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ABB Group is one of the top 500 enterprises in the world, with its headquarters in Zurich, Switzerland. ABB was formed in 1988 by the merger of two international enterprises with a history of more than 100 years, Sweden's ASEA and Switzerland's BBC Brown Boveri. The two companies were established in 1883 and 1891 respectively. ABB is a leader in power and automation technology. ABB's technology can help power, utilities and industrial customers improve their performance while reducing adverse environmental impacts. ABB Group has business in more than 100 countries around the world, with 130000 employees, and its sales reached 32 billion dollars in 2010. ABB has invented and manufactured many products and technologies, including a set of three-phase transmission systems, self cooled transformers, high-voltage DC transmission technology and electric industrial robots, and has taken the lead in putting them into commercial applications. ABB has a wide range of product lines, including a full range of power transformers and distribution transformers, high, medium and low voltage switchgear products, AC and DC transmission and distribution systems, power automation systems, various measuring equipment and sensors, real-time control and optimization systems, robot hardware and software and simulation systems, efficient and energy-saving motor and transmission systems, power quality, conversion and synchronization systems, Fusing and switchgear to protect power system safety. These products have been widely used in industry, commerce, power and public utilities.