Compared to the S11 with the same capacity transformer, the newer energy-saving type of transformer has a 25% or more reduction in no-load loss and a 70% or more reduction in no-load current.
It is mainly used in 10KV 11KV 13.8KV 15KV 20KV 22 KV 30KV 33KV 34.5 35KV power distribution systems of rural and urban power grids.