Abstract:At present, in the research of distribution transformer modification and adjustment, most of them are around the overhaul of high energy consumption or old transformer to prolong life. In the case of only one alternative distribution transformer, The original transformer is directly replaced by a lower loss transformer to reduce the cost. And through the comparison of these two aspects, the transformation plan can be determined. When there are a variety of alternative transformers, this paper proposes a replacement strategy of high energy consumption distribution transformer based on life cycle cost. Which based on the life cycle cost of equipment level, a comparison model of planning schemes is constructed, and the replacement strategy proposed in this paper is evaluated. The objective is to minimize the economic cost, meet the needs of energy saving and emission reduction, and reduce the cost of fault disposal. The most reasonable transformation mode and the best replacement opportunity are obtained, and finally the relevant strategies are adopted. Examples verify the feasibility and effectiveness of the strategy, and verify that LCC can be reduced by choosing low energy consumption transformers and using reasonable maintenance methods from the perspective of life cycle cost, which can improve the economy and reduce the planning investment cost of power grid.