Factors affecting the quality of cable accessories

The factors affecting the quality of cable accessories are diverse, and in principle, there are the following aspects:
Electrical performance
The quality of electrical performance is the primary principle for judging the quality of cable accessories. The main considerations are whether the electric field distribution of cable accessories is reasonable, whether the measures to improve the electric field distribution are appropriate, the electrical strength of the material, the dielectric loss and the insulation margin of the product. At the same time, the stability of electrical performance must also be considered, including the chemical, physical and structural stability of cable accessory materials, such as whether the performance of stress control materials is stable, whether the stress cone is easy to deform, the impact of cable insulation shrinkage on the electric field distribution of cable accessories and preventive measures, the compatibility of various materials, and the stability of the combined interface performance. In addition, the thermal performance of cable accessories should also be considered, such as dielectric loss, contact resistance of conductor connection and its stability, heat conduction release, and the impact of thermal expansion and contraction on the electrical and mechanical properties of each component.
Sealing performance
The sealing and moisture-proof performance directly affects the electrical performance and service life of cable accessories. Whether the sealing structure of the terminal is reliable and stable. Generally speaking, the intermediate joint should also have a matching metal moisture-proof shell, especially for direct burial or use in a humid environment.
Mechanical properties
The terminal should have sufficient bending and shock resistance. The intermediate joint should be able to withstand a certain amount of tension and prevent external damage.
Process performance
Process performance is an important condition for the design and selection of cable accessories. The installation process should be as simple as possible, convenient for on-site construction, and short in construction period; the requirements for the on-site environment and the technical level of workers are not high; the installation quality is easy to control and the quality is reliable.
Quality assurance system of manufacturers
When prefabricated cable accessories leave the factory, the manufacturer provides rubber prefabricated parts, prefabricated stress cones, porcelain sleeves, shells, impregnants and other parts, which are assembled into integral terminals or joints during on-site installation. Therefore, the manufacturing quality and installation process of each component are directly related to the final quality of the product.