随着国家电网公司智能变电站建设的不断推进和深化，按照新一代智能变电站“系统高度集成、结构布局合理、装备先进适用、经济节能环保、支撑调控一体”的指导思想，结合重庆大石220 kV新一代智能变电站试范工程的特点，在设备集成技术和优化布置方案方面开展研究，明确新一代智能变电站中一、二次设备的设计原则，提出采用隔离式断路器、气体绝缘开关柜、气体绝缘母线、层次化保护控制系统、集装箱式设备的设备选择方案，给出大石变电站主接线及总平面优化设计方案，同时对站内采用高度集成化的设备进行技术经济综合比较，以供同类工程参考。

With the continuous advancement and deepening of smart substation construction in State Grid Corporation, according to the guidance of new generation smart substation with "highly integrated system, rational layout, advanced and applicable equipments, energy conservation and environmental protection, and supporting integrated control," the technology of equipment integration and layout optimization was studied, combined with the feature of Dashi 220 kV new generation smart substation. Then, the design principles of primary and secondary equipments of smart substations were explicitly stated, the scheme of equipment selection among disconnecting circuit breaker, gas insulated switchgear, gas insulated busbar, hierarchical protection & control system and container-type equipment was proposed. Finally, the main wiring diagram and optimization design of general layout were presented for Dashi substation, and technological and economic analysis was carried out on the highly integrated equipments in smart substation, which would provide references for similar substation design in future.