The importance of cable accessories in power transmission

Cable accessories are an integral part of the cable line, and cables cannot work without accessories. Cable accessories provide an important guarantee for the seamless and safe connection of the middle and terminal of various cables in the cable line. Together with the cables, it forms the power delivery network. According to the characteristics of the cable structure, the cable accessories can not only restore the performance of the cable, but also ensure the extension of the cable length and the connection of the terminal. At the same time, the connection of cable accessories is also the weakest link in the entire line. Therefore, the quality of cable accessories is of great significance to the safe operation of the entire cable line. When installing the cable accessories, the original insulation, sealing and shielding of the cable must not be damaged. Therefore, the function of the cable accessories is to restore the original conductive core of the cable, and restore the functions of insulation, shielding, and sealing protection.

The basic requirements of cable accessories are: reliable insulation, good sealing performance, good electrical conductivity, high enough mechanical strength, corrosion resistance, flame retardant, and good thermal performance.

Main requirements:

1. The connection resistance is small and the connection is stable, which can withstand the impact of fault current;

2. After long-term operation, its contact resistance should not be greater than 1.2 times of the resistance food of the same length of the cable core body;

3. It should have certain mechanical strength, vibration resistance and corrosion resistance.

Cable accessories are divided into cold shrink cable accessories and heat shrink cable accessories.

Cold Shrink Cable Accessories:

 The raw material used in the cold-shrinkable cable accessories of Suzhou Jiuwei Electric Manufacturing Co., Ltd. is imported liquid silicone rubber, which has excellent insulation and high elasticity. There is no electrical breakdown due to respiration of the cable during operation. The cold-shrinkable cable accessory device is easy to operate, and the construction does not need to be heated, which saves time and effort, and greatly reduces the quality accidents caused by improper operation.

Heat Shrink Cable Accessories:

Heat-shrinkable cable accessories are commonly known as heat-shrinkable cable heads, which are widely used on the terminals of cross-linked cables or oil-immersed cables with voltage levels of 35KV and below. It is used in various fields of the national economy such as electric power, petrochemical, railway, port, metallurgy and so on. Compared with the traditional cable accessories, it has the characteristics of small size, light weight, safety and reliability, moderate price and convenient installation.

The heat shrinkable products of Suzhou Jiuwei Electric Manufacturing Co., Ltd. meet the GB11033 standard, the long-term use temperature range is -55℃~105℃, the aging life is up to 20 years, the radial shrinkage rate is ≥50%, and the longitudinal shrinkage rate is less than 5%. The shrinkage temperature is 110℃~140℃.

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