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The difference between Cold Shrink Cable Termination and Heat Shrink Cable Termination

2022-10-06
Many people ask what is the difference between cold shrink termination and heat shrink termination when purchasing them. It is well known that the electrical performance of the cold shrink termination will be better than that of the heat shrink termination. So the following is the specific difference between the heat and cold shrinkable termination.

Structure

The design principle of the cable termination should meet and achieve the requirements: make the cable safe to operate in any natural environment. In order to achieve this, we need to pay attention to the four key factors, namely :(1) sealing, (2) insulation, (3) electric field, (4) process and other elements, which is also the four important problems to solve the cable termination.

The difference: Sealing.

Because most of the cable termination are installed in outdoor overhead, directly buried and other environments, waterproof and moisture-proof has become one of the keys to ensure the safe operation of cable termination, and it is necessary to consider its sealing performance and methods.

Because the cold shrinkable cable accessories are actually elastic cable accessories; In other words, it uses the elasticity of the liquid silicone rubber itself to pre-expand in the factory so that the plastic and support strips can be put in. To the site to the designated position, remove the support strip to allow natural shrinkage. This technology is cold shrinkage technology, this accessory is cold shrinkable cable accessories, so this cold shrinkable cable accessory has good "elasticity", can avoid the thermal expansion and cold contraction of cables due to atmospheric environment, load level in cable operation. That is, the gap between the insulation caused by "cable breathing" causes the breakdown accident. The biggest disadvantage of heat shrinkable accessories is that they are not elastic. Therefore, it is the best choice for the cold shrinkable cable accessories to be used in areas with large temperature difference and great influence of climate and environment.

The difference: The electric field.

In the electric field treatment of cold shrinkable termination, geometric method is used to change the distribution of electric field through stress cone, which is solved by a certain geometric shape and precise Angle. This method is easier to control and test. It can be ensured and implemented in the factory. The electric field treatment method of heat shrinkable termination is to change the distribution of electric field by linear parameter method, which must rely on two important parameters: A: volume resistance,108-11 ω; B: the dielectric constant is 25; Due to its complex production process, the environmental factors change greatly, so it is difficult to control the stability of parameters, so the product quality stability will be affected.

Cold Shrinkable Termination Kit


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