High and low voltage complete sets of electrical equipment refers to the combination of electrical equipment components including circuit breakers, isolating switches, load switches, fuses, voltage transformers, current transformers, lightning arresters and other electrical equipment components, which are reasonably configured, and the combination is enclosed in a metal shell. Form a unified electrical equipment as a whole, while having relatively complete functions. The complete set of electrical equipment includes: box-type substation (miniature box-type substation), ring network cabinet (full-insulated inflatable cabinet), gas-insulated metal-enclosed switchgear (GIS), metal-enclosed switchgear (switchgear), and integrated control cabinet, etc., At present, they 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, stable operation, etc. . At the same time, complete sets of electrical equipment are more compact, durable and have a high safety factor, which can realize the maintenance of electrical equipment. Modularity. 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 its development momentum is relatively rapid.
The status quo of high and low voltage complete sets of electrical equipment
At present, high and low voltage complete sets of electrical equipment have developed to a certain extent and have been widely used in the power industry. They play an important role in ensuring safe and reliable power supply. In the context of the rapid development of the national economy in my country, the electrical equipment industry has also improved significantly. Through the "introduction-digestion-absorption-innovation" of foreign advanced technology, the electrical equipment industry has developed rapidly, and market demand has also continued to increase. .
At present, the high and low voltage complete sets of electrical equipment that have actually been put into engineering application have adopted a series of advanced technologies. In terms of high-voltage electrical appliances, SF6 technology, vacuum technology, and combined technology have been widely used in power circuit breakers, basically realizing that the circuit breaker does not use oil as the arc extinguishing medium and realizes oil-free. At present, my country's domestic electrical equipment with voltage levels of 500kV and below can already meet domestic development needs, and its technical parameters have approached or reached the advanced level of foreign countries.
The low-voltage electrical equipment industry precedes the application of computer technology to the structure of products, and has realized the intelligence and networking of products, and has intelligent low-voltage circuit breakers, motor controllers, overload relays and a series of switch cabinets, etc. Electrical products come out. In addition, low-voltage electrical equipment has achieved gratifying results in reliability research, non-contact switching, vacuum technology, current limiting technology, zero flashover, high performance and miniaturization, combination, and modularization.
my country's high-voltage switches have developed to metal-enclosed type (including armored, compartment and box-type), and low-voltage equipment is mainly closed withdrawable units. Various products such as high-voltage handcart type, ring main unit, box change, low-voltage drawer cabinet, and motor control center have been put into practical engineering applications in large quantities.
The development trend of high and low voltage complete sets of 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 the equipment operation is also high, and the inspection cycle of the equipment can also be shortened. With the rapid growth of electricity consumption in modern life, the demand for reliability of electricity consumption is also 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 the construction of smart grids, the future power system will not only achieve optimal control at the control layer, but also achieve intelligence in the electrical primary equipment to ensure high-reliability power supply. To realize the intelligentization of high and low voltage complete sets of electrical equipment, it is necessary to adopt advanced automatic control technology to operate the electrical equipment.
Intelligent complete sets of electrical equipment centralize the protection, control, monitoring, and measurement of the entire power transmission and distribution system, realize the automation of the distribution network, and lay a certain foundation for the wide-area detection and diagnosis system in the power system to ensure Safe operation of the power system. The high-voltage electrical major must not only adapt to the trend of integration and development of various disciplines, penetrate each other and break professional barriers, but also penetrate and integrate with electronic technology, computers, and secondary systems to better realize the intelligentization of electrical equipment.
At the same time, the future high and low voltage complete sets of electrical equipment should be informatized, with remote information reception and transmission, and the operation status of complete sets of electrical equipment can be grasped in real time in the centralized control center. In addition, advanced technologies such as CAD, CAPP, CAM, CAE, and MIS will become more and more common in the field of electrical equipment.
In addition, the reliability of high and low voltage complete sets of electrical equipment will continue to be improved. At present, high and low voltage complete sets of electrical equipment need to be equipped with UPS power supply. The reason is that power quality problems such as power outages, lightning spikes, surges, frequency oscillations, voltage mutations, voltage fluctuations, frequency drifts, voltage drops, and pulse interference still exist in the current grid. Therefore, from the perspective of improving power quality, it is very necessary to equip high and low voltage complete sets of electrical equipment with a UPS power supply. In addition, in order to realize the informatization of high and low voltage complete sets of electrical equipment, it is necessary to adopt sophisticated network equipment and communication equipment, and this type of equipment does not allow power to be interrupted. Therefore, UPS power supply will have more advantages in the future high and low voltage complete sets of electrical equipment. Significance has become more and more important.
At present, whether it is domestic or foreign, the scientific theory of the entire electrical equipment is not yet perfect, and there are still many aspects that need to be improved and improved, especially the arc process and the establishment of mathematical models that require further research. The heat generation, electromotive force, electrical contact, and electromagnetic characteristics of electrical products also require in-depth analysis and research.
High and low voltage complete sets of electrical equipment have the advantages of stable operation and high reliability, and their application fields in the power industry are also expanding. In the future, high and low voltage complete sets of electrical equipment will continue to develop in the direction of intelligence, information and automation, and will play an increasingly important role in the power industry, and play an important role in ensuring the safe production and reliable supply of power.