Advantages of cold shrink cable accessory performance:
Cold shrinkable cable accessories have the advantages of small size, easy operation, speed, no special tools, wide application range and few product specifications. In contrast to heat-shrink cable accessories, no heat is required and there is no risk of disconnection between the internal layers of the attachment as is the case with heat-shrinkable cable accessories (because cold-shrinkable cable accessories rely on elastic pressing forces).
However, no product is perfect, and cold shrinkable cable accessories have their own limitations, which are manifested in:
First, the specifications of cold-shrinkable cable accessories are limited, and it cannot be made too small, so that the application is limited in low-voltage cable accessories, especially small square sections are almost impossible.
Second, for oil-immersed cable cold shrinkage is not applicable, it can not block the oil, limiting the application of cold shrinkable cable accessories on oil-immersed cable.
Third, its price is about 5-6 times that of heat shrinkable cable accessories, and it will not be preferred in some economic occasions.
20kV three-core intermediate connector
Heat shrinkable cable accessories also have their irreplaceable features:
Voltage class cross-linked cables or oil-immersed cables on intermediate connections and terminals. Compared with traditional cable accessories, it has the characteristics of small size, light weight, safety and reliability, and easy installation. The product conforms to GB11033 standard, the long-term use temperature range is -55 °C ~ 105 °C, the aging life is up to 20 years, the radial shrinkage rate is ≥50%, and the longitudinal shrinkage rate <5%, the shrinkage temperature is 110 °C ~ 140 °C.
The materials used are generally composed of polyethylene, ethylene-vinyl acetate (EVA) and ethylene propylene rubber and other material components. This type of product mainly uses stress tube to deal with the problem of electrical stress concentration. That is, the parameter control method is used to alleviate the stress concentration of the electric field. The main advantages are lightweight, easy installation and good performance. Cheap.
1kV cold shrink cable accessory
Concentrate:
The stress tube is a kind of heat shrinkable tube with moderate volume resistivity (1010-1012Ω?cm) and special electrical parameters with large dielectric constant (20--25), and the electrical parameters are used to force the stress evacuation at the break of the cable insulation shield to a more uniform distribution along the stress tube. This technology can only be used in cable accessories up to 35kV. Because the stress tube will heat up when the voltage level is high, it will not work.
From a technical point of view, the performance of cold shrinkable cable accessories is mainly reflected in its partial discharge characteristics, and the comprehensive performance of heat shrinkable cable accessories has certain advantages. In terms of installation, the installation time of cold shrinkable cable accessories is shorter than that of heat shrinkable cable accessories, and power can be sent after installation, and cold shrinkable cable accessories have some relative advantages. In summary, it is unlikely that cold shrinkable cable accessories will completely replace heat shrinkable cable accessories, click to see the difference between cold shrinkable cable accessories and heat shrinkable cable accessories.
10kV cold shrinkable cable accessory
Here to remind users: to choose the type of cable accessories according to their own industrial and mining conditions. Any product exists, there is a reason, complete death, is unlikely. In fact, cable accessories such as poured and wrapped have been used for nearly fifty years, but they are still in use.
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