Vacuum Circuit Breaker Grabs Pressure Switch Market

According to statistics, among the 40.5KV class circuit breakers in China, vacuum circuit breakers have accounted for 84.31%, while in the 12KV class, the vacuum series accounted for 99.39%. In 2009, a total of 464,190 sets of 12KV vacuum circuit breakers with a wide range of production were produced in China, an increase of 82,067 units compared to 382,123 units in 2008, with a growth rate of 21.48%, especially at the 12KV level, such as the 2004 vacuum series. It was 238,344 units, which was an increase of 225,846 units in 2009 compared to 2004, almost doubling in five years. There are a total of 148 manufacturers producing 12KV vacuum circuit breakers in China.

With the dramatic increase in the production of vacuum circuit breakers, the output of vacuum interrupters and manufacturers have increased accordingly. In 2009, the output of 12KV vacuum interrupters reached 1,337,637, and the number of manufacturers reached 13, while in 2004, the output of 12KV vacuum interrupters was 799395 only. During the five years from 2004 to 2009, the output of vacuum interrupters has grown tremendously.

In foreign countries, medium voltage vacuum circuit breakers also have an absolute advantage. For example, Japan accounts for more than 90%, Germany accounts for more than 95%, and India also accounts for more than 89%. ABB promoted vacuum and SF6 technology at the same time in the late 1990s, and then vigorously developed vacuum technology. Now it produces 350,000 vacuum interrupters every year, rated voltage is 40.5KV, and rated short-circuit breaking current is 63KA. In the area of ​​vacuum interrupters, the company has vigorously developed solid-sealed poles, and now has 1 million solid-packed poles in operation, producing 200,000 solid-packed poles each year. Solid-packed pole technology is continuously improving, from the development of epoxy resin auto-pressure gel technology to the latest thermoplastic + short glass fiber injection technology.

Medium voltage vacuum circuit breakers have now dominated the market. The main reasons for this are threefold: First, the power sector promotes vacuum switches. In 1992, the power department began to promote vacuum switches to users. After more than 10 years of hard work, manufacturers have accumulated rich operating experience. Vacuum switches are favored by users. Second, SF6 gas was designated by the Kyoto Protocol as six kinds in 1997. Restricted greenhouse gases, although the contribution of SF6 gas to the greenhouse effect accounts for only 0.1%, it is potentially dangerous and therefore objectively promotes the development of vacuum circuit breakers. Third, vacuum switches have been implemented in terms of performance and reliability. The great development can meet the different needs of various users, and the development of various special-purpose and multi-functional vacuum circuit breaker products provides users with a great choice of space. At present, the pole of a vacuum circuit breaker is changed from air insulation, composite insulation, and solid insulation. The arc extinguishing chamber is manufactured with a single sealing process, which not only improves the output but also improves the quality. Seen from the contact structure, the development from the transverse magnetic field to the longitudinal magnetic field greatly contributes to the improvement of the breaking performance. Vacuum circuit breaker also has a great change in function, from the single starting function to the breaking - isolation - grounding and other functions.

Based on the above reasons, vacuum circuit breakers have developed strongly in China's medium voltage field, have large output, and have many manufacturers. They are very popular among users.