Introduction of Cable Accessories

Cable Accessories are products that connect cables with transmission and distribution lines and related power distribution devices. The reliability of high-voltage Cable Accessories can be judged from the aspects of electrical performance, sealing and moisture-proof performance, mechanical performance, and process performance. So, let us take a look at the introduction of Cable Accessories. Here are some answers.

Here is the content list:

•  The connection method of Cable Accessories.

•  Types of Cable Accessories.

•  Influencing factors of Cable Accessories.

The connection method of Cable Accessories.

The connection mode of Cable Accessories is generally divided into terminal connection and intermediate connection. Terminal connections are divided into indoor terminals and outdoor terminals. Generally, outdoor terminals refer to open-air cable joints, and indoor terminals refer to indoor connection cables and electrical equipment joints. The intermediate connection of Cable Accessories is divided into two types: straight-through type and insulated type.

Types of Cable Accessories.

There are many types of Cable Accessories, which have different types of characteristics and limitations, and generally cannot replace each other. The common ones are as follows:

Wrapping type: Cable accessories made on-site with rubber strips (self-adhesive) are called wrapping type Cable Accessories, which are easy to loosen, have poor fire resistance, and short life.

Pouring type: It is poured on-site with thermosetting resin as the main material. The selected materials are epoxy resin, polyurethane, acrylic, etc. The fatal disadvantage of this type of Cable accessory is that it is easy to produce bubbles during curing.

Molded type: It is mainly used for the middle connection of cables. It is integrated with the cable by molding and heating on the spot. The production process of these Cable Accessories is complicated and takes a long time, and it is not suitable for terminal joints.

Cold shrinkage type: use silicone rubber, EPDM rubber, and other elastomers to be pre-expanded in the factory and added with plastic support strips to form. During on-site construction, the support strips are pulled out to make the pipe material shrink on the cable under the inherent elastic effect of rubber to make Cable Accessories. TheCable Accessories are most suitable for construction sites that cannot be heated by open flames, such as mines, petrochemicals, etc.

Heat-shrinkable type: the rubber-plastic alloy is made into different component products with a shape memory effect, and the accessories are made by heating and shrinking on the cable on site. The Cable Accessories have lightweight, simple, and convenient construction, reliable operation, low price, etc. Features.

Prefabricated type: Silicone rubber is injected into different components, vulcanized at one time, and only the contact interface is retained. The accessories are made by inserting cables during on-site construction. The construction process minimizes unpredictable unfavorable factors in the environment. Therefore, Cable Accessories have huge potential use value and are the development direction of cross-linked cable accessories. However, manufacturing technology is difficult and involves multiple disciplines and industries. The installation materials of prefabricated Cable Accessories below the three-prong and shielding port of the cable still use heat-shrinkable materials, so they are a combination of prefabricated and heat-shrinkable.

Influencing factors of Cable Accessories.

The factors that affect the quality of Cable Accessories are multiple. The factors that affect the quality of Cable Accessories include electrical performance, sealing performance, mechanical performance, process performance, manufacturer's quality assurance, and so on.

Electrical performance is the primary principle for judging the quality of Cable Accessories. The main consideration is 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, etc. At the same time, the stability of electrical properties must also be considered, including the chemical, physical properties, and structural stability of the Cable Accessories materials, such as whether the performance of the stress control material is stable, whether the stress cone is easily deformed, and the electric field of the cable accessories due to the shrinkage of the cable insulation The influence of distribution and preventive measures, the compatibility of various material combinations, the stability of the combined interface performance, etc. In addition, the thermal performance of Cable Accessories should also be considered, such as dielectric loss, contact resistance and stability of conductor connections, heat conduction release, thermal expansion, and contraction on the electrical and mechanical properties of each component, etc.

The moisture-proof performance of the seal 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 if it is buried directly or used in a humid environment. In addition, the terminal of Cable Accessories should have enough anti-bending and anti-vibration capabilities. The intermediate joint should be able to withstand a certain amount of tension and measures to prevent damage from external forces.

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 and a short construction period. The installation quality is easy to control, and the quality is reliable. When prefabricated Cable Accessories leave the factory, the manufacturer provides rubber prefabs, prefabricated stress cones, porcelain sleeves, shells, impregnating agents, and other components, which are assembled into integral terminals or joints during the on-site installation. Therefore, the manufacturing quality and installation process are directly related to the final quality of the product.

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