Factors Affecting Cable Accessories Quality

Cable accessories quality factors are diverse, in principle, the following aspects:

1, electrical performance. Electrical performance is the quality of cable accessories to judge the primary principle. The main consideration is whether the electric field distribution of the cable accessories is reasonable, whether the measures to improve the electric field distribution are proper, the electrical strength of the material, the dielectric loss and the insulation margin of the products. At the same time, we must consider the stability of electrical properties, including cable accessories, chemical, physical properties and structural stability, such as the stability of stress control material properties, stress cone is easy to deformation, cable insulation retraction of the cable attachment of the electric field Distribution of the impact and prevention measures, the combination of various materials compatibility, combined with the stability of the interface performance. In addition, we should also consider the thermal properties of cable accessories, such as dielectric loss, contact resistance and stability of the conductor connection, heat conduction release, thermal expansion and contraction of the electrical properties of various components and mechanical properties.

2, sealing performance. Seal moisture resistance directly affects the electrical properties of cable accessories and service life. Terminal seal structure is reliable and stable. In general, the intermediate joint should also have a matching metal moisture-proof shell, especially buried or used in a humid environment.

3, mechanical properties. Terminal should have enough bending, shock ability. Intermediate joints should be able to withstand a certain degree of tension and to prevent external damage measures.

4, process performance. The process performance is an important condition for cable accessories design and selection, the installation process should be as simple as possible, easy on-site construction, short construction period; on-site environmental requirements and technical requirements of the workers is not high; easy to install quality control, reliable quality.

5, the manufacturer's quality assurance system. Prefabricated cable accessories factory, the factory provides rubber preform, pre-stress cone, porcelain sets, shell, impregnated components, such as in-site installation and then assembled into the overall terminal or connector, so each component Manufacturing quality and installation process quality is directly related to the final product quality.

This quality assurance procedure should include at least the following:

1) Ex-factory tests should be carried out strictly for key components (eg rubber stress cone, GIS epoxy casing, impregnating agent, prefabricated intermediate joint, etc.). Carefully check whether the test and measurement equipment is reliable, whether the test method is effective, whether the test personnel are well trained and the test records are complete;

2) whether the installation and construction personnel dispatched by the manufacturer are rigorously trained and have sufficient construction experience;

3) whether the coordination between different departments of the factory is good;

4) previous sales and operating records.

The reliability of high-voltage cable accessories from the electrical properties, moisture-proof seal, mechanical properties and process performance and other aspects of judgment.