, the clamp itself should bear all the tensile force of the conductor and have sufficient grip force. Its failure load should not be less than the calculated breaking force of the connected conductor, and the grip force of the clamp should not be less than 95% of the calculated breaking force of the conductor or lightning conductor; Instead, the clamp is a conductor in the circuit, and the resistance after crimping shall not be greater than that of the conductor with the same length of the installed conductor. When the line has a large load current, the temperature rise of the clamp shall not be greater than that of the installed conductor. Compression type tension wires shall be suitable for the installation of conductors with a section of 300 and above