Electronic appliances, a general term for electrical components or devices composed entirely or mainly of electronic devices and circuits. Such as proximity switches, transistor temperature relays, synchronous contactors, etc. In the areas of signal detection, fault monitoring, and protection, priority is given to electronic implementation, while the operation of making and breaking strong current is mostly completed by contact devices. Due to the development of self closing devices, many have been completed by devices such as thyristors and insulated gate bipolar transistors. The main courses of electrical training include: political theory courses, foreign language courses, engineering mathematics, electrical network theory, electromagnetic field theory, power electronics, power system reliability analysis methods, high-voltage insulation theory, motor and electrical design theory and methods, motor and electrical quality control and testing methods, power system and its automation, power system safety and monitoring devices, high-voltage insulation testing technology, and new developments in electrical theory research Fundamentals of Computer Application Technology, Computer Aided Circuit Analysis, Fundamentals of Modern Management, etc. Electric energy, as the main secondary energy source in modern times, has been widely used in production and daily life, playing an extremely important role in the modernization process of human society. The production and transmission of electric energy have formed the "power industry", and the scientific and technological content of its operation and management is rapidly increasing; At the same time, the production, transmission, use, and control equipment of electrical energy are also constantly developing or updating towards intelligence, complete sets, and high efficiency, gradually combining with electronic computers, microelectronics technology, and power electronics technology to form new types of electrical technology and equipment. Electrical engineering is playing an increasingly important role in the development and progress of the national economy and science and technology. The field of electrical engineering mainly includes engineering technology related to the safe, reliable, and economical operation of power systems throughout the entire process of electricity production, transmission, and use, as well as the design, manufacturing, operation, measurement, and control of various electrical equipment and systems. This engineering field is closely related to engineering fields such as electronics and communication engineering, computer technology, control engineering, materials engineering, mechanical engineering, instrumentation engineering, and power engineering