The utility model relates to a technical field of transformer substation, concretely relates to electric system. An electric system of transformer substation, includes two transformers, and two transformers all adopt 40MVA on -load voltage -regulating transformer, and two transformers pressure regulating respectively are the first transformer of 110KV electric pressure, the the second transformer of the 10KV electric pressure be connected with first transformer. First transformer side has two kickback lines, and first transformer side adopts the bridge connection mode. The the second transformer side has 20 kickback lines, and the the second transformer side adopts single busbar segmentation mode of connection. Due to the adoption of the technical scheme, the utility model discloses under the prerequisite of guaranteeing service reliability, economic nature, flexibility, realized that the operation is high -efficient, safeguard the convenient advantage that is showing.