On July 28, 2009, the China Electric Power Research Institute ordered a set of 1000kV/5mA, 0.03% high stability UHV DC source from our company for the construction of the UHV DC test base. Suzhou Huadian purchased the second large-scale high-precision equipment after purchasing similar equipment, which was used to build the national DC UHV standard. It shows that Suzhou Huadian has been recognized by industry authorities in this field.