Cable accessories have an important influence on its use. The factors to judge the quality of the accessories are multiple. In principle, include the following.
Electrical Performance
Electrical performance is the main principle for judging the quality of cable accessories. The main consideration is whether the electric field distribution of the cable accessories is reasonable, whether measures to improve electric field distribution are adequate, the electrical resistance of the material, dielectric loss and insulation margin of the product.
At the same time, The stability of the electrical properties must also be taken into account., including the chemical properties and physical characteristics of the cable accessory materials and the stability of the structure, such as the performance stability of tension control materials, the ease of deformation of the stress cone, etc.
Besides, The thermal properties of the cable accessories must be taken into account, such as dielectric loss, the contact resistance of the connection of the conductors and their stability, conduction of heat release, the impact of thermal expansion and contraction on the electrical and mechanical properties of components, etc.
Sealing Performance
The tightness and resistance to humidity directly affect the electrical performance and the useful life of the devices. cable accessories. Whether the sealing structure of the terminal is reliable and stable. Usually, the intermediate connector must also have a moisture-proof metal casing, especially if buried directly or used in a humid environment.
Mechanical properties
The terminal must have sufficient resistance to bending and vibrations. Intermediate joints must be able to withstand a certain tensile force and measures to prevent external damage.
Installation Process
The installation process should be as simple as possible to facilitate on-site construction and short construction period. The requirements of the construction environment and the technical level of the workers are not high. Installation quality is easy to control and quality is reliable, etc.
Manufacturer Quality Assurance System
The manufacturer's quality assurance system. When prefabricated cable accessories leave the factory, the manufacturer provides prefabricated rubber parts, prefabricated tension cones, porcelain sleeves, casings, impregnants and other components. And then assembled into a complete terminal or joint during on-site installation. Therefore, The manufacturing quality of each component and the good or bad installation process are directly related to the final quality of the product..
The quality assurance procedure must include at least the following elements.
- Factory testing of key components must be carried out rigorously in the cable factory. Carefully check that test and measurement equipment is reliable, that the test methods are valid, that testers are well trained and that test records are complete.
- Whether the installation and construction personnel sent by the manufacturer are well trained and have sufficient construction experience.
- If there is good coordination between the different departments of the manufacturing plant.
- Previous sales and transaction records.