Firstly, the type of substation is briefly reviewed in this paper. Then, based on the original data analysis of substation. the theme of main electrical wiring which can be used in this design can be determined at first. And through the analysis of the reliability, flexibility and economy of the scheme, the final choice of the theme is chosen. In order to keep the continuity of power supply, BZT device is designed. In this paper, the main devices in the first side are chosen .Through calculating short cut current and dynamic stability and thermal stability, the main electrical equipment are verified in the dissertation. Besides, important of reserve power source and its solving case is given as well. At last, this paper makes a description of whole substation’s layout of the electric equipment and thunder protection，and then, the corresponding design was given.
Because of restrict of some conditions, in the dissertation, only the primary distribution system of the substation was designed, and the secondary distribution system, this paper only gives description of BZT case, I looking forward to doing further study in the future.
Keywords: Electric main connection; Load Analysis; Short-circuit current calculation; Protection setting
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