Power transformer is stationary electric equipment in electric power system depend on electromagnetic induction that change one kind of voltage and alternating current into another voltage and electric energy of current with same frequency. The transformer used in the power grid is collectively referred to as the power transformer which is used before distribution of all levels of transformers. Transformers that lower the voltage to the working voltage of electrical equipment are called distribution transformers, which are used for daily lighting and power plants. Generally, low voltage is 0.4kv and below.
Distribution power transformer is a static electrical equipment that used to a number of ac voltage (current) into the same frequency of another or several values of voltage (current) equipment. When the primary winding is fed with alternating current, alternating flux is generated. The alternating flux ACTS through the core to induce the alternating electromotive force in the secondary winding. The level of secondary induction electromotive force is related to the number of turns of the primary and secondary winding that the voltage is proportional to the number of turns. The main function is to transmit electricity. The most energy-saving power transformer is amorphous alloy core distribution transformer. Its biggest advantage is that the no-load loss value is extremely low.