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Date：12-07-2021
Casting type cable accessories use thermosetting resin materials, cast on-site in the mold or box body at the end of the cable or the joint after the treatment, and the cable accessories are formed after curing. Especially suitable for the interconnection of plastic extruded insulated cables and paper-impregnated insulated cables.
Separable connectors allow cables and other equipment and cables to connect or disconnect fully insulated cable accessories, such as terminals, joints, and branch joints. The main use objects of separable connectors are fully sealed switch cabinets, RMU, cable branch boxes and other equipment, which can be regarded as a new type of cable terminal. And more uses the structure of prefabricated terminal.
It is not difficult to see from the above-mentioned cable accessory product classification that prefabrication and cold shrink technology that can simplify on-site installation requirements have already occupied an important position in the development of cable accessories.
Application of new technology in cable accessory products:
The basic technical requirements of the conductor connection to the conductor connection are: good conductor connection: for the terminal, the cable conductive core, the outlet rod, and the terminal must be well connected; for the intermediate joint, the cable conductor and the connecting pipe must be well connected. That is, the contact resistance of the connection point is required to be small and stable. Compared with the resistance of wires of the same length and the same cross-section, the ratio of newly installed wires should not be greater than 1.
At present, crimping technology is mostly used on site, which requires certain professional equipment. With the bolt connection technology, only a torque wrench is needed during on-site construction to meet the basic technical requirements of conductor connection. This simplifies the professional requirements for installation equipment. And for aluminum cable connections that need to remove the non-conductive oxide layer, there is no need to perform a special deoxidation treatment in advance.
Insulation materials EPDM rubber and silicone rubber materials have been widely used in prefabricated cable accessories. In the field of high-voltage cable accessories, comparatively speaking, they can be divided into European structure with silicone rubber as the base material and EPDM A Japanese-style structure with acrylic rubber as the base material. In the medium voltage field, the improved EPDM rubber cable accessories have better mechanical strength and tear resistance than similar silicone rubber products.
On-site pre-expansion technology is also an installation method for cold-shrinkable cable accessory products, that is, a few hours before installation, the cold-shrinkable joints are pre-expanded on-site with simple disposable tools. It avoids the partial performance loss of conventional cold-shrinkable products during transportation and long-term storage, thereby providing a more constant, durable and reliable radial pressure. Especially suitable as spare parts for the system. In short, in order to facilitate on-site installation and ensure the quality of installation, reduce the excessive requirements on the technical level of on-site installers. Prefabrication and simplification will become the main development direction of cable accessory technology in the future. The prefabrication of products can be tested before leaving the factory.
Cold-shrinkable cable accessories will become the mainstream of the site, thereby further ensuring the safe and reliable operation of the power system, and achieving the best combination of technology and economy.
