Development Status and Application Prospects of Energy-saving Wires
As the pace of national power grid construction continues to accelerate, our country attaches great importance to the construction of the power grid based on the ever-increasing power demand. For this reason, China has successively introduced a series of policies to accelerate the development of electric power. Zhang Ziyin, deputy director of the Design Information Company of the State Grid Economic and Technical Research Institute, once stated that energy-saving is very important in power grid construction, and energy-saving conductors such as medium-strength aluminum alloy wires have relatively good application prospects. State Grid Corporation of China began to comprehensively promote the implementation of two types of three new technologies (ie, resource-saving, environment-friendly, new technologies, new materials, and new processes) from 2009, and on the premise of ensuring reliable functions of transmission lines, saving corridor resources and improving lines. Transmission capacity, reduce the overall cost of construction and operation, and vigorously promote energy-saving wire. Since the beginning of this year, China's pilot project for energy-saving conductors is in full swing. According to sources, the National Grid plans to fully promote energy-saving wires in 2014 and strive to achieve energy-saving wire replacement of ordinary ACSR at an early date. At the same time, along with the application of the National Grid Corporation's energy-saving conductor pilot promotion, the demand for energy-saving wires has soared. As early as 2012, the State Grid Corporation of China carried out pilot applications for energy-saving conductors such as medium-strength all-aluminum stranded wires, and achieved comprehensive benefits. In 2013, the State Grid Corporation of China comprehensively considered factors such as the production capacity and quality control of energy-conserving conductors, used transmission line projects with a high number of hours to carry out pilot projects for expansion, and improved the quality control guarantee mechanism for energy-saving conductors. In the afternoon of October 28th, outside the 220kv transformer substation of Huinong 220kv in the Ningxia Shizuishan hub power station, Ningxia Power Grid completed the erection of the first new energy-saving conductor pilot line—Henong Baofeng 110 kV line. With the successful access of the line to the Huinong 220 kV substation, the first pilot line of the new energy-saving conductor in Ningxia Power Grid will be officially put into operation. The first energy-saving conductor in the Ningxia Power Grid used medium-strength aluminum alloy strands, which was also the first time in the northwest region. At present, most of the transmission lines in China still use ACSR with a conductivity of 53%, while the energy-conserving conductors (all-strength aluminum alloy strand) have a 5.5% higher conductivity than steel stranded conductors and have a transmission capacity. Large, low resistance loss, corrosion resistance, low engineering cost and other advantages. According to statistics, the loss of power transmission and distribution lines in the country amounts to 171 billion kWh, which is approximately 59.85 million tons of standard coal. If the domestic 20% of transmission lines adopt this energy-saving technology, the annual loss of the line can be reduced by more than 1 billion degrees, and 36 million tons of standard coal can be saved. According to a power professional, the medium-strength all-aluminum alloy strands were treated with a special process, which greatly improved the creep resistance and reduced the chance of accidents due to creep. All of the aluminum alloys used in the structure were made of conductive aluminum alloy. Single strands are concentrically stranded. In this structure, the aluminum alloy wire simultaneously assumes the role of conductive and reinforcing core, and can completely replace the steel core and other additional reinforcing elements. In addition, the wire has no hysteresis loss and eddy current loss when used. At the same time, the problem of reducing the service life of wires due to electrochemical corrosion between different materials is also solved. The new type of energy-saving wire can be said to have many advantages. Not only does it have a relatively long service life, but in the same line corridor, the transmission capacity of the wire will increase by 5% to 10% over the existing conventional wire, and the current capacity will increase by about 5%. In contrast, the utilization of wire resources has been greatly improved, and the cost of the project has also been reduced by about 3,000 yuan per ton compared with the conventional wire.
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