The Development Trend of High and Low Voltage Complete Electrical Equipment

High and low voltage complete electrical equipment refers to the combination of electrical equipment components including circuit breakers, isolating switches, load switches, fuses, voltage transformers, current transformers, lightning arresters, etc., which are reasonably configured and enclosed in a metal shell to form a unified electrical equipment unit with relatively complete functions. The complete set of electrical equipment includes box type substations (miniaturized box transformers), ring main units (fully insulated gas filled cabinets), gas insulated metal enclosed switchgear (GIS), metal enclosed switchgear (switchgear), and comprehensive control cabinets, all of which have been put into actual operation in the power industry.

Compared with traditional primary equipment, high and low voltage complete sets of electrical equipment have the advantages of high reliability, low failure rate, and stable operation. At the same time, complete sets of electrical equipment are compact, durable, and have a high safety factor, which can achieve modularization of electrical equipment. In the actual operation of electrical equipment, it is convenient for electrical equipment maintenance personnel to operate and maintain the equipment, so it is increasingly favored by people and has a rapid development momentum.

The current situation of complete sets of high and low voltage electrical equipment

At present, complete sets of high and low voltage electrical equipment have made certain progress and have been widely used in the power industry, playing an important role in ensuring safe and reliable power supply. In the context of rapid development of the national economy in our country, the electrical equipment industry has also made significant progress. Through the "introduction digestion absorption innovation" of advanced foreign technologies, the electrical equipment industry has developed rapidly, and market demand continues to increase.

The high and low voltage complete sets of electrical equipment that have been put into practical engineering applications have adopted a series of advanced technologies. In the field of high-voltage electrical appliances, SF6 technology, vacuum technology, and combination technology have been widely used in power circuit breakers, basically realizing that circuit breakers do not use oil as the arc extinguishing medium and achieve oil-free operation. At present, domestically produced electrical equipment with voltage levels of 500kV and below in China can meet the domestic development needs, and its technical parameters have approached or reached advanced levels abroad.

The low-voltage electrical equipment industry was the first to apply computer technology to the structure of products, and has already achieved intelligence and networking of products. Intelligent low-voltage circuit breakers, motor controllers, overload relays, and a series of switchgear and other electrical products have emerged. In addition, low-voltage electrical equipment has achieved remarkable results in reliability research, contactless switching, vacuum technology, current limiting technology, zero arcing, high performance and miniaturization, modularity, and other aspects.

Our country's high-voltage switches have developed into metal enclosed types (including armored, interval, and box type), while low-voltage equipment is mainly based on enclosed withdrawable units. Various high-voltage handcart types, ring main units, box transformers, low-voltage drawer cabinets, motor control centers, and other products have been widely used in practical engineering applications.

The Development Trend of High and Low Voltage Complete Electrical Equipment

The complete set of electrical equipment is small in size, occupies less space, and has high performance. At the same time, the reliability of equipment operation is also high, and the inspection cycle of equipment can be shortened. With the rapid growth of electricity consumption in modern life, the demand for reliability in electricity consumption is constantly increasing, and the application of high and low voltage complete sets of electrical equipment will become increasingly widespread.

At the same time, with the acceleration of smart grid construction, the future power system not only needs to achieve optimized control at the control layer, but also needs to achieve intelligence in electrical primary equipment to ensure high reliability power supply. To achieve intelligence in high and low voltage electrical equipment, advanced automatic control technology needs to be adopted to operate the electrical equipment.

The intelligent complete set of electrical equipment enables the protection, control, monitoring, measurement, and other functions of the entire transmission and distribution system to be centralized, realizing the automation of the distribution network and laying a certain foundation for the wide area detection and diagnosis system in the power system, ensuring the safe operation of the power system. The high voltage electrical profession not only needs to adapt to the trend of integrated development of various professions, infiltrate each other, and break down professional barriers, but also should infiltrate and integrate with electronic technology, computers, and secondary systems to better achieve the intelligence of electrical equipment.

At the same time, future high and low voltage complete electrical equipment should achieve informatization, with remote information reception and transmission, and real-time monitoring of the operation status of the complete electrical equipment in the centralized control center. Moreover, advanced technologies such as CAD, CAPP, CAM, CAE, MIS, etc. will be increasingly applied in the field of electrical equipment.

In addition, the reliability of high and low voltage electrical equipment will continue to improve. At present, complete sets of high and low voltage electrical equipment need to be equipped with UPS power supply. The reason is that there are still power quality problems such as power outages, lightning spikes, surges, frequency oscillations, voltage mutations, voltage fluctuations, frequency drift, voltage drops, pulse interference, etc. in the current power grid. Therefore, from the perspective of improving power quality, it is necessary to equip complete sets of high and low voltage electrical equipment with a UPS power supply. In addition, in order to achieve the informatization of high and low voltage complete electrical equipment, precise network equipment and communication equipment need to be used, and such equipment does not allow power interruption. Therefore, UPS power supply will have increasingly important significance in future high and low voltage complete electrical equipment.

At present, both domestically and internationally, the scientific theory of electrical equipment is not yet fully developed, and there are still many aspects that need improvement and enhancement, especially in the establishment of arc processes and their mathematical models, which still require further research. The heating, electric power, electrical contact, electromagnetic characteristics and other aspects of electrical products also need to be analyzed and studied in depth.

The complete set of high and low voltage electrical equipment has the advantages of stable operation and high reliability, and its application fields in the power industry are constantly expanding. In the future, complete sets of high and low voltage electrical equipment will continue to develop towards intelligence, informatization, and automation, and will play an increasingly important role in the power industry, playing a crucial role in ensuring the safe production and reliable supply of electricity.