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Analysis of the Development Trend of High and Low Voltage Complete Electrical Equipment

Since the reform and opening up, China's electrical appliance industry has developed rapidly in the context of rapid economic growth. The annual increase in installed power generation capacity has exceeded 8%, and it is expected to reach 800 million kW by 2020.

　　However, in terms of per capita electricity consumption, China lags far behind developed countries. Due to the large development space of related industries, there is a huge market demand for high and low voltage complete sets of electrical equipment.

　　The huge market demand has also led to fierce competition among domestic and foreign manufacturers. There are already thousands of domestic manufacturers of high and low voltage complete sets of electrical equipment.

　　Market demand has promoted technological progress and development. With the progress of society and the development of economy and technology, higher and newer requirements have been put forward for the power system.

　　In particular, higher requirements have been put forward for the safety, reliability, and automation of the main equipment controlling the power system—high and low voltage complete sets of electrical equipment.

　　High and low voltage electrical appliance technology has made great progress in product design, manufacturing processes, management, and production processes.

　　In the field of high-voltage electrical appliances, SF6 technology, vacuum technology, and combination technology have been applied to product structures, and "oil-free" has been basically achieved.

　　In the process, shell production lines, vacuum epoxy casting and injection molding equipment, machining centers, welding robots, and CNC and plastic coating equipment for cabinet processing have emerged.

　　Currently, domestic equipment with voltages of 500 kV and below can meet domestic needs, and its technical parameters have approached or reached the advanced international level.

　　The low-voltage electrical appliance industry applied computer technology to product structures earlier than the high-voltage industry. It has realized the intelligence and networking of products, and intelligent low-voltage circuit breakers, motor controllers, overload relays, switch cabinets, and other products have been launched.

　　In addition, domestic low-voltage electrical appliances have made gratifying achievements in reliability research, contactless switches, vacuum technology, current limiting technology, zero arc, high performance and miniaturization, combination, analog-digital conversion, modularization, etc.

　　China's high-voltage switchgear has developed into metal-enclosed types (including armored, insulated, and box-type), while low-voltage switchgear is mainly enclosed and withdrawable units. Various high-voltage trolley-type, center-type, ring-network cabinets, F-C cabinets, box substations, and low-voltage drawer cabinets, motor control centers, and other products have been launched in large quantities.

　　Many enterprises in China's electrical appliance industry have begun to adopt advanced technologies such as CAD, CAPP, CAM, CAE, and MIS. Some key and backbone enterprises have already possessed CIMS technology.

　　It is worth mentioning that, until the end of the 20th century, neither domestically nor internationally had the entire electrical appliance science theory reached maturity and perfection. In particular, the establishment of topics such as the arc process and its mathematical model still needs further research.

　　The design of electrical products, apart from some sporadic empirical formulas in terms of heat generation, electrodynamics, electrical contact, and electromagnetic characteristics, is essentially a method of analogy optimization plus experimentation.

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Analysis of the Development Trend of High and Low Voltage Complete Electrical Equipment

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