National standard extended conductor LGKK-600 800 900 1400 high zinc steel core aluminum stranded wire

Description :

　　 National standard extended conductor LGKK-600 800 900 1400 high zinc steel core aluminum stranded wire

　　Introduction to the use of extension wires:

　　 When the voltage of the line exceeds 220KV, in order to reduce the line reactance and corona losses, expanded diameter wires are usually used. Expanding the diameter of a wire is to make an ordinary wire hollow (with multiple steel core wires and support layers inside) or reduce the number of single wires in some layers (so that there are a certain number of gaps between the single wires in that layer), ultimately achieving the goal of increasing the equivalent radius of the wire.

　　Expanded diameter conductors have great potential for application in ultra-high voltage and extra high voltage transmission projects, especially in high-altitude areas with broader prospects.

　　Usage Classification

　　 Expanded conductors can be divided into two categories based on their usage: one type is used in substations, and the other type is used in transmission lines. In order to reduce sag and tower height, the tension to weight ratio of the expanded diameter conductor used in transmission lines should be equivalent to that of steel cored aluminum stranded wire. Therefore, this type of expanded diameter conductor must have a steel core. Because the expansion wire used in transmission lines must be tensioned, and after passing through several pulleys during the tensioning process, it is required to have no jumping or loosening of strands. Therefore, the stability of the structure of this expansion wire is higher, and the expansion ratio of this expansion wire should not be too large. The main function of using expanded diameter conductors in substations is to direct current from transformers to transmission lines, usually only a few tens of meters away, without considering issues such as sag and tension. Due to the fact that the number of splits in substation busbars is usually smaller than the number of splits in line conductors, and given similar environmental limits for electromagnetic noise, it is required that the outer diameter of substation busbars be much larger than that of line conductors. Therefore, the characteristic of this type of expanded diameter conductor is that it has no steel core, but the expansion diameter is relatively large.

　　Classified by structural characteristics

　　 According to the structural characteristics of expanded diameter wires, they are divided into four categories: large inner diameter aluminum tube supported expanded diameter wires, small inner diameter aluminum tube filled expanded diameter wires, sparse twisted expanded diameter wires, and high-density polyethylene supported expanded diameter wires.

　　 Small inner diameter aluminum tube filled expanded diameter wire. This type of expanded diameter wire is made by twisting multiple small inner diameter aluminum tubes (instead of aluminum single wires) outside the steel core. Large inner diameter aluminum tube supported expanded diameter wire. This type of expanded diameter wire has no steel core and is made by twisting multiple layers of aluminum single wires on a large inner diameter aluminum tube. Sparse twisted expanded diameter wire, high-density polyethylene supported expanded diameter wire.

　　Characteristics of Radial Conductors

　　 Expanded diameter conductor refers to a conductor with an enlarged outer diameter compared to a concentric twisted hollow conductor with a similar cross-section. There are many types of expanded diameter conductors with significant structural differences, but they can be divided into two categories based on their use: for substations and for transmission lines. Expanded diameter wires have the following characteristics:

　　(1) Compared with conventional wires of the same cross-section, the outer diameter of the expanded wire increases, the corona loss decreases, and the radio interference and audible noise derived from corona also decrease, effectively improving the electromagnetic environment and benefiting environmental protection.

　　(2) Compared with conventional wires with the same outer diameter, the aluminum cross-section of the expanded wire is reduced, saving aluminum material and reducing the weight of the wire. This not only reduces the amount of wire used, but also reduces the steel consumption of the tower due to the decrease in tower load, thereby reducing the investment in transmission line engineering.

　　(3) Compared with conventional wires with the same outer diameter, expanded diameter wires have the same corona characteristics due to the same outer diameter of the wires. [1]

　　Selection of Expanding Method

　　Determine the wire cross-section based on the conveying capacity, determine the outer diameter of the wire based on electromagnetic environment control indicators, and consider expanding the diameter after the wire cross-section and outer diameter are clear. When choosing the expansion method, the first consideration should be the economy. Based on preliminary calculations, the cost of the sparse twisted expanded diameter wire is lower than that of the high-density polyethylene supported expanded diameter wire, and the project cost is lower if the sag characteristics are better, which shows that the investment for sparse twisted expanded diameter wire of the same specification is lower. Secondly, the stability of the structure should be considered.

　　 For sparse twisted expanded diameter conductors, the expansion ratio of 310K400 is 1.29, and the expansion ratio of 400K500 is 1.20. Engineering practice has proven that its structure is stable; The expansion ratio of 630K720 is 1.14, and the test proves that its structure is stable. This wire underwent engineering deployment tests on the Yongdeng Baiyin 750 kV transmission line in March 2009. However, the expansion ratio of 500K630 is 1.26630K800, 1.27720K900 is 1.25, and analysis suggests that all three structures are unstable. It can be seen that with the increase of conductive cross-section, the expansion ratio shows a downward trend while maintaining structural stability. Therefore, the expansion ratio alone cannot be used to select the expansion method. In actual transmission projects, when choosing the wire expansion method, the size of the conductive cross-section needs to be taken into account.

　　In short, the expansion method should prioritize the sparse twisted type but also ensure the stability of the wire structure.

　　 National standard extended conductor LGKK-600 800 900 1400 high zinc steel core aluminum stranded wire

　　 Dazheng Electric Wire Co., Ltd. is one of the main production enterprises of wires, wires, cables, and optical cables in China. It is a modern enterprise engaged in the production, research and development, and sales of high-tech products such as wires, wires, cables, and optical cables. The company was established on May 16, 2007 and is located in Dazheng Industrial Park, Renqiu City, Hebei Province. It is situated in the center of Shijiazhuang, Beijing, and Tianjin, the provincial capital of Hebei Province, and is close to the beautiful North China pearl Baiyangdian, as well as the Daguang Expressway, Jinghu Expressway, Jinshi Expressway, 106 National Highway, Beijing Kowloon Railway, and Jinbao Highway running through the city, making transportation very convenient. The company covers an area of 13508 square meters, with a building area of about 8000 square meters and more than 200 employees, including 30 technical personnel. The registered capital is 105 million yuan, the fixed assets are 300 million yuan, and the annual production capacity is 900 million yuan. In 2016, the output value of aluminum products reached 120 million yuan. The company has six modern production workshops and more than 50 sets of production and inspection equipment. The production and testing equipment is advanced and complete, mainly including frame twisting machines, 1+1 cross-linking extruders, Shenma 630 tube twisting machines, 630 cage twisting machines, cold press welding machines, aluminum large pulling machines, tube twisting machines, extruders and other advanced production equipment such as DC bridges, metal tensile testing machines, electronic scales, wire winding and twisting testers, adhesion testers, etc. Testing equipment such as sexual experimental devices. Production: Overhead insulated conductors, steel cored aluminum alloy conductors, heat-resistant steel cored aluminum alloy stranded wires, steel cored aluminum stranded wires, aluminum clad steel cored aluminum stranded wires, OPGW conductor optical cables, OPPC composite phase line optical cables, steel stranded wires, aluminum clad steel stranded wires, cross-linked power cables, control cables and other products. Some products have a large inventory and can be shipped quickly.

　　Dazheng Electric Wire Co., Ltd. has been awarded multiple honorary titles such as provincial and municipal contract credit enterprises, consumer trustworthy units, and Hebei Province measurement qualified units for many years, thanks to advanced production equipment and exquisite technical processes, complete testing equipment and perfect testing methods, modern scientific management methods, and rigorous quality assurance systems. It has cooperated with state-owned enterprises such as China Petroleum Corporation, Hebei Construction Investment Group, State Grid Corporation of China, and Wind Power Investment Group, and has received high praise from customers for its excellent product quality and service. The development strategy of Dazheng Electric Line is to adhere to the development concept of "quality excellence, integrity pursuit forever", adhere to the development path of "strict quality, efficient management, keeping pace with the times, technological innovation, environmental protection and consumption reduction", improve scale efficiency, develop products, create the Dazheng Electric Line brand, serve China's power industry, and contribute to society!

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