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Progress of high voltage vacuum circuit breaker Technology
Release time:2015-06-05 00:32 Read:Time

 

Outdoor high-voltage vacuum circuit breaker in the field of medium voltage 12-40.5kV has accounted for absolute advantage, and in the field of high voltage (72.5-252kV) has temporarily outcrop angle, its development prospects. In China, the medium voltage vacuum circuit breaker in 2009 has accounted for 99.39% of the medium voltage switch. High voltage vacuum circuit breaker in 72.5~126kV level continuously developed new products, and has been put into operation. In foreign countries, many countries and companies in the research and development of high pressure vacuum circuit breaker and some products have been put into operation for many years, such as Japan, South Korea, the United States, Germany, Russia and other. According to statistics, the Japanese transmission system has been using 72-252kV vacuum circuit breaker 3350. At present, the high-voltage vacuum circuit breaker has reached the 145kV single fracture, 168kV double fracture, is now being developed to higher voltage grade products. Products have tank and porcelain pole in the structure, China has made porcelain column of 126kV vacuum circuit breaker, and Japan 168kV of vacuum circuit breaker with tank type structure. In the vacuum out of the arc outdoor insulation, the use of low pressure SF6 gas such as (inner filling pressure 0.12MPa) insulation, and also useful dry air and other insulation as the insulation.

It is worth mentioning is the latest development of high voltage switchgear in China, there are two mainstream manufacturers a porcelain column type vacuum circuit breaker, such as the 2010 Western Electric Company successfully completed the project of the State Ministry of science and technology of 126kV vacuum circuit breaker, and through the national Ministry of science and technology acceptance. The product of the arcing chamber adopts longitudinal magnetic field coil structure, with high breaking capacity and good anti welding of copper chromium contact materials. The developed vacuum arc extinguishing chamber is the first product with complete intellectual property, and its technical level is advanced in the world.. Another is the high level group, Ping Gao group in the vigorous development of high voltage and large capacity of SF6 circuit breaker, seize the opportunity to developed high voltage vacuum circuit breaker. The group in November 2011 at the same time the LW55-72.5 tank SF6 circuit breaker, ZW55-63 type high voltage vacuum circuit breaker, ZW55-2 x 31.5 type and ZW55-31.5 vacuum circuit breaker is 4 kinds of new products of national identification, overall reached the international advanced level.

The Hannover exposition in 2011, Siemens exhibited 72.5kV vacuum circuit breaker insulating nitrogen (N2) to replace the traditional SF6 circuit breaker, indicating that Siemens began to pay attention to the research and development of outdoor high voltage vacuum circuit breaker. In the high voltage level, the development of vacuum circuit breaker is the need of the development of the situation, can greatly reduce the use of SF6 greenhouse gases, is conducive to environmental protection, reducing the greenhouse effect in the atmosphere. At the same time, the high voltage vacuum circuit breaker has the good low temperature characteristic, can avoid the cold area SF6 gas liquefaction problem, it is the high cold area high voltage grade circuit breaker best choice. In the research and development of high pressure vacuum circuit breaker need to solve a series of technical problems: vacuum insulated high voltage, high current vacuum interrupter, rated current and temperature, mechanical properties, vacuum destroy arc outdoor insulation and capacitive current breaking, small inductive current breaking etc.. The solution of these technical problems promotes the progress of vacuum circuit breaker technology. However, the development of outdoor high voltage vacuum circuit breaker is in the ascendant, and it is necessary to carry out research work..
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