The huge market demand has also brought fierce competition from domestic and foreign manufacturers. There are thousands of domestic high and low voltage complete sets of electrical equipment manufacturers alone. Market demand has promoted the progress and development of technology. With the progress of society and the development of economy and technology, higher and newer requirements have been put forward to the power system. In particular, higher requirements are put forward for the safety, reliability and automation of the main equipment for controlling the power system - high and low voltage complete sets of electrical equipment.
Since the reform and opening up, my country's electrical appliance industry has entered a new period of historical development by "introducing-digesting-innovating" advanced management experience and technology from foreign developed countries in the context of rapid development of the national economy.
my country's power equipment and power production industries are developing rapidly. The annual growth rate of newly installed power generation capacity exceeds 8%, and the installed capacity is expected to reach 800 million kW by 2020. However, in terms of the share of electricity per capita, my country is far behind developed countries. Due to the huge development space of related industries, there is a huge market demand for high-voltage and low-voltage complete sets of electrical equipment.
High and low voltage electrical technology has made great progress in product design, manufacturing process, business management and production process.
In terms of high-voltage electrical appliances, SF6 technology, vacuum technology, combination technology, etc. have been applied to the product structure, and "oil-free" has been basically realized. In the process, the introduction of shell production line, vacuum epoxy pouring and injection molding equipment, machining center, welding robot, CNC and plastic coating equipment for cabinet processing has appeared. At present, domestic equipment with voltage levels of 500kV and below can meet domestic needs, and its technical parameters have approached or reached foreign advanced levels.
The low-voltage electrical appliance industry applied computer technology and product structure before the high-voltage industry. Realize product intelligence and networking, and have already launched intelligent low-voltage circuit breakers, motor controllers, overload relays, switch cabinets and other products. In addition, domestic low-voltage electrical appliances have made gratifying achievements in reliability research, non-contact switches, vacuum technology, current limiting technology, zero flashover, high performance and miniaturization, combination, modularization, and modularization.
my country's high-voltage switchgear has developed to metal-enclosed type (including armored, spaced and box-type), and low-voltage switchgear is dominated by closed draw-out units. Various high-voltage handcart-type, mid-mounted, ring network cabinets, F-C cabinets, box-type transformers, low-voltage drawer cabinets, motor control centers and other products have been launched in large quantities.
Many enterprises in my country's electrical appliance industry have begun to adopt advanced technologies such as CAD, CAPP, CAM, CAE, and MIS, and some key enterprises have CIMS technology. It is worth mentioning that until the end of the 20th century, both domestic and foreign, the entire electrical science theory has not yet reached the stage of maturity and perfection, especially the establishment of the arc process and its mathematical model, which still needs to be further studied.
In addition to some sporadic experience in the design of electrical products in terms of heat generation, electric power, electric contact, and electromagnetic characteristics, in the final analysis, it is just a method of analogy optimization and experimentation.