HOW IS ELECTRICITY TRANSMITTED?

After the electricity is output from the power plant, only after transmission can it get to the user's house, so how can the transmission of electric power be carried out? The following is an introduction to the transmission process of electric power.
Transmission of Electricity
The transmission, distribution and use of electricity together constitute the overall function of the electric power system. Through transmission, electric power plants with far distances (up to thousands of kilometers) are linked to load centers to make the development and utilization of electricity beyond the limits of the region. Compared with the transmission of other energy sources (such as coal transportation, oil transportation, etc.), the electricity transmission loss is small, the benefit is high and it is flexible and convenient. It is easy to regulate and control, and the environmental pollution is less. Electricity transmission can also connect electric power plants in different locations and carry out peak and valley regulation. Electricity transmission is an important embodiment of the superiority of electric power utilization, and it is an important energy artery in modern society.

Transmission lines can be divided into overhead transmission lines and underground transmission lines according to the structure. The former consists of line towers, conductors, insulators, etc., which are mounted on the ground, while the latter is mainly cable and is laid underground (or underwater). Transmission can be divided into DC transmission and AC transmission according to the characteristics of the transmitted current. DC transmission was first successfully realized in the 1880s, and then replaced by AC transmission at the end of the 19th century because of the limitation that the voltage could not be increased. The success of AC transmission ushered in the era of electrification in the 20th century. Since the 1960s, due to the development of power electronics technology, DC transmission has a new development. With AC transmission, AC / DC hybrid electric power system has been formed.

The level of transmission voltage is the main symbol of the development level of transmission technology. By the 1990s, high voltage transmission of 330 kV-765 kV and UHV transmission of more than 1000 kV were commonly used in the world.
With the increasing popularity of mobile devices, wireless data transmission and wireless network technology, people hope to get rid of the shackles of traditional power transmission methods and relieve the problems caused by chaotic power lines. Therefore, wireless power transmission technology has become the most worthy technology in the 21st century, and wireless charging products have become a new focus point for people to pay attention to. At present, many countries all over the world are studying and developing wireless power transmission technology, exploring the application of wireless power transmission system in different fields, and making it practical.

Wireless power transmission (WPT), also known as wire-free energy transmission or wireless electric power transmission, is realized by electromagnetic induction and energy conversion. Wireless power transmission mainly realizes contactless power transmission through electromagnetic induction, electromagnetic vibration, radio frequency, microwave, laser and so on.

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