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.
From 2009, the State Grid Corporation of China began to comprehensively promote the implementation of "two types of three new" (ie, resource-saving, environment-friendly, new technologies, new materials, and new processes), saving corridor resources on the premise of ensuring the reliability of transmission lines. Improve the transmission capacity of the line, reduce the overall cost of construction and operation, and vigorously promote energy-saving wires.
Since the beginning of this year, China's energy-saving conductor pilot project construction has been "overwhelming." 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 structure of the core barrel is generally divided into single - acting double core tube and most of the fishing apparatus. The double tube section consists of an outer tube assembly and an inner tube assembly. The outer pipe assembly includes; The main structure and working principle of the cartridge stopper, cartridge chamber, stable joint outer pipe, diamond reamer and diamond bit are as follows:
(1) Spear structure is composed of spear head and recovery spring. When coring, the fishing device is lowered to the upper part of the inner tube assembly in the drill pipe, and the fishing hook grasps the fishing spear, lifts the fishing device up, picks up the recycling card barrel, and inwardly compressing the cartridge card, so that the inner tube assembly and the outer tube are separated, so that the inner tube assembly is lifted up.
(2) The clip structure is mainly composed of the clip frame, clip, spring and other components. Its function is that when the inner tube sits on the outer tube, the clip expands with the help of the elastic force of the expansion spring and sticks to the inner wall of the clip chamber, so that the drilling tool can achieve positioning.
(3) Buffer structure by spring, locking mother, split pin composition. Protecting the inner tube when pulling the core.
(4) Single action structure is realized by two pairs of thrust bearings.
(5) Adjust the length of the inner pipe assembly and the outer pipe assembly of the structure, and fine-tune the lower shaft and the locking mother to achieve the gap required by the end of the spring seat and the step inside the drill bit.
(6) The fishing structure, also known as the fishing device, is mainly composed of fishing hook, hammer and safety rope. The fishing hook is used to hold the spearhead while fishing the inner pipe, and the weight is used to speed up the fishing device's descent to save fishing time. The safety rope is a thin rope. When the inner pipe is stuck for some reason and cannot be lifted, the safety rope can be forcefully lifted and then the drill can be lifted.
Other Parts,Spearhead Base,Compression Spin,Core Lifter
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