Electricity as a secondary energy, is a kind of cannot store energy. Electricity to become the indispensable industrial production power, and widely applied to production department and daily life.Electricity transmission without substation, power by pressor substation, transmission lines, step-down transformer substation, and then you can to users. Which substation take an extremely important hub.The graduation design, the first is for the generation miller system, power system transient and steady state, relay protection and automation of electric power systems, power stations and the electric parts and related courses, to review deepened understanding of knowledge, the teachers and students of help adhere to completion of the design.