Overhead power lines to increase the span, widely used on conventional ACSR. In order to further increase the transmission traffic, people seeking to develop lightweight, high strength, low sag, corrosion resistance, low line loss of the new cable. Since the 1990s, the United States, Japan has successfully developed carbon fiber composite core overhead wire, has been applied in engineering. Our imports from the United States for such a wire transmission project. At present, Jiangsu, Beijing, Liaoning and other places have started independent research and development.
ACSR full advantage of high mechanical strength and electrical conductivity of aluminum and steel, the structure of the Department of aluminum wire parcel or more strands of wire or strand. Steel core aluminum wire from the atmosphere of harmful gases (such as nitrogen oxides, sulfur dioxide) erosion. Bear mechanical stress steel core, aluminum wire supplying electric power to assume the function. Since the aluminum wire located in the outer conductor, the principle known by the skin effect, the higher the efficiency of this wire. There is a core material of aluminum wire slight wobble when the wind, wire faults even less likely to play, which is smaller than the sag coreless aluminum wire nearly 50%, in favor of safe operation of the circuit.
Manufacturing process based carbon fiber composite core using pultrusion. Optional carbon fiber T700S (tensile strength 4900MPa, tensile modulus 230GPa, elongation at break of 2.1%, a density of 1.80g / cm3), the substrate may be a low viscosity, good heat resistance and toughness of epoxy resin. Wuhan University of Technology to develop the production of epoxy resins, low viscosity, glass transition temperature Tg190 ℃.
Insulation and prevent electrochemical corrosion, carbon fiber composite core outer surface to be wound glass fiber reinforced plastics or basalt fiber reinforced plastics.
According to the analysis, strength core aluminum stranded carbon fiber composite material is 2 times the normal conductor, due to the use of carbon fiber composite core accounts for only 1/4 of the steel core, can reduce the overhead line tower load, greatly reducing installation period, improve security . Especially in the absence of magnetic losses or heat wires caused a small transmission loss, energy-saving effect is considerable. Development of carbon fiber composite core wire will become a new economic growth point of the composite materials industry.
Earlier this year, southern China snowstorm to the national economy and bring great suffering and economic loss, transmission tower distorted in some areas even collapse wounding. In view of this, our country is developing a carrying capacity can be increased and to reduce the load of new carbon fiber composite core tower overhead wires.