Introduction and application of cable head

The operation of power cables is one of the important 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 properties. Therefore, cable maintenance is a crucial Work.

The transmission of power requires not only the safe operation of the cable, but also the cooperation of the cable supporting equipment. Therefore, this article will take you to understand the equipment other than the cable: the cable head.

First, the definition of cable head

The cable head is also called a cable joint. After the cable is laid, in order to make it a continuous line, each segment of the line must be connected as a whole, and the connection point is called the cable head. The cable joints in the middle of the cable line are called intermediate joints, and the cable joints at both ends of the line are called terminal heads. The cable joint is used to lock and fix the incoming and outgoing wires, and play the role of waterproof, dustproof and anti-vibration.

Second, the classification of cable head

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

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

According to the production and installation materials, it can be divided 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, it can be divided into copper core power cable head and aluminum core power cable head;

According to the material of the joint, it is divided into plastic cable joint and metal cable joint, among which metal cable joint is further divided into porous metal cable waterproof joint, anti-bending metal cable joint, double locking metal cable waterproof joint, plastic hose cable joint, metal hose cable joints, etc.;

According to the installation position: indoor type, outdoor type According to the wire core material: aluminum core cable head, copper core cable head.

3. Welding mode intermediate joint

Adopting technology: The intermediate joint is made of the intermediate joint of the cable by welding technology, which has the characteristics of low resistance and high connection strength.

Structural features: The original cable body structure is completely restored at the cable joint, and the conductor, inner semiconducting layer, main insulation and outer semiconducting layer at the joint are completely restored according to the original structure of the cable, so that the cable joint and the complete cable structure, etc. Effective matching; the cable fusion combination without active interface eliminates the interface and avoids the electrical hidden danger caused by the air gap between the cable insulation and the joint insulation; the same material as each layer of the cable, and the structure is the same as the cable body. Concentric cylinder structure, the electric field distribution is more uniform.

The intermediate joint of welding mode does not need special crimping tools, which eliminates the hidden danger of poor conductor connection and high contact resistance due to the mismatch of crimping dies; The conductor connection characteristics can meet the requirements of withstand transient fault current impact.

In addition, the intermediate joint in the fusion mode can restore the original cable body structure, and the cable fusion combination without active interface can eliminate the interface effect. The joint body and the layers of the cable body are integrated by fusion to eliminate the interface and inherently have internal waterproof properties.

In addition, for cables and cable equipment, we must insist on regular and regular line safety inspections. Professionals should be invited to conduct a thorough inspection at least once a year for wires, electrical equipment, etc., especially for wires with a long service life at the joints. If the wires are found to be aging, damaged, poor insulation and other unsafe conditions, they must be repaired and replaced in time to ensure electricity consumption. Safety. Finally, the editor reminds everyone that when purchasing wires and cables, you must look for regular manufacturers, check the quality, and do not buy some unqualified wires because of cheap prices.