China's power equipment and power production industry has developed rapidly. The annual growth rate of newly-added power generation capacity exceeds 8%, and it is expected that the installed capacity will reach 800 million kW by 2020. However, according to per capita possession of electricity, our country lags far behind developed countries. Due to the large space for development of related industries, there is a huge market demand for high-voltage and low-voltage complete sets of equipment.
The huge market demand has also brought fierce competition from domestic and foreign manufacturers. Only domestic manufacturers of high- and low-voltage complete sets of equipment have reached 1,000. The market demand has promoted the progress and development of technology. With the progress of society and the development of economy and science and technology, higher and newer requirements have been put forward for the power system. In particular, higher requirements are placed on the safety, reliability, automation, and other aspects of the main equipment that controls the power system—high and low voltage equipment. In this way, it is an urgent task to develop a new type of high- and low-voltage equipment products that meet the needs of the market.
Since the reform and opening up, China's electrical appliance industry has entered a new era of great development through the introduction of "digestion-innovation" and advanced management experience and technology from developed countries in the rapid development of the national economy. High-low voltage electrical technology has made great progress in product design, manufacturing process, and operation management.
In the area of ​​high-voltage electrical appliances, SF6 technology, vacuum technology, and combination technology have been applied to the product structure, and basically achieved "oil-free". Processes have introduced the introduction of shell production lines, vacuum epoxy casting and injection molding equipment, machining centers, welding robots, cabinets with CNC and plastic coating equipment processing. At present, domestic equipment with a voltage rating of 500kV and below has been able to meet domestic needs, and its technical parameters have approached or reached foreign advanced levels.
The low-voltage electrical appliance industry will first apply the computer technology and product structure to the high-pressure industry. Intelligent and networked products have been implemented, and intelligent low-voltage circuit breakers, motor controllers, overload relays, switch cabinets and other products have been available; in addition, domestic low-voltage electrical appliances in reliability studies, non-contact switches, vacuum technology, current limiting Technology, zero arcing, high performance and miniaturization, composition, modularization, and modularization have all achieved encouraging results.
China's high-voltage switchgear has been developed into a metal-enclosed type (including armouring, spacing, and box type), and low-pressure is mainly based on closed draw-out units. Various types of high-pressure trolleys, mid-mounted, RMUs, FC cabinets, cabinets, and low-voltage chests of drawers, motor control centers and other products have been marketed in large quantities.
China's high and low voltage complete sets of equipment have all been equivalent or equivalent to IEC standards, and are also stricter than IEC standards in terms of their national conditions.
Many companies in the electrical industry in China have adopted advanced technologies such as CAD, CAPP, CAM, CAE, and MIS. Some key and key enterprises already have CIMS technology. It is worth mentioning that, until the end of the 20th century, the whole electrical science theory has not yet reached a stage of maturity and perfection, whether it is domestic or foreign, especially for the establishment of the arc process and its mathematical model, etc., remains to be further studied. The design of electrical products has some sporadic empirical formulas in addition to heat, electrical power, electrical contact, electromagnetic properties, etc., but in the final analysis, it is an analogy optimization and experiment method.
The huge market demand has also brought fierce competition from domestic and foreign manufacturers. Only domestic manufacturers of high- and low-voltage complete sets of equipment have reached 1,000. The market demand has promoted the progress and development of technology. With the progress of society and the development of economy and science and technology, higher and newer requirements have been put forward for the power system. In particular, higher requirements are placed on the safety, reliability, automation, and other aspects of the main equipment that controls the power system—high and low voltage equipment. In this way, it is an urgent task to develop a new type of high- and low-voltage equipment products that meet the needs of the market.
Since the reform and opening up, China's electrical appliance industry has entered a new era of great development through the introduction of "digestion-innovation" and advanced management experience and technology from developed countries in the rapid development of the national economy. High-low voltage electrical technology has made great progress in product design, manufacturing process, and operation management.
In the area of ​​high-voltage electrical appliances, SF6 technology, vacuum technology, and combination technology have been applied to the product structure, and basically achieved "oil-free". Processes have introduced the introduction of shell production lines, vacuum epoxy casting and injection molding equipment, machining centers, welding robots, cabinets with CNC and plastic coating equipment processing. At present, domestic equipment with a voltage rating of 500kV and below has been able to meet domestic needs, and its technical parameters have approached or reached foreign advanced levels.
The low-voltage electrical appliance industry will first apply the computer technology and product structure to the high-pressure industry. Intelligent and networked products have been implemented, and intelligent low-voltage circuit breakers, motor controllers, overload relays, switch cabinets and other products have been available; in addition, domestic low-voltage electrical appliances in reliability studies, non-contact switches, vacuum technology, current limiting Technology, zero arcing, high performance and miniaturization, composition, modularization, and modularization have all achieved encouraging results.
China's high-voltage switchgear has been developed into a metal-enclosed type (including armouring, spacing, and box type), and low-pressure is mainly based on closed draw-out units. Various types of high-pressure trolleys, mid-mounted, RMUs, FC cabinets, cabinets, and low-voltage chests of drawers, motor control centers and other products have been marketed in large quantities.
China's high and low voltage complete sets of equipment have all been equivalent or equivalent to IEC standards, and are also stricter than IEC standards in terms of their national conditions.
Many companies in the electrical industry in China have adopted advanced technologies such as CAD, CAPP, CAM, CAE, and MIS. Some key and key enterprises already have CIMS technology. It is worth mentioning that, until the end of the 20th century, the whole electrical science theory has not yet reached a stage of maturity and perfection, whether it is domestic or foreign, especially for the establishment of the arc process and its mathematical model, etc., remains to be further studied. The design of electrical products has some sporadic empirical formulas in addition to heat, electrical power, electrical contact, electromagnetic properties, etc., but in the final analysis, it is an analogy optimization and experiment method.
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