https://www.tiananelectrical.com/

Since founded in 1969 till now Ningbo Tianan (Group) Co. Ltd has become a famous leading enterprise of the power transmission equipment manufacturing in China. 
The company's main products include 220kV voltage class power transformers, outdoor high-voltage isolation switches, transformers; 12kV to 40.5kV voltage class box substation, prefabriced cabin, transformer, high-voltage switch set equipment and control equipment, 0.4kV to 0.69kV voltage level of low voltage complete set of switching equipment and control equipment.