U Series Miniature Vacuum Interrupter Product Features

With the rapid development of vacuum switches, countries with a high level of scientific and technological development in countries all over the world, especially Japan and the United States, have been committed to the study of the miniaturization of vacuum interrupters and have made breakthroughs. In recent years, through the in-depth study of the vacuum arc electromagnetic control theory and the electric field strength distribution inside the arc-extinguishing chamber and electric vacuum materials, the design level and manufacturing process of the vacuum interrupter in the State-owned Qi’an Plant have been continuously improved and improved. Introduced a new generation of U-Series miniaturized products.
First, the product features 1. Adopt the self-developed new type of magnetic contact structure. This contact structure produces a stronger and more uniform longitudinal magnetic field in the contact gap during the arcing than the presently used universal magnetic contact structure. Under the action of a strong magnetic field, the arc is effectively controlled to burn in a larger area, which enlarges the effective use area of ​​the contact, improves the current density distribution of the contact surface, and makes the arc always maintain the diffusion type, thereby reducing the Arc voltage and arc energy greatly increase its breaking capacity.
2. Through the computer-aided design, the uniformity of the electric field strength distribution inside the arc-extinguishing chamber is improved, the structure of the arc-extinguishing chamber is optimized, the insulation level of the arc-extinguishing chamber is improved, and the miniaturization of the arc-extinguishing chamber is realized.
3. A new type of sealing and sealing process is adopted to complete the sealing and discharge of the arc extinguishing chamber from the components to the entire pipe, eliminating the secondary pollution of the components by people and the environment. The total vacuum degree and cleanliness in the arc extinguishing chamber are improved, and the breaking performance, insulation level and coaxial level of the arc extinguishing chamber are improved.
At the same time, the new process structure reduces the sealing weld of the arc extinguishing chamber, reducing the original 9 tracks to 6 tracks and greatly improving the sealing reliability. Extinguishing chamber leakage rate greatly reduced.
4. The adoption of a new type of anti-twist structure of the bellows not only prevents the bellows from being sprained, but also makes the appearance of the entire tube more beautiful, and also brings convenience to the installation.
Second, market advantages Vacuum switch technology after nearly 30 years of development, the market share increased year by year, more and more manufacturers, market competition is also very fierce. In particular, since the accession to the WTO, the domestic vacuum switch manufacturing industry has been threatened by wholly foreign-owned and joint ventures, making the competition increasingly fierce. Market demand for advanced miniaturized Zhaokong switch is more and more urgent; users need products with small size, small footprint, low cost, and superior performance.
In accordance with the market demand outlook, the state-owned company’s seven-seven-seventh plant has developed a series of 25kA breakers for use with 25kA, 25kA, 25kA, 31.5kA, 40kA, 80kA and 35kV, and 12kV breakers for load circuit breakers. The vacuum interrupter product, which is a new product developed by the company itself, has independent intellectual property rights.
The superior performance of the U-series vacuum interrupters and the miniaturized size combined with the application of composite insulation not only reduce the phase spacing between the vacuum circuit breakers, reduces the overall size, but also mainly meets the breaking capacity of the traps and the higher The level of insulation behind the arc. In addition, after using the miniaturized vacuum interrupter for the current product. It is also possible to remove additional insulating parts between phases, which can reduce costs and facilitate installation and commissioning.
The development of vacuum circuit breakers in China has been a development cycle since ZN3 was born almost every 10 years. The advent of the new generation of U series miniaturized vacuum interrupters will accelerate the upgrading of vacuum circuit breakers and further promote the development of vacuum circuit breakers. The rapid development of the vacuum switch industry in China. From the perspective of market demand and vacuum switch development, the new generation of U-Series miniaturized vacuum interrupter before the state-run seven seven seventy-seventh factory will have a wide range of pre-fashion stores, and will gradually replace the current products and dominate the market.