Guangzhou Liwan District 110 kV Transmission Line Anti-corrosion and Energy-saving Project
In the urban power grid structure of Liwan District, Guangzhou City, the 110 kV Pannan Source B Line transmission line undertakes an important power transmission task. Part of this line is located in a high-voltage cable tunnel 5 meters underground, with a total length of 1.47 kilometers. Due to the cable being in a damp underground environment rich in corrosive substances for a long time, the metal armor layer faces severe corrosion risks. Once corrosion causes perforation, it will lead to a decline in insulation performance, triggering line faults and seriously threatening power supply stability. At the same time, traditional cross-linked polyethylene insulated cables have high energy consumption during production and are not environmentally friendly.
In the urban power grid structure of Liwan District, Guangzhou, the 110 kV Pannan Source B Line transmission line undertakes an important power transmission task. Part of this line is located in a high-voltage cable tunnel 5 meters underground, with a total length of 1.47 kilometers. Due to the cable being in a damp and corrosive underground environment for a long time, the metal armor layer faces severe corrosion risks. Once corrosion causes perforation, it will lead to a decline in insulation performance, triggering line faults and seriously threatening power supply stability. At the same time, traditional cross-linked polyethylene insulated cables have high energy consumption during production and are not environmentally friendly.
After in-depth research, Guangzhou Hisense Meike New Materials Technology Co., Ltd. provided an innovative solution for this transmission line. For cable protection, a nano-coating technology with excellent anti-corrosion performance was adopted. This nano-coating can form a dense protective film on the surface of the cable's metal armor layer, effectively blocking moisture, corrosive gases, and various chemical substances from erosion. Its special molecular structure also has a self-healing function, allowing it to automatically repair minor surface damage and continuously maintain protective effects. Regarding insulation materials, Hisense Meike promoted the application of non-cross-linked green polypropylene insulation materials. Compared with traditional cross-linked polyethylene insulated cables of the same specifications and voltage levels, polypropylene insulation materials have significant advantages. From raw material processing to cable manufacturing, carbon dioxide emissions can be reduced by about 6.2 tons, strongly promoting green and environmentally friendly production. The production cycle of cable insulation processes is shortened by 80%, greatly improving production efficiency, and energy consumption is reduced by more than 40%, achieving energy-saving goals.
During the project implementation, Hisense Meike's professional team closely cooperated with the construction unit. First, the surface of the cable's metal armor layer was finely treated to ensure the nano-coating could firmly adhere. Advanced spraying equipment and processes were used to evenly cover the nano-coating on the cable armor surface, with the coating thickness strictly controlled within the optimal range to ensure protective performance. For the laying of polypropylene insulated cables, construction standards were strictly followed to ensure installation quality. After the project was completed and put into operation, continuous monitoring for one year showed no signs of corrosion on the cable's metal armor layer, stable and reliable insulation performance, and no line faults caused by cable issues. Meanwhile, the line achieved remarkable results in energy saving and environmental protection, providing strong support for the stable and green operation of the urban power grid and serving as an excellent model for similar transmission line projects.
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