A single-phase isolation transformer is a transformer whose primary winding is a single-phase winding. The primary winding and secondary winding of a single-phase transformer are wound on the iron core. The primary winding is the AC voltage input terminal, and the secondary winding is the AC voltage output terminal. The output voltage of the secondary winding is proportional to the number of turns of the coil. A single-phase transformer can convert high-voltage power supply into single-phase low-voltage for use in various equipment. For example, AC 6600V high voltage can be converted into AC 220V low-voltage through a single-phase transformer to supply power for lighting or other equipment. The single-phase transformer has a simple structure, With the advantages of small size and low loss, it is suitable for use in low-voltage distribution lines (below 60Hz) with less load.