The single phase transformer has simple structure, small volume, low loss, low iron loss is suitable for using in low load density of low voltage network. The single transformer is complement form which use in some specific field out of constraints of their own characteristics.
Single phase transformer is used for power supply. High voltage branch lines can be installed in two lines and low voltage lines can be installed in two or three lines. It could save lots of electric wires, arrester, holder when it adopt the single phase transformer. Form the project cost, construction of single-phase transformer power supply high-voltage line can save 10% engineering cost and construction of low-voltage line can save 15% engineering cost.
Single-phase transformer is suitable for small capacity dense point of power supply, objectively will greatly increase the number of users. From the point of view of statistics, the base of reliability calculation is increased which is beneficial to the improvement of reliability coefficient of power supply. During load tension and power limitation, the work of single distribution transformer pulling circuit will reduce the power failure range, and also reduce the influence on the power supply reliability of users. The popularization and use of single-phase transformer is an important measure to realize small capacity, short radius and dense point. The iron loss of single-phase transformer is 5%-10% less than that of three-phase transformer of the same capacity. The installation of single-phase transformer goes deep into load center which shortens the low-voltage line and reduces the loss of low-voltage line. Single-phase transformer is easier to achieve capacity and load matching. Especially, the effect is more obvious when eliminating high energy consumption.