Established in 1988, Sihu, which is located in the mid-west of Guangdong Province, is an official manufacturer of current transformer and voltage transformer. The products it manufactures include 0.72-1000kV current transformers, voltage transformers, combined transformers as well as insulation articles, 0.72-40.5kV dry-type power transformers, reactors, many kinds of trucks for switchgear, metering devices and so on.