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Silicone Rubber Accessories For Power Cables
May 15, 2017

Silicone Rubber Accessories At present, the main varieties of Xlpe cable attachment used in 10kV and above voltage level have two kinds. The first major class is the cold shrink cable attachment, the second major class is prefabricated cable attachment.

Cold Shrink Cable Accessories More than 95% use silicone rubber materials. Prefabricated cable accessories about 80% are manufactured using silicone rubber materials.

Cold Shrink Cable Attachment

Silicone Rubber Accessories Cold Shrink Cable Attachment is the use of silicone rubber material high elasticity, high-temperature vulcanized silicone Rubber injection molding, processing into a variety of different structure of the tubular parts, and then use special machinery for various structure of the tubular parts to expand, when the part inner diameter expands to about 3 times times, the special plastic support tube is placed into the tubular parts so that the silicone rubber tubular parts remain dilated, and these expansion parts become parts of the cold shrink cable attachment.

On-site installation, the expansion of the components of these units into the end of the cable or connector, the internal support pipe (strip), silicone rubber parts automatically shrink tight pressure on the cable insulation above. That constitutes a cable attachment. Because it is at room temperature to rely on the elastic shrinkage of silicone rubber, rather than like hot shrink cable attachment to use fire to heat shrinkage, so commonly known as cold shrink cable attachment.

Cold Shrink cable attachment to silicone rubber has an important requirement, expanded storage for two years, still can be reset, still can shrink and pressure on the cable insulation above.

2. Prefabricated Cable Accessories

Silicone Rubber Accessories Prefabricated cable attachment is the high temperature vulcanization silicone rubber injection molding, processing into a variety of different structure of the tubular parts (not expansion).

On-site installation, molded vulcanization molding less than the cable insulation diameter of tubular parts directly into the end of the cable or connector at the insulation of the cable, because the silicone rubber components are less than the internal diameter of cable insulation, so it can directly pressure on the cable insulation above, constitute prefabricated cable accessories.

It can also be said: Because of the new varieties of silicone rubber materials, silicone rubber materials, the gradual improvement of physical properties of silicone rubber, especially liquid high temperature vulcanization of the process of progress, for the power cable accessories industry to develop new products, improve product quality, improve the passing rate of products created conditions.

III. Introduction of HV cable Terminals

110-220kV cross-linked polyethylene

Is the insulation cable terminal of the classic products, is a porcelain sleeve (or composite casing) cable terminals, the cable terminal features of the ultra strong insulation performance; good weather resistance.

Structure characteristics of 3.1 casing HV XLPE cable Terminals

① the specific shape of the prefabricated rubber electrical stress control cone sleeve on the insulation of the cable with the cable shielding;

Silicone Rubber Accessories The electric field distribution at the end of the cable is improved by the combination of the semi conductive rubber material with a specific curve and the insulating rubber material in the internal rubber-stress control cone.

The strength of the electric field at the end of the cable is controlled by the elasticity of the precast rubber stress cone material to exert the basic constant interfacial pressure on the junction of the cable insulation and the outer shielding and cut-off surface.

3.2. High voltage XLPE cable terminal core components

Prefabricated electrical stress control conical Characteristics:

The rubber electric stress control cone is an effective method to control the electric field distribution at the end of the cable:

A prefabricated electrical stress control cone formed by a combination of insulating rubber and conductive rubber is set for a specific shape in the outer shielding of the cable. It can effectively control the electric field distribution at the end of the cable and prevent the discharge of the cable terminal.