Abstract:

The construction objectives of new generation of smart substation, which are “highly integrated system, reasonable structure and layout, advanced and applicable equipment, economical, energy saving and environmental protection, support of integrated control”, put forward new requirements for all aspects of smart substation construction. The general layout of electrical system is one of the important contents of substation design, which can significantly reflect the reasonable structure and layout of substation. Combined with the actual situation of engineering construction, this paper collated the ideas of general layout optimization of the electrical system, organized and summarized the influence factors of the layout of power distribution unit and electrical system. Based on the applications of the new equipments and techniques, such as the optimization of the main electrical wiring, the integrated smart devices, and container type building, this paper proposed the optimization design scheme with taking the typical schemes in general design as boundary conditions, and technically compared the scheme with current smart substation. Finally, the direction of layout optimization for four types of new smart substations was proposed, including 220 kV outdoor air insulated switchgear （AIS）, 220 kV outdoor gas insulated switchgear （GIS）, and 110 kV outdoor AIS, GIS.

Key words: new generation smart substation, isolated circuit breaker, container type building, gas insulated switchgear （GIS）, gas insulated busbar, power distribution unit, layout