Such products are mainly dealing with stress management stress concentration of power. Parameter control method which uses the electric field stress concentration relief.

    The main advantage is the lightweight, easy to install, performance is still good. Cheap. Stress management is a moderate volume resistivity (1010-1012¦¸ocm), the larger the dielectric constant (20 - 25) special electrical parameters of the heat shrinkable tube, the use of electrical parameters of insulation shield to force the stress fracture along the evacuation into more uniform distribution of stress management. This technique can only be used for 35kV and below cable accessories. Because high voltage heat stress management will not work reliably. Its use in key technical question is: to ensure that the electrical stress control parameters specified value must meet the above criteria can only work reliably.

    Grease effect: semi-conductive grease filled cable insulation layer fracture to exclude the gas out of the air gap, to reduce the local discharge purposes.

    Stress management and insulation shield lap distance: XLPE cables due to poor handling of internal stress occurs when running a larger contraction, and therefore the stress in the installation of attachment attention of not less than corrugated pipe and insulation shield 20mm, to prevent the contraction stress shielded from the pipe and insulation. Shrink attachment for less flexibility in the thermal expansion and contraction operation may produce the interface gap, thus sealing technology is important to prevent moisture ingress.

    (2) prefabricated materials typically used in the annex silicone rubber or ethylene propylene rubber. Geometry method is used mainly to deal with stress cone problem of stress concentration. Its main advantage is that material performance, install more easily, and without heating to install, flexible, and makes the interface performance is greatly improved. In recent years, low-voltage and high voltage cable used in the main form.

    Shortcomings lies in the outer diameter of the cable insulation for high, the usual amount of interference in the 2-5mm (diameter of the cable insulation is greater than the inside diameter cable accessories 2-5mm), the amount of interference is too small, failure of the cable attachment; excessive interference, cable accessories installation is very difficult. Particularly prominent in the indirect head problems, the installation is neither convenient, and often the point of failure. Also expensive.

    Its use in key technical problem: the size of attachments and the size of the cable to be installed to comply with the requirements. There is also need to use silicone grease lubricated interface for easy installation while filling the air gap interface. Prefabricated accessories can generally rely on their own with a certain elastic rubber seal, and sometimes can be enhanced sealants and sealing flexible fixture.