On December 5, it was learned from the Power Science Research Institute of Guangdong Power Grid Company of Southern Power Grid (hereinafter referred to as the Power Research Institute) that the new 110kV grafted modified polypropylene insulated eco-friendly power cable, led by the institute, has successfully passed all type tests and inspections. All performance indicators have met the product design requirements. This marks the successful development of high-voltage level grafted polypropylene eco-friendly power cables with original technology and independent intellectual property rights in China.
Earlier this year, the 10kV and 35kV grafted polypropylene eco-friendly power cables developed by Southern Power Grid Company were successively put into engineering applications. However, due to the more stringent requirements for the cleanliness of materials and the transformation of cable production lines for high-voltage level grafted modified polypropylene insulated cables, the finished cables need to meet indicators such as micropore impurities and eccentricity, and the control of related processes is more difficult after the insulation thickness increases.
To tackle the research and application of eco-friendly power cables at higher voltage levels, Southern Power Grid Company has formed a cross-unit, cross-disciplinary joint tackling team in conjunction with Tsinghua University, Sinopec, Zhongtian Technology and other industry-university-research-application units.
According to Yu Xin, a cable expert from the Transmission Institute of the Power Research Institute, the team optimized the cable material formula and preparation process, used advanced water-phase suspension grafting technology to optimize the structure and performance control of polypropylene materials, transformed key equipment such as 110kV cable production extrusion and cooling, solved problems such as three-layer co-extrusion and internal stress control of polypropylene insulated cables, and made breakthroughs in key technologies such as the polypropylene cable material system, industrialized preparation and cable extrusion process.
After type test verification, the conductor of this cable system can operate at a long-term temperature of 105℃. Compared with the traditional cross-linked polyethylene cable with a long-term operating temperature of 90℃, the current carrying capacity can be increased by more than 10%, effectively solving the bottleneck problem of some cable line transmission capacity, providing important support for the green economic operation of medium and high voltage cables in China's power grid, and further verifying the grafting modification technology of polypropylene materials and the processing performance of polypropylene cables, laying the foundation for the development of eco-friendly power cables at higher voltage levels.
Peng Xiangyang, a special professional technical expert of Southern Power Grid Company, said that this new type of eco-friendly power cable is produced using chemically modified polypropylene insulation materials, has low production energy consumption, high operating temperature, no cross-linking by-products, recyclable and other characteristics, has good social and economic benefits and promotional value, conforms to the green and low-carbon development trend of new power system equipment, and is one of the important technical directions in the cable industry. Article translation summary.
