Abstract
The electrical power system is a very important energy department in the national economy, and the substation’s design is an essential project in the electric power industry’s construction. According to national design standards and norms ,a 110kV transformer substation was designed ,the Voltage rating was 110/35/10kV.On the basis of the design requirements to calculate the load of the substation，and then to ascertain the number, capacity and model of the main transformer, furthermore ,to ascertain transformer substation’s main wiring. In accordance with the result of maximum continuous operating current and the calculation of short-circuit current to choose high voltage circuit breaker, isolating switch, busbar ,voltage transformer ,current transformer as well as other equipment and the instrument And then to check those equipments whether conform the requirements .After that system of relay protection should be chosen , and lightning protection should be designed .In the end, the electrical papers should be drawn by Auto CAD and Visio. A strong energy requirements of economic development would be supplied by the transformer substation’s design ,and promote the development of national economy.
Keywords：substation design、a system design、110kV substation、power supply design
