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Cable Accessories Influencing Factors
Sep 04, 2017

Power cable accessories are connected cables and transmission and distribution lines and related power distribution device products, generally refers to the cable in a variety of cable connection and terminal connection, which together with the cable constitute the power transmission network; cable accessories are mainly based on cable structure Of the characteristics, both to restore the performance of the cable, but also to ensure the extension of the length of the cable and the terminal connection. The reliability of high-voltage cable accessories can be judged from electrical performance, sealed moisture-proof performance, mechanical properties and process performance.

Grouped equipment

This quality assurance program should include at least the following:

(1) At the time of shipment, the factory test should be carried out strictly for key components (eg rubber stress cone, GIS epoxy casing, impregnant, preform of intermediate joint, etc.). Carefully check whether the test and measurement equipment is reliable, whether the test method is valid, 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 the different departments of the plant is good;

(4) previous sales and operation records.

Influencing factors

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

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

2, sealing performance. Sealed moisture resistance directly affects the electrical performance and service life of cable accessories. Whether the terminal seal structure is reliable and stable. In general, the middle connector should also have a metal-proof housing that is matched with it, especially buried or used in a humid environment.

3, mechanical properties. The terminal should have enough resistance to bending, shock capacity. Intermediate joints should be able to withstand a certain amount of tension and to prevent external damage measures.

4, 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. It is convenient for on-site construction. The construction period is short; the requirements of the site environment and the technical level of the workers are not high; the installation quality is easy to control and the quality is reliable.

5, the manufacturer's quality assurance system. When the prefabricated cable accessories are shipped from the factory, the manufacturer provides parts such as rubber prefabricated parts, prefabricated stress cone, porcelain sleeve, shell, dipping agent, etc., and then assembled into the whole terminal or connector when installed in the field. Therefore, The quality of the manufacturing and the installation process are directly related to the final quality of the product.

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