The electrical engineering and automation major is a new discipline in the field of electrical information. However, due to its close relationship with people's daily life and industrial production, the development is very rapid and it is now relatively mature. It has become an important component of the high-tech industry and is widely used in industries such as industry, agriculture, and national defense, and plays an increasingly important role in the national economy. The tentacles of electrical engineering and automation have extended to all walks of life, from the design of a switch to the research of aerospace aircraft. Can work in the fields of system operation, automatic control, power electronics, information processing, test technology, research and development, economic management, and electronic and computer technology applications related to electrical engineering. It is a wide-caliber "complex" advanced engineering and technical personnel. . There is a great demand for high-level talent in this field. It is estimated that with the entry of large foreign companies, there will be a large gap in this professional field, and it is very likely that the shortage of talent will occur. Control theory and power network theory are the foundation of electrical engineering and automation. Power electronics and computer technology are its main technical means. They also include system analysis, system design, system development, and system management and decision-making.

First, the development of new electrical technology and electrical and electronic appliances

In the second half of the 20th century, new developments in electrical engineering mainly focused on new principles, new theories, new materials, and new technologies. For example, if the normal temperature superconducting material is successfully developed, this will reduce the resistance loss of the superconducting machine winding to zero, which not only solves the problem of armature winding heating and temperature rise, but also greatly improves the motor efficiency. What is more important is that the critical magnetic field strength and critical current density of the superconducting wire are very high, so that the air gap flux density of the superconducting machine and the current density of the winding can be increased several times or even tens of times compared with the conventional conventional motor. This greatly increases the power density of the motor and reduces the weight, volume and material consumption of the motor.

In the 21st century, humankind hopes to enter a new period of sustainable development, and electrician technology will further develop rapidly on the basis of development in the 20th century. In addition to the profound changes in the development of traditional power, electrical appliances, and electrical control, it will also play an important role in promoting energy, transportation, and other industrial development. For example, in terms of energy and power, we can use nuclear power generation, magnetic fluid power generation, wind power generation, etc. In terms of transportation, maglev trains and electric vehicles are becoming popular, and magneto-hydrodynamic propellant ships are also being studied.

More importantly, the importance of motors is even more prominent in machine production and power generation. The motor also changed from a single motor in the past to a specialized motor with various functions. In the field of power generation, such as nuclear power generators, magnetic fluid generators, wind generators, solar generators, tidal power 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 motors has not only greatly improved human productivity, but also greatly enriched human life. In our daily life, motors are everywhere, our air conditioners, our refrigerators, our microwave ovens, and our computers have more or less the presence of motors. Visible Motor's Importance in Our Life

Second, the power system

The power system is a power production and consumption system composed of power generation, power transformation, transmission, distribution, and electricity use. Its function is to convert natural primary energy into electrical energy through power generating power plants (mainly including boilers, steam turbines, generators, and power plant auxiliary production systems, etc.), and then to supply electrical energy to each load through the transmission, transformation and distribution systems. The center converts various forms of energy such as power, heat and light through various devices to serve the regional economy and people's lives. Since most of the power points and load centers are in different regions and cannot be stored in large quantities, their production, transportation, distribution, and consumption are all completed within the same time, and organically formed in the same geographical area. Power production must be maintained and consumed at all times. balance. Therefore, the concentrated development and decentralized use of electrical energy, and the continuous supply of electrical energy and random changes in load, have constrained the structure and operation of the electrical power system. Therefore, to realize its functions, the power system must set up corresponding information and control systems at all links and levels in order to measure, regulate, control, protect, communicate and schedule the production and transportation of electrical energy. Get safe, economical, and high-quality electrical energy.

The establishment of a reasonably-structured large-scale power system not only facilitates centralized management, unified scheduling and distribution of electrical energy production and consumption, reduces total installed capacity, saves investment in power facilities, but also facilitates the rational development and utilization of regional energy resources, and meets regional nationals to a greater extent. The growing electricity needs of the economy. Power system construction is often an important part of national and regional national economic development planning.

The emergence of the power system has made the highly efficient, non-polluting, easy-to-use and easily regulated electric energy widely used. It has promoted changes in various fields of social production, created the era of electric power, and the second technological revolution has taken place. The scale and technical level of the power system have become one of the symbols of a country’s economic development level.

Third, high voltage and insulation technology

Applied 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 devices, the equipment and methods for high-voltage test and measurement, and the over-voltage, high-voltage, or large-current generation of power systems. Strong electric fields, strong magnetic fields or electromagnetic waves affect the environment and protective measures, as well as high voltage, high current applications. High-voltage technology has a major impact on the development of the power industry, electrical manufacturing industry, and modern physics (such as X-ray devices, particle accelerators, high-power pulse generators, etc.). The characteristics of high voltage and insulation technology are strong experimental, strong theoretical, and strong crossover.

Since the late 1960s, high-voltage technology has been widely used in fields other than electricians; at the same time, new technologies have been continuously adopted to develop itself. The former mainly refer to high-voltage technology in particle accelerators, high-power pulse generators, controlled thermonuclear reaction research, aerospace and aerospace lightning and static control and protection, magnetic fluid power generation, laser technology, plasma cutting, electric water hammer on the sea floor Oil exploration, impact processing molding, human body stone crushing, and electrostatic dust removal, electrostatic spraying, electrostatic copying and other applications. The new technologies used in the high-voltage field include the use of electronic computers to calculate the transient process of power systems and wave processes in substations; the use of laser technology for high-current measurements at high voltage; and the use of fiber optic technology for high-voltage transfer and measurement The use of information technology for data processing. All this constitutes 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 economical efficiency. Local power generation is more resource-saving than transportation power generation, which also creates our current high-voltage power transmission strategy.

Fourth, power electronics and electric drive

Power Electronics. Power electronics technology is an emerging technology. It is formed by the intersection of three disciplines: electrical science, electronics, and control theory. It has become an indispensable professional basic course for modern electrical engineering and automation, and it occupies the training of professionals. important position. Electronic technologies include the two major branches of information electronics and power electronics. The so-called analog electronic technology and digital electronic technology all belong to information and electronic technology. Power electronics technology is an electronic technology applied to the electric power field. Specifically, it is a technology that uses power electronics to convert and control electrical energy. Power electronics is the subject of research on weak currents. It is closely related to automation, but it often deals with strong electricity. Therefore, it is called a bridge connecting weak electricity and strong electricity.

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 electronics technology has penetrated into all aspects of industrial production 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 items that need to be exercised in life. Since mankind invented and mastered various kinds of machinery to help oneself labor, it needed the driving force to promote machinery. In addition to the manpower itself, the animal power, water power and wind power were used initially. Later, steam engines, diesel engines and gasoline engines were invented. They were invented in the 19th century. Motor.

The high efficiency of the motor, the more economical operation, the more convenient transmission and distribution of electrical energy, and the easy control of electrical energy. Now electrical transmission has become the transmission method for most of the machinery and has become an important basis for industrialization. One of the transmission methods is mechanical, such as a rocker, and there is pressure such as hydraulic transmission, and the way of driving by controlling the motor is electric transmission. As large as a country, as small as a factory, its level of electrical drive automation technology directly reflects its level of modernization.