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The Stress Control Tube in Heat Shrinkable Cable Accessories

2022-11-11
In the process of cable installation and maintenance, the Heat Shrinkable Cable Accessories are often used. The Heat Shrinkable Cable Accessories are composed of many parts. The materials used in the Heat Shrinkable Cable Accessories are generally composed of blends of polyethylene, ethylene - vinyl acetate (EVA), ethylene - propylene rubber and other materials. Heat Shrinkable Cable Accessories include heat shrinkable Breakout, heat shrinkable insulation tube, heat shrinkable Stress Control Tube, etc., as well as the solder paste, silicone paste, ground wire, solder wire and so on, today we will talk about the Stress Control Tube which plays an important role.

Among the accessories of Heat Shrinkable Cable Accessories, the Stress Control Tube is a very important part. The Stress Control Tube is a heat-shrinkable tube with special electrical parameters with moderate volume resistivity (1010-1012Ωocm) and large dielectric constant (20-25). The electrical parameters are used to force the stress at the cable insulation shield fracture to be dispersed into a more uniform distribution along the Stress Control Tube.


Stress Control Tube


The Stress Control Tube technology can only be used in cable accessories up to 35kV because the Stress Control Tube will heat up and not work reliably when the voltage level is high. The key technical problem in the use of Stress Control Tube is to ensure that the electrical parameters of Stress Control Tube must meet the above standard to work reliably.

Some details should be paid attention to when installing the Stress Control Tube. Due to poor handling of internal stress, the cross-linked cable will shrink greatly in operation to prevent the Stress Control Tube from separating from the insulation shield during shrinkage. Therefore, the lap distance between the Stress Control Tube and the insulation shield is not less than 20mm. Due to the small elasticity of the heat-shrinkable cable accessories, the surface may have an air gap during the operation of thermal expansion and cold contraction, so the sealing technology is very important to prevent moisture immersion.

The main function of the Stress Control Tube is to deal with the problem of electric stress concentration, that is, to relieve the electric field stress concentration by using the parameter control method. The quality of cable accessories is very important, each supporting product should have good quality, in order to form a set of guaranteed cable accessories.


Stress Control Tube

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PE Heat Shrinkable Tube and PVC Heat Shrinkable Tube

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Heat Shrinkable Tube Expansion Technology
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