Design of high voltage transmission lines for power engineering

Xingfuyuan Electricity Knowledge: The electricity generated by the power plant is not only used by people nearby, but also transmitted to faraway places to meet more needs. This electricity cannot be directly transmitted through ordinary wires, but must be transmitted using high-voltage transmission lines. Generally, the transmission voltage below 220 kV is called high-voltage transmission, the transmission voltage between 330 and 765 kV is called ultra-high-voltage transmission, and the transmission voltage above 1000 kV is called ultra-high-voltage transmission. When the electricity is transmitted to the place where it is used, the voltage must be lowered before it can be used.

Xingfuyuan mainly focuses on the actual design standards of high-voltage transmission lines in power engineering projects, rationally analyzes the ideas of line design, clarifies the mid-term construction process and the standards of later maintenance plans, attempts effective high-voltage transmission design and construction quality management, and promotes the rapid improvement of the level of power transmission measures.

1. Is the design of high-voltage transmission line reasonable?

The design of transmission lines during the survey process is a key task. Whether the design is reasonable is directly related to the normal and effective operation standards of the power system and the functional level of power transmission. It is necessary to accurately strengthen the design management effect of transmission lines according to the actual situation. Before designing, reasonable surveys should be carried out to understand the actual situation, clarify geological standards, surrounding environment, above-ground and underground buildings, etc., to effectively improve the design rationality of power grid transmission and distribution lines and ensure the normal survey work of transmission and distribution design. According to the actual standard design situation, the surveying and mapping standards should be analyzed, the key points of line measurement should be clarified, and detailed measurement and analysis of each angle, each frame process, distance and height should be carried out to determine the accuracy of the measurement and clarify the rationality of the actual measurement data. According to the actual surveying and mapping process, strict process standardization analysis should be carried out on surveying and mapping personnel to determine the regional division standards of transmission lines, accurately analyze the design path of transmission lines, determine the optimization of the design scheme, and determine the location of design survey in a reasonable form to ensure the normal progress of transmission line construction.

2 Analysis of overall elements of transmission line design

2.1 Design process of high voltage transmission lightning protection

Install effective lightning rods, formulate reasonable lightning current diversion methods, and ensure that the transmission lines do not contact the lightning strike point through safe introduction methods. Prepare lightning protection for lightning currents according to effective methods for protecting equipment or buildings. Use lightning conductors, distribute the conductors according to effective horizontal suspension methods, and clarify the composition standards of actual lightning diversion conductors and grounding devices. According to the matching method of high-voltage transmission equipment, set up as many effective transmission line equipment as possible to prevent surrounding buildings from being affected by lightning.

2.2 Establish effective conductor selection design criteria

According to the actual location of the high-voltage transmission line, accurately analyze the impact of the transmission line, judge the influencing factors of rainfall, hail, storms and other issues, clarify the possible impact factors of the outside temperature on its surroundings, clarify the actual process of industrial chemical gas emissions, and determine the actual impact standards of the transmission line. Through reasonable design, clarify the actual considerations of the high-voltage transmission line, and effectively analyze the material and basic structure selection of the line.

2.3 Actual path allocation standards for high-voltage transmission and distribution lines

The scientific and effective high-voltage transmission and distribution lines are set up to clearly and effectively reduce the construction standards and costs of high-voltage transmission lines, and ensure the effective and normal operation of transmission lines. By analyzing the standard structure of the actual transmission line, accurate preliminary survey and analysis are carried out to determine the geological conditions and surrounding environment. Formulate effective routes, allocate effective comprehensive evaluation standards, determine auxiliary angles and terrain construction standards, clarify effective construction plans, and start project development and construction of houses as soon as possible, so as to effectively reduce project costs and ensure the economy, safety, construction convenience and reliability of the overall route.

2.4 Clearly define the location of the tower construction design

During the design of pole tower construction, it is necessary to ensure the construction period of the pole tower and the time range of line transportation according to the actual composition and parts of the high-voltage transmission line, and ensure the feasibility of actual effective transportation. The quality of the pole tower foundation design and construction is directly related to the overall construction quality level of the high-voltage transmission line. According to the effective pole tower design standards, the inspection method of the design site standards is clarified, the content of various historical materials is fully mastered, the geographical environment and geological conditions are analyzed in all aspects, and effective measures are formulated according to the actual situation to reduce the occurrence and development of various accidents in the construction of pole towers and ensure the quality level of pole tower technical design and construction management.

2.5 Standards for anti-fouling in the design of high-voltage transmission and distribution

In the anti-fouling design of high-voltage transmission lines, it is necessary to conduct reasonable analysis based on the actual lossless type and target voltage insulation conditions, fully understand the configuration methods and standards of high-voltage transmission lines, and gradually reduce the impact of lossless on high-voltage lines. According to effective selection methods, determine the insulation distance, structural standards, etc. of high-voltage transmission lines, fully configure the pollution conditions of high-voltage transmission lines, determine the types and laws, and take effective protective measures. Deal with problems that cannot be achieved without loss, use effective physical measurement methods, improve chemical analysis results, and ensure the rationality of pollution treatment effects.