Recently, the world's first 110 kV grafted modified polypropylene insulated environmental protection cable developed by the Power Science Research Institute of Guangdong Power Grid Company successfully passed all type test tests in the National wire and Cable Quality Inspection and testing Center, and the performance indicators all met the product design requirements. It marks the successful development of the world's first high voltage grade grafted modified polypropylene environmental protection cable by China's master of original technology and independent intellectual property rights.
In recent years, the Southern Power Grid Company has increased scientific and technological research efforts, focusing on the key core technology research of the localization of cable insulation materials. At the beginning of 2023, the 10 kV and 35 kV grafted modified polypropylene environmental protection cables led by the Southern Power Grid Company were successively put into engineering application for the first time. However, the high voltage grade graft modified polyacrylic cable has more stringent requirements for the cleanliness of materials and the transformation of cable production line, and the finished cable needs to meet the micro-pore impurities, eccentricity and other indicators, and the related process control is more difficult after the insulation thickness increases.
"In order to tackle the research and application of higher voltage grade environmental protection cables, Southern Power Grid Company has set up a cross-unit, cross-professional joint research team together with Tsinghua University, Sinopec, Zhongtian Technology and other industry-university-research units." "Guangdong Power Grid Company electric power Research Institute power transmission Institute cable expert Yu Xin introduced that the project team optimized the cable material formula and preparation process, for the first time in the world to use advanced water phase floating grafting technology to optimize the structure and performance control of polypropyl materials, transform the 110 kV cable production extrusion, cooling and other key equipment, to solve the polypropylene cable three-layer co-extrusion, It has broken through the key technologies of polypropylene cable material system, industrial preparation and cable extrusion process.
The type test verifies that the conductor of the cable system can reach 105° C for a long time, which is compared with the traditional crosslinked polyethylene wire with a long time operating temperature of 90° C. The current carrying capacity can be increased by more than 10% to effectively solve the problem of "stuck neck" in the transmission capacity of some cable lines, which provides important support for the green economic operation of medium and high voltage cables in China's power grid. It also further validates the grafting modification technology of polypropylene materials and the processing performance of polypropylene cables as the basis for the development of higher voltage grade environmental protection cables.
China Southern Power Grid Company 110 kV graft modified polypropylene cable technology breakthrough, is a successful practice of original technology research and development and application in the field of comprehensive color cable materials and equipment in China, will drive cable raw materials and power cable technology innovation, is conducive to the establishment of a domestic green cable market ecology, Peng Xiangyang, a professional technical expert of China Southern Power Grid Company, introduced the production of chemically modified limited-propylene insulation material for the new environmental protection cable. Compared with the conventional cross-linked polyB # insulated cable, it has the characteristics of low production energy consumption, high operating temperature, no cross-linked by-products, recyclable, etc., and has good social and economic benefits and promotion value. Futai new power system equipment green and low-carbon development trend, is one of the important technical directions of the cable industry.
Next, the Southern Power Grid Company will further carry out polypropylene edge terminal engineering applications and more types of environmental protection cable research and development, to inject strong impetus for the construction of new power systems and energy transformation and upgrading.
