Introduction of different types of cable accessories

1. Heat shrinkable cable accessories
Heat shrinkable cable accessories, commonly known as heat shrinkable cable heads, are the most common accessories in power transportation. They are generally used on the terminals of high and low voltage cross-linked cables or oil-immersed cables. Compared with traditional cable accessories, they are small in size, light in weight, and It is safe, reliable and easy to install. It is widely used in the intermediate connections and terminals of cross-linked cables or oil-immersed cables with voltage levels of 35KV and below. The product conforms to the GB11033 standard, the long-term use temperature range is -55℃～125℃, the aging life is as long as 20 years, the radial shrinkage rate is ≥50%, the longitudinal shrinkage rate is <5%, and the shrinkage temperature is 110℃～140℃.

2. Wrapped cable accessories
Wrapped cable connectors are generally used in low-voltage cable connectors. Wrapped cable connectors are wound with insulating plastic tape. Its waterproofness, durability, and aesthetics are not as good as heat-shrinkable cable heads. The scope of application is limited to cables with a single core diameter less than or equal to 70mm2. It can only be laid in the open, not buried in the ground, and has poor safety performance. Touching by sharp objects or hitting by external force may damage the wound insulating tape and cause leakage accidents. But there is an advantage, that is, the cost is low and the construction is convenient.

3, cold shrinkable cable connectors
Cold-shrinkable cable connectors are now commonly used with cold-shrinkage stress control tubes, with voltage levels ranging from 10kV to 35kV. For cold-shrinkable cable terminal heads, 1kV class uses cold-shrinkable insulating tubes for reinforced insulation, and 10kV class uses cold-shrinkable joints with inner and outer semi-conductive shielding layers. The cold-shrinkable cable accessory material uses the excellent elasticity of high tear resistance and high elasticity silicone rubber, and uses spiral tubular plastic support materials to expand the original accessories to the outer dimensions required by the process. After installation, the support materials are continuously connected. Take it out, and the accessories are tightly wrapped on the cable by rubber elasticity. Conditions of use: -50～200.

Cold-shrinkable cable terminal heads have the advantages of small size, convenient and fast operation, no special tools, wide application range and few product specifications. Compared with heat-shrinkable cable accessories, it does not need to be heated by fire, and after installation, it will not be moved or bent like heat-shrinkable cable accessories. There is no danger of disconnection between the internal layers of the accessories (because the cold-shrinkable cable accessories are made of High tear resistance, high elasticity silicone rubber excellent elastic compression force).

4, cast type cable connectors
To put it simply, the cast-type cable connectors is to use a mold to fix the cable head, then pour epoxy resin into it, and then remove the mold after drying. It is more troublesome and cannot be poured in the tide to avoid moisture and reduce the insulation of the cable head.

5, prefabricated cable accessories
It is an accessory made by injecting silicon rubber into different components, vulcanizing and molding at one time, leaving only the contact interface, and inserting cables during on-site construction. The construction process reduces the unpredictable unfavorable factors in the environment to a relatively low level. Therefore, the accessory has huge potential use value and is the development direction of cross-linked cable accessories. However, the manufacturing technology is difficult and involves multiple disciplines and industries.