Brief analysis of the development of the hottest e

  • Detail

Brief analysis of the development of electrical engineering and its automation specialty

Electrical Engineering and its automation specialty is a new discipline in the field of electrical information, but because it is closely related to people's daily life and industrial production, it has developed very rapidly and is now relatively mature. It has become an important part of high-tech industry, widely used in industry, agriculture, national defense and other fields, and plays an increasingly important role in the national economy. The tentacles of electrical engineering and automation extend to all walks of life, ranging from the design of a switch to the research of aerospace aircraft. Capable of working in the fields of system operation, automatic control, power electronic technology, information processing, test technology, research and development, economic management and the application of electronic and computer technology related to electrical engineering, he is a wide caliber compound senior engineering and technical talent. There is a great demand for high-level talents in this field. It is estimated that with the entry of large foreign enterprises, there will be a big gap in this professional field, and there is likely to be a shortage of talents at that time. Control theory and power theory are the basis of electrical engineering and automation. Power electronics technology and computer technology are the main technical means. At the same time, it also includes the research fields of system analysis, system design, system development, system management and decision-making

I. new electrical technology and the development of motors and electrical appliances

in the second half of the 20th century, new electrical technology mainly developed in the direction of new principles, new theories, new materials and new technologies. For example, if the normal temperature superconducting material is successfully developed, the resistance loss of the superconducting motor winding will be reduced to zero, which not only solves the problem of armature winding heating and temperature rise, but also greatly improves the efficiency of the motor. More importantly, the critical magnetic field strength and critical current density of the superconducting wire are very high, which makes the air gap flux density of the superconducting motor bring errors to the experimental machine, and the current density of the winding can be several times or even dozens of times higher than that of the traditional conventional motor. This greatly improves the power density of the motor and reduces the weight, volume and material consumption of the motor

In the 21st century, mankind expects to enter a new period of sustainable development. On the basis of the development of the 20th century, electrical technology will further develop rapidly. In addition to profound changes in the development of traditional electric power, electrical machinery and electrical control, it will also play an important role in promoting the development of energy, transportation and other industries. For example, in terms of energy and electricity, we can generate electricity by nuclear energy, magnetic fluid, wind energy, etc; In terms of transportation, maglev trains and electric vehicles are being popularized, and MHD propulsion ships are also being studied

more importantly, the importance of motors is more prominent in machine production and power generation. The motor has also changed from a single motor to a professional motor with different functions. In the field of power generation, such as nuclear power generators, MHD generators, wind power generators, solar generators, tidal energy generators. In the field of motors, such as high-performance permanent magnet motors, AC asynchronous motors, single-phase asynchronous motors, shaded pole motors, hysteresis synchronous motors, etc

the development of motor not only greatly improves human productivity, but also greatly enriches human life. In our daily life, motors are everywhere. Our air conditioners, refrigerators, microwave ovens and computers all have motors more or less. It can be seen that the importance of motor in our life

Second, power system

power system is an electric energy production and consumption system composed of power generation, transformation, transmission, distribution and consumption. Its function is to convert the primary energy of nature into electric energy through power generation power plants (mainly including boilers, steam turbines, generators and auxiliary production systems of power plants), and then supply electric energy to each load center through transmission, transformation and distribution systems, and then convert it into different forms of energy such as power, heat and light through various equipment, so as to serve the regional economy and people's life. If the journey is within the standard range, most of the power supply points and load centers are located in different regions, and cannot be stored in large quantities. Therefore, their production, transmission, distribution and consumption are all completed at the same time. New materials are one of the seven strategic emerging industries in China's "1025" plan, and organically form a whole in the same region. Power production must always maintain a balance with consumption. Therefore, the centralized development and decentralized use of electric energy, as well as the continuous supply of electric energy and the random change of load, restrict the structure and operation of the power system. Accordingly, in order to realize its functions, the power system needs to set up corresponding information and control systems in all links and at different levels, so as to measure, adjust, control, protect, communicate and dispatch the production and transportation process of electric energy, and ensure that users can obtain safe, economic and high-quality electric energy

the establishment of a large-scale power system with reasonable structure is not only convenient for the centralized management, unified scheduling and distribution of electric energy production and consumption, reducing the total installed capacity, saving the investment in power facilities, but also conducive to the rational development and utilization of regional energy resources and meeting the growing power needs of the regional national economy to a greater extent. Power system construction is often an important part of national and regional economic development planning

the emergence of power system has made the electric energy which is efficient, pollution-free, easy to use and easy to control widely used, promoted the changes in various fields of social production, created the electric power era, and produced the second technological revolution. The scale and technical level of power system has become one of the symbols of a country's economic development level

III. high voltage and insulation technology

Application Technology Based on experimental research. It mainly studies the performance of various insulating media and different types of discharge phenomena under the action of high voltage, the insulation structure design of high-voltage equipment, the equipment and methods of high-voltage test and measurement, the impact of strong electric field, strong magnetic field or electromagnetic wave generated by overvoltage, high voltage or large current of power system on the environment and protective measures, as well as the application of high voltage and large current. High voltage technology has a significant impact on the development of electric power industry, electrical manufacturing industry and Modern Physics (such as x-ray devices, particle acceleration, China's plastic machinery enterprises have increased their exploration of emerging markets for extruders, high-power pulse generators, etc. in recent years). High voltage and insulation technology is characterized by strong experimental, theoretical and cross

Since the late 1960s, high voltage technology has been widely used in fields other than electrical engineering; At the same time, we also continue to adopt new technologies to develop ourselves. The former mainly refers to the application of high-voltage technology in particle accelerators, high-power pulse generators, controlled thermonuclear reaction research, lightning and electrostatic control and protection in aviation and aerospace fields, magnetic fluid power generation, laser technology, plasma cutting, underwater oil exploration with electric water hammer, impact processing molding, stone crushing in human body, electrostatic dust removal, electrostatic spraying, electrostatic copying, etc. The new technologies used in the field of high voltage include using computers to calculate the transient process of power system and the wave process of substation; Laser technology is used to measure large current under high voltage; High voltage transmission and measurement using optical fiber technology; Use information technology for data processing, etc. All these constitute an important aspect of the development of high voltage technology in recent years

high voltage transmission can not only transmit electricity, but also has obvious economy. Local power generation is more resource-saving than transportation power generation, which has created China's current power strategy of high-voltage transportation

IV. power electronics and electrical transmission

power electronics. Power electronic technology is an emerging technology, which is formed by the intersection of three disciplines: electricity, electronics and control theory. It has become an indispensable professional basic course for the major of modern electrical engineering and automation, and plays an important role in cultivating professional talents. Electronic technology includes information electronic technology and power electronic technology. Generally speaking, analog electronic technology and digital electronic technology belong to information electronic technology. Power electronic technology is an electronic technology applied in the field of power. Specifically, it is the technology of using power electronic devices to transform and control electric energy. Power electronics is a subject that studies weak current, which is closely related to automation, but it often deals with strong current, so it is called the bridge between weak current and strong current

power electronics technology has important applications in motor control, current control, rectification, automation and simulation. Therefore, power electronics has become an important interface between the information industry and traditional industries. The application of power electronic technology has penetrated into all aspects of industrial production and social activities

electric drive. Electrical transmission refers to the use of electric motors to convert electrical energy into mechanical energy to drive various types of production machinery, transportation vehicles and objects that need to be moved in life. Since human beings invented and mastered all kinds of machinery to help them work, they need to have the driving force to promote machinery. In addition to human power itself, animal power, water power and wind power were first used, and then steam engine, diesel engine and gasoline engine were invented. Electric motor was invented in the 19th century

the motor has high efficiency, economical operation, convenient transmission and distribution of electric energy, and easy control of electric energy. Therefore, electric drive has become the transmission mode of most machines and an important foundation for industrialization. One of the transmission modes is mechanical, such as rocker arm, and pressure, such as hydraulic transmission. The transmission mode by controlling the motor is electrical transmission. As big as a country and as small as a factory, its electric drive automation technology level directly reflects its modernization level

Copyright © 2011 JIN SHI