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Other classification of Cold Shrinkable Cable Accessories

2023-02-07
Cold shrinkable cable accessories are made of elastomeric materials (commonly used silicone rubber and ethylene propylene rubber) injected and vulcanized in the factory, and then expanded and lined with plastic spiral supports to form various cable accessories parts.

In addition to the base cold shrinkable cable accessories, there are also model and cast cold shrinkable cable accessories.

Molded cable accessories are mainly used in 35kv and above crosslinked cable through type joints. It is the use of radiation crosslinked or chemical crosslinked polyethylene film strip wrapped in the treated cable joint, with the help of a special mold (aluminum mold or heat-resistant tension belt) pressed, and heated forming joint. In the production process, the irradiated crosslinked polyethylene strip is pre-stretched (stretched 30% at 100c, then cooled and cut), wrapped into a joint, and then retracted by heating, so that the air gap between the wrapped strip layers is compressed, so as to improve the air gap discharge voltage. This kind of joint has higher partial discharge level and is suitable for making cable joints with higher voltage level. Due to the long winding and heating time, the cable under 35kv is generally not used this connector. Even for 35kv cable joints, molded joints are not used much because the wrapping and prefabricated joints are more convenient.

35kv cable molding joint is field wrapping molding, therefore, in addition to the requirements of the operator in strict accordance with the size and requirements of the drawings, but also related to the construction of environmental conditions such as (humidity, dust, etc.), humidity should not be too large, the construction site should be rain and dust proof tent, wrapping should wear rubber gloves.

The materials used in the casting cable accessories include epoxy resin, polyurethane and acrylic ester, etc. Polyurethane is used more in the extruded insulated cable, mainly used as straight-through joints and branch joints. The curable polyurethane has high elasticity, and its expansion coefficient is close to that of extruded cable insulation material, which is very beneficial to improve the interface characteristics of cable insulation and reinforced insulation in the joint. Get together ammoniac cheese and JuAnYiXi strong bonding force, thus used as a JuAnYiXi insulated cable joint more show its superiority.

If the mold is used for casting, the semi-conductive self-adhesive tape should be wrapped around the insulating surface of the joint after demoulding, and then the shielding copper net should be applied. The copper net should be reliably connected with the shielding layer of the cable at both ends. Then, install the connector bridge line and the connector outer protective coating (usually a heat-shrinkable casing).


Cold Shrinkable Cable Accessories


The correct operation of pouring process has great influence on the performance of cable accessories, so special attention should be paid to it. First of all, check whether the casting agent used has exceeded the storage period (as indicated on the package). Before pouring, the two components of the casting agent should be thoroughly mixed, and then poured slowly from pouring to l to avoid bubbles.

Compared with the heat shrinkable cable accessories, cold shrinkable cable accessories do not need to use fire heating, and after installation, moving or bending will not be as dangerous as the thermal shrinkable cable accessories, internal layers of the accessories will come apart (because cold shrinkable cable accessories rely on elastic compression force). Compared with prefabricated cable accessories, although they rely on elastic compression force to ensure the internal interface characteristics, it does not correspond to the cable section as the prefabricated cable accessories, with more specifications.


Heat Shrinkable Cable Accessories

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