At present, there are two main types of cross-linked power cable accessories for 10kV and above voltage grade in China. The first category is cold shrinkable cable accessories, the second category is prefabricated cable accessories.


More than 95% of cold shrinkable cable accessories are made of silicon rubber material. About 80% of prefabricated cable accessories are made of silicone rubber material.

1. Cold shrinkable cable accessories

Cold shrinkage cable accessories is the use of silicone rubber materials of high elastic, will adopt high temperature vulcanization silicone rubber injection moulding vulcanization molding, processed into a variety of different structure of tubular parts, with special machines for various structure of tubular components to expand, when the parts inside diameter expansion to about three times, will be a special plastic supporting tube into tubular parts, The silicon rubber tubular parts are kept in an expanded state, and these expanded state parts are the parts of the cold shrinkable cable accessories.

During field installation, these expanded parts are put into the treated cable ends or joints, and the internal supporting tubes (bars) are drawn out. The silicone rubber parts automatically shrink and press on the cable insulation. It is constituted as cable accessories. Because it depends on the elastic retracting force of silicon rubber at room temperature, rather than the heat shrinkage cable accessories to use fire to heat and shrink, it is commonly known as cold shrinkage cable accessories.

2. prefabricated cable accessories
Prefabricated cable accessories are made of high temperature vulcanized silicone rubber by injection molding and vulcanization molding, and processed into tubular parts of various structures (without expansion).

During field installation, the molded and vulcanized tubular parts smaller than the insulation diameter of the cable are directly inserted into the cable insulation at the treated cable end or junction. Because the inner diameter of the silicone rubber parts is smaller than the cable insulation, it can be directly pressed on the cable insulation to form the prefabricated cable accessories.

Also can say so: as the roll out of new varieties of silicone rubber material, the gradual improvement of the physical properties of silicone rubber materials, due to the high temperature vulcanization silicone rubber, especially liquid silicone rubber material of the progress of fabrication procedure, for the power cable accessories industry development of new products, improve product quality, improve product percent of pass.