The operation of power cables is one of the important links in our daily life, work, and production. The safety of power line operation is related to the safety production of enterprises and the safety of people’s lives and property. Therefore, power cable maintenance is a crucial task. The transmission of electricity not only requires the safe operation of power cables, but also the coordination of cable joint & termination.
1、 What is power cable joint
After the power cableS installed properly, we have to connect different single power cables into a continous one to make up a complete circuit; at this time, a power cable joint need to be used to connect these power cables.
2、 Classification of power cable joint
According to the installation location, it can be divided into indoor and outdoor types;
Based on its function, it would be a middile cable joint and cable terminal kit.
According to the production and installation materials, it can be divided into heat shrink (the most commonly used type), dry pack, epoxy resin casting, and cold shrink;
According to the material of the wire core, it can be divided into copper core power cable joints and aluminum core power cable joints;
According to the material of the joints, they are divided into plastic cable joints and metal cable joints, among which metal cable joints are further divided into Porous metal cable waterproof joints, anti bending metal cable joints, double locking metal cable waterproof joints, plastic hose cable joints, metal hose cable joints, etc;
3、 Fusion mode intermediate joint
Adopting technology: The intermediate joint of the cable is made by fusion welding technology, which has the characteristics of low resistance and high connection strength. Structural features: The cable joints are fully restored to the original cable body structure, and the conductors, inner semiconductor layer, main insulation, and outer semiconducting layer at the joints are fully restored to their original structure, so that the cable joints are equivalent to the complete cable structure; The fusion of cables without active interfaces can eliminate the interface and avoid electrical hazards caused by air gaps between cable insulation and joint insulation; A concentric cylindrical structure with the same material as each layer of the cable and the same structure as the cable body, resulting in a more uniform electric field distribution.
The fusion mode eliminates the need for specialized crimping tools for intermediate joints, eliminating the hidden dangers of loose conductor connections and high contact resistance caused by mismatched crimping molds; The contact of the conductor adopts exothermic welding technology, which has the characteristics of equal diameter, low resistance, and high strength conductor connection, and can meet the requirements of withstanding instantaneous fault current impact.
In addition, the intermediate joint of the fusion mode can restore the original structure of the cable body, and the cable fusion body without active interfaces can eliminate interface effects. The layers of the connector body and the cable body are fused together to form a cohesive whole, eliminating the interface and naturally possessing internal waterproof properties.
Finally, our expert engineers remind everyone to regularly conduct line safety inspections for cables and cable joint & cable termination kit. Professional personnel should be invited to conduct a comprehensive and thorough inspection of wires & cables, and its joint & termiantion. at least once a year, especially for circuits with long service life at power cable joints. If unsafe situations such as aging, damage, and poor insulation of wires are found, they should be repaired and replaced in a timely manner to ensure electrical safety.