This paper mainly introduces the design of 35kV substation in south city of ZheJiang. It also discusses the choice of main wiring, high pressure equipment and all kinds of the protection of relay, the calculation of load, short current and so on in detail, especially, the choice of main wiring, transformer and some electric equipment such as circuit breaker, current and Voltage sensor. It shows main wiring of substation, the distribution of plane and some protection equipment of high and low Voltage by the graphics of CAD,VISIO.
This design is closely related to reality in order to design the suitable substation by studying a lot of materials. The design adopts some stable-form and general protections, which can make workers on duty control the situation of substation timely, operate the equipments directly, know the breakdown and deal with it without delay, so that the system of power supply is scientific and standard in management. What’s more, it can exchange data with other automatic systems and giVe full play to whole adVantage in order to manage information in all systems as a whole.
Keywords：Power supply design , Transformer switchgear ,protection of relay
