At present, with the social and economic development, introduces a number of nonlinear loads in the power grid, but also brings to the power grid voltage fluctuations, grid side low power factor, voltage unbalance, harmonic content, such as a range of power quality problems. Therefore, both at home and abroad have implemented static var generator (Static Var Generator) power quality problems of governance. And SVG type supporting dedicated connection transformer as SVG system important part, its has impedance big, improve has transformer of anti-short-circuit capacity, and transformer used has new of process processing method, let its has unique of harmonic characteristics: II times winding current total harmonic distortion rate not is greater than 10%, which 2 times not is greater than 4%, 3 times and 4 times not is greater than 2%, other the times not is greater than 1 %.