Silicone rubber cone due to 110kv termination

Silicone rubber cold shrinkable cable accessories are parts of various cable accessories made of elastomer materials (commonly silicone rubber and Ethylene propylene rubber), which are molded by injection vulcanization in the factory, then expanded and lined with plastic spiral supports. During on-site installation, these pre expansion components are placed at the treated cable ends or joints, and the plastic spiral strips (supports) that are internally supported are pulled out and pressed onto the cable insulation to form a cable accessory. Because it relies on elastic retraction force at room temperature, rather than using fire to heat and shrink like heat shrink cable accessories, it is commonly known as cold shrink cable accessories. The early cold shrink cable terminal only used silicone rubber cold shrink components for additional insulation, and the electric field treatment still used stress cone or stress tape wrapping.

Nowadays, cold shrinkage stress control tubes are commonly used, with voltage levels ranging from 10kV to 110kV. Cold shrink cable joints, 1kV grade using cold shrink insulation pipes for reinforced insulation, and 10kV grade using cold shrink insulation components with inner and outer semi conductive shielding layers for joints. Cold shrink branch sleeves are used at the forks of the three core cable terminals.

Silicone rubber cold shrink cable accessories have the advantages of small size, convenient operation, speed, no need for special tools, wide applicability, and fewer product specifications. Compared with heat shrinkable cable accessories, they do not require fire heating, and there is no risk of interlayer detachment inside the accessories when moved or bent after installation (as cold shrinkable cable accessories rely on elastic compression force). Compared with prefabricated cable accessories, although they rely on elastic compression to ensure internal interface characteristics, they do not correspond to the cable cross-section one by one like prefabricated cable accessories, and have multiple specifications.