At 11:32 on June 5th, with the first primary power transmission success of Laiyang 500kV Substation, the first power grid project using carbon fiber conductors in Shandong Province, Laiyang-Kunyu 500kV line project was completed and put into operation.
The Laiyang-Kunji 500-kilovolt line project, starting at the 500-kilovolt Laiyang substation and ending at the 500-kilovolt Kunyu substation, is one of the first seven demonstration projects of carbon fiber conductors in China. The total length of the line is 122.842 kilometers. It passes through Laiyang and Haiyang in Yantai, Rushan and Wendeng in Weihai to form a total of 292 base towers. The entire line uses 4 × JLRX1 / F1A-710 / 55 carbon fiber composite core conductors, and the conductor cross section is 710 mm . Among the first seven demonstration projects of carbon fiber conductors in the country, the Laiyang-Kunming 500 kV line project has the longest construction distance, the largest conductor cross section, and the most difficult construction in mountainous areas.
Carbon fiber composite conductor is a new type of energy-saving capacity-enhancing conductor. It consists of a carbon fiber core rod and an outer layer of aluminum wire. The carbon fiber composite core replaces the traditional steel core. The tensile strength can be increased by 1-2 times. Safety factor; the composite material core wire has a small expansion coefficient and a small line sag, which can reduce the crossover distance of the conductor, reduce the height of the tower, and reduce the footprint of the tower foundation; the unit length and weight are about 10% lighter than conventional steel core aluminum stranded wires , Can reduce the weight of the iron tower; the composite core is a non-magnetic material, there is no magnetic loss and thermal effects, which can reduce the transmission loss, and has a lower operating temperature, which can greatly increase the current carrying capacity; the composite core wire does not rust and has a longer service life , The outer edge is compact and smooth, it is not easy to accumulate snow, and it can melt snow and ice when running at high temperature. The unique series of advantages of carbon fiber composite conductors comprehensively solve the technical bottlenecks in the field of overhead power transmission, represent the future technical development trend of overhead conductors, and help build a safe, environmentally friendly, efficient, and economical transmission network.