Classification Differences and Manufacturing Processes of High-Voltage Cable Terminations
Dec 26,2022
High-voltage cable joints are an indispensable component of cable lines. They are used to connect two high-voltage cables and help improve the electric field at the cable ends. Sometimes, they also include cable termination connectors and connectors at both ends of the cable, which are used to connect to other equipment and lines. This will help you understand the manufacturing process of high-voltage cable joints.
The design principles for all cross-linked cable terminations shall adhere to the principle of restoring the original structure of the cable body. Therefore, the design concept of their connectors should comply with the electrical standards specified in China’s GB12706-4 and IEC 60502-4:1997, meeting the required electrical, physical, and chemical performance criteria to ensure the long-term reliable operation of the cable terminations and the safe operation of electrical equipment.
High-voltage cables are components that connect cables to other electrical equipment. The connector material used at the terminal ends is referred to as cable accessories. Cable accessories should maintain the same level of safety as the cable itself over the long term and have a service life equivalent to that of the cable. High-quality cable accessories should feature excellent conductor connections, with key characteristics including low connection resistance, stable connections, and the ability to withstand the impact of fault currents. After prolonged operation, the contact resistance must not exceed 1.2 times the resistance of an equivalent-length section of the cable itself.
Commonly used processes include:
1. Cold-shrink cable terminal.
Heat-shrink cable terminal.
c. Specialized plug-in equipment for high-voltage cables (typically connected to device-specific sockets, often used in special environments—such as tunnels—where working conditions are complex, cable accessory fabrication is inconvenient, and voltage levels are low).
d. High-voltage cable junction box (cable connection or cable split into two, three, or 10 kV junction boxes)
Cable terminations have high requirements for waterproofing, moisture resistance, and gas tightness. The accessories for fully cold-shrink power cables are, in fact, elastic cable accessories. They possess excellent elasticity, which helps prevent the high-voltage cable from expanding and contracting due to atmospheric conditions and load variations during operation—thus avoiding insulation breakdown accidents caused by the "cable breathing" effect and resulting insulation gaps. By contrast, heat-shrink accessories lack elasticity and cannot "breathe" along with the cable. Therefore, fully cold-shrink accessories are better suited for regions with large temperature fluctuations and significant climatic influences than heat-shrink cable terminations.
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