Introduction and Application of Cable terminals

The operation of power cables is one of the crucial links in our daily life, work and production. The safety of cable line operation is related to the safe production of enterprises and the safety of people's lives and property. Therefore, the maintenance of cables is a vital task. The transmission of electricity not only requires the safe operation of cables but also the cooperation of cable supporting equipment. This article will take you to understand the equipment other than cables: cable terminals.

I. Definition of Cable Terminal

The cable terminal, also known as the cable joint, after the cable is laid, in order to make it a continuous line, each section of the line must be connected as a whole, and the connection point among them is called the cable terminal. The cable joint in the middle of a cable line is called an intermediate joint, while the cable joints at the two ends of the line are called terminal heads. Cable joints are used to lock and fix the incoming and outgoing lines, serving to prevent water, dust and vibration.

Ii. Classification of Cable Terminals

According to the installation site, it can be divided into indoor type and outdoor type.

According to the form of the part, it can be divided into power cable intermediate heads, power cable terminal heads and complete set terminal heads.

According to the manufacturing and installation materials, it can be further classified into heat shrinkable type (the most commonly used one), dry package type, epoxy resin casting type and cold shrinkable type.

According to the core material, power cable heads can be classified into copper core power cable heads and aluminum core power cable heads.

According to the material of the joint, cable joints are classified into plastic cable joints and metal cable joints. Among them, metal cable joints are further divided into multi-hole metal cable waterproof joints, anti-bending metal cable joints, double-locking metal cable waterproof joints, plastic flexible hose cable joints, and metal flexible hose cable joints, etc.

By installation location: indoor type, outdoor type. By core material: aluminum core cable head, copper core cable head.

Iii. Fusion welding mode intermediate joint

The technology adopted: The cable intermediate joint is made by fusion welding technology, featuring low resistance and high connection strength. Structural features: The cable joint is fully restored to the original cable body structure. The conductor, inner semiconductor layer, main insulation and outer semiconductive layer at the joint are all restored to their original bodies in accordance with the original structure of the cable, making the cable joint equivalent to the complete cable structure. The fused cable without an active interface eliminates the interface and can prevent electrical hazards caused by air gaps between the cable insulation and the joint insulation. The material is the same as that of each layer of the cable, and the structure forms a concentric cylindrical structure consistent with the cable body, making the electric field distribution more uniform.

The intermediate joint in the fusion welding mode does not require a dedicated crimping tool, eliminating the risk of loose conductor connection and high contact resistance caused by mismatched crimping molds. The contact points of the conductors adopt exothermic welding technology, featuring equal diameter, low resistance and high strength of conductor connection characteristics, which can meet the requirements of withstanding instantaneous fault current impact.

In addition, the fusion splicing mode intermediate joint can restore the original structure of the cable body, and the cable with no moving interface is fused together, thereby eliminating the interface effect. The joint body and each layer of the cable body are fused together to form a whole, eliminating the interface and inherently having an internal waterproof property.

Finally, for cables and cable equipment, it is necessary to insist on conducting regular and frequent safety inspections of the lines. Professional personnel should be invited to conduct a comprehensive and thorough inspection of wires, electrical equipment, etc. at least once a year. Especially for circuits with joints that have been in use for a long time, if any unsafe conditions such as aging, damage, or poor insulation of the wires are found, they should be repaired or replaced in a timely manner to ensure the safety of electricity usage.