High-voltage cable accessories are products that connect cables with transmission and distribution lines and related power distribution devices among high-voltage cables. Generally refers to the middle connector and terminal connector of various cables in the cable line. It forms a power transmission network together with cables. For a long time, cable manufacturing technology has made great progress, but the development of cable accessories is relatively lagging. Therefore, it is necessary to be more cautious when purchasing cable accessories to choose the right product.
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Cable accessories are mainly divided into three categories: terminals, connectors (cable intermediate junction boxes, ordinary connection boxes, insulated connection boxes, connecting pipes and connectors, etc.) and plug connectors. When we purchase, we can start from several aspects such as electrical performance, mechanical performance, relaxation characteristics, expansion deformation and electric field optimization.
Electrical performance
The electrical performance is the primary principle for judging the quality of cable accessories. This mainly considers whether the electric field distribution of the 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, etc. At the same time, the stability of electrical performance and the thermal performance of cable accessories must also be considered.
Sealing performance
The moisture-proof performance of the seal directly affects the electrical performance and service life of the cable accessories. Whether the sealing structure of the accessory is reliable and stable is very important. Generally speaking, even the intermediate joint should have a matching metal moisture-proof shell, especially if it is buried directly or used in a humid environment.
Mechanical behavior
The accessories should have sufficient resistance to bending and shock. Measures to withstand certain pulling force and prevent external force 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 to facilitate on-site construction; the construction period is short; 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.
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