润色主变压器采用三相或是单相主要考虑变压器的制造条件、可靠性要求及运输条件等因素。由于大型变压器随着容量的增大尺寸和重量也增大。所以当发电厂与系统连接的电压等级为500kV时 300MW机组单元连接的主变压器综合考虑运输和制造条件经技术经济比较采用三相变压器。

The main transformer can be either three-phase or single-phase, depending on factors such as manufacturing conditions, reliability requirements, and transportation conditions. As the capacity of large transformers increases, so does their size and weight. Therefore, when the voltage level connected to the power plant and the system is 500kV, and considering transportation and manufacturing conditions, a three-phase transformer is chosen for the 300MW unit connection of the main transformer after technical and economic comparison