Application of the hottest basalt fiber in transmi

2022-08-23
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Application of basalt fiber in power transmission lines

basalt fiber is a kind of widely used artificial inorganic fiber. Its structure and performance are similar to glass fiber, but it is superior to glass fiber in mechanical strength, high temperature resistance, water vapor resistance, corrosion resistance, thermal insulation and sound insulation. It will not release toxic substances in air and water for the majority of graduates to taste and read. It has good smoldering performance and mechanical properties, and becomes the parent material of soil after degradation, Therefore, basalt fiber has become the focus of current application research

electric power ⑥ can detect the shear modulus G value and yield point of the specimen τ s. Upper yield point τ Su, lower yield point τ SL, torsional strength τ B and other industries, because of their high requirements for materials in electric construction, the use of new materials can not only enhance physical strength and ensure power supply reliability, but also be of great significance in increasing transmission efficiency, reducing transmission losses, and living in harmony with the environment. As a new promising green material, basalt fiber will have great potential in electric construction

I. application in tower foundation

reinforced concrete is the main material for the tower foundation of UHV transmission lines. Reinforcement is easy to rust in cement for a long time, causing damage to the infrastructure. In the 1990s, foreign countries began to use glass fiber reinforced reinforcement to replace reinforcement. Research shows that the tensile strength of glass fiber is higher than that of reinforcement, and the corrosion by cement is lower than that of reinforcement. Therefore, it is for buildings, bridges, highways and parking lots directly exposed in coastal areas that are vulnerable to sea water and sea breeze, It can better reflect the superior characteristics of glass fiber reinforced reinforcement. Basalt fiber has better alkali resistance than glass fiber and higher tensile strength, which can prolong the service life of concrete products. Therefore, it has a broad application prospect in cement-based composites

compared with the traditional reinforced concrete foundation, when the wear of the leaf spring of the basalt fiber reinforced tower exceeds 10%, the rod foundation has the following advantages:

1, strong corrosion resistance, especially suitable for coastal, northwest and other high saline alkali areas

2. It has strong mechanical properties and is suitable for severe geological conditions to ensure that the tower foundation will not overturn, sink or pull up

3. It has higher requirements for the stability of coordination, which is more environmentally friendly and energy-saving, avoids secondary pollution, and is conducive to the construction of green electricity

II. Insulating clothing for live working

because basalt fiber has good insulation, flame retardancy, high temperature resistance, thermal insulation and no toxic gas emission, it is suitable for making insulating clothing for live working in power system with voltage level of 10kV and below. Considering the high density and poor permeability of basalt fiber, it can be blended with other fibers to improve the comfort of insulating clothing. In addition, the fire protection clothing made of basalt fiber not only has the high temperature resistance and thermal insulation of general fire protection clothing, but also its excellent insulation is conducive to close to live equipment for fire extinguishing

III. application of new composite core conductor

for high-voltage distribution lines with voltage levels of 220kV and below, the main reason restricting the transmission capacity of the line is the thermal stability limit, that is, the allowable temperature rise of the conductor. For the traditional steel cored aluminum stranded wire (ACSR), China's regulations stipulate that the maximum allowable operating temperature is 70 ℃, which is the highest limit established considering the "recrystallization annealing effect" of steel cored aluminum stranded wire and the allowable sag of conductor thermal expansion. ACSS (invar aluminum alloy conductor) has made progress in transmission capacity compared with ACSR (steel cored aluminum stranded wire). However, aluminum alloy conductor containing zirconium has high resistivity, and the resistivity increases nonlinearly with temperature. Compared with the traditional conductor, the loss increases significantly, and the metal as the core increases the hysteresis loss. Invar core and aluminum are prone to electrochemical corrosion

the carbon fiber composite core conductor made of carbon fiber and basalt fiber, with fully annealed soft aluminum as the conductor, has the following characteristics:

1, high strength. The tensile strength of ordinary steel wire is 1240mpa, the tensile strength of high-strength steel wire is 1410mpa, and the tensile strength of composite core wire mixed with carbon fiber and basalt fiber can exceed 2200mpa

2. Light weight. The density of composite core material is about 1/4 of that of steel. Taking the span of 500m as the calculation, the vertical load of tower pole can be reduced by about 750KG, so as to save tower materials and reduce investment

3, low loss. Because there is no eddy current magnetic loss of steel wire, the loss of transmission line itself is reduced, so the operation cost is reduced

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