The three-phase unbalanced load in power distribution area will have adverse effects on power supply safety

power supply quality and economic operation of distribution network is one of the urgent problems to be solved in the weak links of power distribution network. At present

the most direct and effective technical measure for controlling the three-phase imbalance of the area is dynamically changing the phase sequence of single-phase load and controlling the three-phase imbalance within the specified range. In this paper

the mathematical model of phasing rotation is established

the phasing rotation strategy is analyzed in detail and the experiment zero switching phasing and engineering application of distribution area are performed by the use of three-phase load imbalance auto phasing device based on phasing rotation technology.It is shown by the experimental result that the control of phasing rotation control technology to the threephase load imbalance of distribution area is feasible.