220kV transmission line design considerations

1. Tower design of 220kV transmission line

The tower is an important foundation for supporting 220kV transmission lines, supporting the conductors and ground lines of 220kV transmission lines, and also ensuring that 220kV transmission lines meet the requirements of insulation and electromagnetic field constraints. Different types of poles of 220kV transmission lines have great differences in operational safety, floor space, construction period, construction cost, transportation cost and time, and the towers account for a large proportion of the entire 220kV transmission line construction. Therefore, when designing a 220kV transmission line tower, it is necessary not only to strengthen the foundation construction management of the tower, but also to combine the geological conditions and climatic conditions of the construction site of the 220kV transmission line. According to the relevant regulations of the power system, the preliminary design of the tower is completed, and the total cost of the tower design is roughly calculated. If there is no relevant regulation to use the new tower, the 220kV transmission line can use the mature tower; if the 220kV transmission line in a certain area must use the new tower, the tower test should be done first, and then the quality of the tower should be put into use.

2. Conductor design of 220kV transmission line

The wire is an important part of the 220kV transmission line, which has the function of conducting current and transmitting electrical energy. Usually, the wires are exposed on the poles of the transmission line. During long-term operation, the wires need to bear the changes of their own weight, rain and snow climate and sunshine. Therefore, when selecting the transmission line wires, it is important to consider the wires. Mechanical strength and electrical performance, according to the actual environment around the 220kV transmission line, choose a reasonable wire. At present, in China's 220kV transmission line, steel-cored aluminum stranded wire is the most widely used. The outer part of the steel-cored aluminum stranded wire is made of aluminum wire, and the inside is steel wire. This wire has good mechanical strength and can be Transfer large currents. The 220kV transmission line has a high voltage level and a large amount of electric energy transmission. In order to influence corona and high-frequency communication, 220kV transmission lines usually need to use two or more wires. In addition, there should be no corrosion spots or inclusions on the surface of the 220kV transmission line. It is necessary to ensure the smoothness and roundness of the surface of the conductor, and the stranding of the conductor must be tight and uniform. The stranding density of the conductor should meet the discharge standard of the transmission line.

3. Path design of 220kV transmission line

The path design of 220kV transmission line should fully consider the feasibility, economy, technicality and safety and stability of the transmission line. The rationality of the path design has a very important impact on the circuit design of the entire 220kV transmission line. The key to the design of 220kV transmission line. The path design of the 220kV transmission line mainly includes the on-line selection of the transmission line and the on-site selection. On-site line selection of 220kV transmission lines must be carried out on-the-spot investigation. In the convenience of transportation, it is convenient to repair and construct the transmission lines, and avoid the on-site selection of 220kV transmission lines to occupy fertile land or through forests and orchards. For the selection of the 220kV transmission line, the traffic, hydrology, geology, communication, meteorology and forestry materials on the construction site should be carefully collected. The starting point, key points and necessary points of the transmission line should be accurately marked on the transmission line map. The shortest route design principle, choose the right design.

4. Lightning protection design of 220kV transmission line

The lightning protection design of 220kV transmission line is an important measure to ensure the safe and stable operation of the power system. In order to ensure the lightning protection effect of the 220kV transmission line, different lightning protection structures should be designed for different line structures of the power system. The lightning protection design of the 220kV transmission line is installed on the line to ensure the safety of the transmission line. First, the grounding protection, according to the structural characteristics of the 220kV transmission line, the grounding protection is the most common lightning protection design method. By grounding the transmission line, the high current and strong voltage applied to the 220kV transmission line are introduced into the underground, and the 220kV transmission line is prevented. The lightning design should correctly select the location of the lightning protection equipment so that different lightning protection equipments can cooperate with each other. Second, equipment protection, strengthening the management of lightning arresters, computers and other equipment, using comprehensive protection measures, timely protection of comprehensive monitoring of its operating status, timely replacement of damaged equipment. Third, shield protection, focus on shielding the interference information of the transmission line, do the signal line shielding design, combine the shielded cable and the power line to ensure the stability and effectiveness of the transmission line connection.

5, 220kV transmission line design considerations

1) Line corridor width design.

When planning and designing a 220kV transmission line, you can choose the cat head tower or the dry word tower, and design a single circuit for the transmission line to reduce the floor space and width of the 220kV transmission line corridor.

2) Control the influence of electromagnetic radiation on the transmission line.

The influence of electromagnetic radiation on 220kV transmission lines mainly includes interference with radio and electric field effects. In order to better control the influence of electromagnetic radiation on 220kV transmission lines, strengthen the voltage and current control of transmission lines, strictly control 220kV transmission line towers and electrical insulation. The cooperation between the equipments, the distance between the ground and the tower is reasonably set, and effective measures are taken to detect the running state of the transmission line to avoid safety accidents and affect people's lives.

3) Environmental impact assessment.

The circuit design of 220kV transmission line should pay attention to the geological disaster assessment, hydrogeological impact assessment, flood control impact assessment, cultural relic protection evaluation and seismic safety evaluation of the transmission line to the surrounding environment. In the construction process of 220kV transmission line, we should try our best to avoid it. The construction of geological collapse, gully, landslide, steep slope, fault zone and other sections, using safe and reliable treatment measures to ensure the smooth construction of 220kV transmission line.

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