Abstract: Differentiated operation and maintenance of substation equipment is to classify equipment according to the differences in grid risk, equipment risk, equipment value and health status, utilize limited manpower, material and time resources, and formulate reasonable operation and maintenance according to equipment operation and maintenance regulations and on-site operation regulations Plan, conduct rational operation and maintenance, improve the efficiency of substation equipment operation and maintenance, and ensure the quality of operation and maintenance, so as to ensure the safe operation of equipment and power grids. The focus of differentiated operation and maintenance is equipment management and control classification, equipment operation and maintenance plan, and differentiated operation and maintenance The key is the quality of operation and maintenance. Differentiated operation and maintenance takes equipment classification as the starting point, and dynamically adjusts the equipment inspection cycle and items, so that operation and maintenance personnel know "what kind of operation and maintenance work needs to be carried out when and where.