Mechanical properties of cold shrink cable accessories
【Abstract】The cold shrinkable cable accessories can complete the insulation and straight-through connection of the cable shielding layer according to the needs of users. The conductors in the cable joints are crimped by hexagonal die according to the regular tonnage, with small touch resistance and strong mechanical strength, which can fully meet the needs of normal operation and short-circuit operation of the line. |
Cold-shrinkable cable accessories can complete the insulation and straight-through connection of the cable shielding layer according to user needs. The conductors in the cable joints are crimped by hexagonal die according to the regular tonnage, with small touch resistance and strong mechanical strength, which can fully meet the needs of normal operation and short-circuit operation of the line.
Excellent physical and mechanical properties of cold-shrinkable cable accessories: cable accessories_long materials generally speaking, the tensile and tear strength of general silicone rubber is relatively low, if the tensile and tear resistance of silicone rubber is to be improved, the elongation will decrease, and the hardness will increase; while the silicone rubber used to make cold-shrinkable electrical cable accessories needs to have high elongation, low hardness and high tensile and tear strength, that is, elongation The rate is 800%, the Shore A hardness is 45 degrees, the tensile strength reaches 10MPa, and the tearing reaches 30kN/m.
The product of cold shrinkable cable accessories should reach 1A3.5 level in order to resist electric leakage and tracking. Usually, the way to improve the tracking resistance of silicone rubber is to increase the aluminum hydroxide; however, after many additions of these fillers, the hardness of the silicone rubber will inevitably increase and the elasticity will be reduced. The company has developed advanced technology to make the tracking resistance of silicone rubber reach level 4.5 without affecting the hardness, elasticity and expansion capacity of silicone rubber. And this technology also makes the silicone rubber have a strong hydrophobic ability, rainwater on the cold-shrinkable cable terminal made by it can neither adhere to the film, nor form a conductive channel; instead, it can wash away its surface. grey layer. That is, the electrical performance of the cold-shrinkable cable terminal can be significantly improved, and the use and exploration of heat-shrinkable cable accessories can achieve a relatively large flash leakage interval within a relatively short dark group.
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