Siemens AG and its high-voltage switchgear equipment and technologyAbstract: Siemens is the worlds production of high-voltage switchgear, one of the leading companies, with more than 30 years producing high-voltage circuit breakers and SF6 enclosed switchgear (GIS) in history, has scored brilliant achievements, marketing products around the world, the product 80 % export. Keywords: Siemens high voltage switchgear 1. Brilliant performance Siemens is the worlds production of high-voltage switchgear, one of the leading companies, with more than 30 years producing high-voltage circuit breakers and SF6 enclosed switchgear (GIS) in history, has scored brilliant achievements, marketing products around the world, 80% of products exported . In 1960 the company began to make SF6 technology, basic research work, in 1964 provide the first batch of 245KV SF6 circuit breakers; 1968 provide the first set of six intervals 145kVGIS, 1974 year provided the first interval of 245VGIS, 1978 year provided the first interval of 420 / 550kV GIS, 1984 year provided 550kVGIS, for the harsh network conditions: rated current 8000A, rated short-circuit breaking current of 100KA, total 17 units circuit breaker, from 1987 to 1991 to develop 7.2.5 550kV second generation of GIS, 1997, developed out of intelligent GIS, interval of integrated control, monitoring and diagnostics. Siemens AG, the worlds 750 provides more than 7,000 substations interval GIS. Dividing by product type, Siemens offers 8DN8 type 145kVGIS 4700 interval, 8DN9 type 245kVGIS 1800 interval, 8DQ1 type 550kV GIS 550 intervals, a total of more than 7,000 intervals. 8DN8 products which run the 64,000-year intervals, 8DN9 products run the 14,000-year intervals, 8DQ1 products run the 5800 interval, the interval of years, a total of 84000. In the high-voltage circuit breaker in the past 30 years, Siemens outdoor SF6 circuit breaker produced 20,000 units, 6,000 units of production GIS with circuit breaker, for a total of 26,000 units of production high voltage SF6 circuit breaker. The company produces 100 thousand dollars SF6 interrupter, actuator 52000 Taiwan. In the GIS, 8DN8 a total of cylinder-type structure for the three-phase, 8DN9 type and 8DQ1 type of phase separation structure. 8DN8 type of the original do 145kV pole is done 245kV level. Siemens high-voltage switchgear belonging to Siemens Power Transmission and Distribution Group (Power Transmission and Distribution, referred to as PTD). In the group, the production of GIS and the pipeline companies inflated the Berlin High Voltage Switchgear Factory (hereinafter referred to SWH), the production of high-voltage SF6 circuit breaker enterprises 5; Berlin High Voltage Switchgear Factory (SWH), the United States, fackson company, Brazils Sao Paulo Corporation, Chinas Hangzhou high-voltage switch companies and companies in India Aurangabad. High voltage switch factory in Berlin which is the largest production base. High Voltage Switch Factory in Berlin (Berlin Schaltwerk Hochspannung-SWH) belongs to the Ministry of Siemens AG, High Voltage Power Transmission and Distribution Group (PTD). Products include high-voltage circuit breakers and GIS (72.5kV 800kV, short-circuit breaking current of 100KA), high-voltage isolating switch, lightning arrester and so on. Product performance to achieve high reliability, minimal maintenance (maintenance interval of 20 years). 80% of products exported, the delivery time of 4 to 9 months, depending on type of product may be, with annual sales of 400 million DM (German marks, 1DM about 5 yuan). 1,000 employees, including 260 known scientists, engineers and technicians, 570 workers, 70% were technicians. Has a fixed capital 250 million DM, of which 140 million DM for the test equipment. Berlin High Voltage Switch Factory has the worlds largest privately held high-voltage test equipment. The amount of investment, the annual sales of 4% for new programs to replace equipment, with annual sales of 8% for research and development. Factory covers an area of 8,000 square meters. 2. High-voltage circuit breaker Siemens high-voltage SF6 circuit breaker has experienced double-pressure type - single-pressure type - type of thermal expansion.Dual-pressure type has already eliminated. Single-pressure type SF6 circuit breaker to do 550kV100KA and 800kV63KA level. The single-voltage circuit breaker has three features: 1. Interrupter to open the way using fixed-distance. Will open with a breaking away from the current big advantage; 2. Nozzle and arcing graphite ring. Graphite nozzle even if the short-circuit breaking current of 20 times, its surface has not scared, because the graphite sublimation directly from the solid-state gasification; 3. Kai-off two-way movement, breaking a short time, can be achieved when the two 60Hz cycle. As the development of SF6 circuit breaker, Siemens has developed a thermal expansion-type SF6 circuit breaker. 1996 was first exh