Control transformer

Disclosed is a control transformer, comprising a primary winding, a secondary winding and a square-shaped iron core. The primary winding and the secondary winding respectively corresponding to an inner layer and an outer layer are arranged on a core column of the iron core. The primary winding, the secondary winding and the square-shaped iron core are filled with an epoxy resin and packaged in an epoxy resin shell. Pins at two ends of the primary winding are respectively passed through A/B-phase epoxy resin column in the upper end of the epoxy resin shell and respectively connected with corresponding binding screws. The outgoing lines at two ends of the secondary winding coil are connected with connecting terminals correspondingly arranged on a terminal plate. The utility model realizes a reduced 60 per cent of no-load loss, thus not only reducing the loss and saving the energy but also enhancing the anti-saturated capacity of the iron core. The utility model is a full-sealing structure, thus accomplishing th