Tianan Group Co.was established in 1969, a national large enterprise engaged mainly in electrical industry. It is also a national key high-tech enterprise. Under the group, there is 1 R&D center, and 10 specialized subsidiary companies. Total employee amounts to more than 3000 and total asset is up to RMB1.8 billion. Tianan Group is the China famous leading enterprise of electric equipment manufacturer. Including: Transformer (dry and oil-immersed type) Switchgear, circuit breaker (SF6, vacuum