Electric power industry is the mainstay of the modern industry in China, which influences the industrial development of other industries. Electricity is produced and used esaily，but the power can not be stored massly. So the distribution and transport of electric power are particularly important. Reasonable allocation and transmission of electricity is helpful to improve the utilization efficiency and reduce cost. As one of the infrastructure which belong to the development of electric power industry,substation is indispensable. So a safe and efficient substation can help to improve power transmission efficiency and reduce unnecessary energy loss，so that the utilization coefficient of electricity would be greatly improved.
The design of the energy mainly aimed at the reasonable distribution and transport of electric power. Firstly the unit load shold be computed which is belong to this transformer substation.Then a appropriate network wiring schemes should be chosen through the unit load, including the right type of transformer capacity, sets and reactive power compensation devices should be chosen. The network wiring schemes should be made out by above all. Through the short-circuit current calculation, the high-voltage line, relay protection device and lightning protection device should be selected.
keywords： primary side，transformer，reactive power compensation，short-circuit current
