Power grid transformation is: power grid renewal and transformation, as well as measures to update and transform transmission and distribution systems. The traditional power grid structure is weak, the lines and equipment are outdated, the power consumption of distribution transformers is high, the reactive power compensation ability of lines is insufficient, and the loss rate of transmission and distribution is high. Through the transformation, the power loss can be reduced and the power supply quality can be improved. The main content of the transformation is to transform and replace the old distribution equipment in view of the serious aging of power lines, outdated distribution equipment and many potential safety hazards.