The substation is a place for transforming,concentrating and distributing the voltage and current in power system.it is the point which connecting circuits of the electric power network. The substation plays an important role in maintaining
power grid safety and power supply reliability of power system.
At present,to the design of substation usually adopt a unified design method which is standardized,normalized and modularized.not only simplify the substation design work, good for running and servicing,but also ensure the quality of design ,satisfy
demands of developing construction of electric network rapidly.
The design is refer to the part of 220kV electrical substation design.first of all,analyze the original data and choose the main transformer, based on it ,design the main wiring and short circuit calculation,at last choose equipment, then mine and the protection of earth and distribution device.