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Delivery-type substation is a new construction method and has been adopted in projects of new generation smart substation. This paper mainly introduces the prefabricated cabin smart substation and discusses several key technologies related with the secondary system, including the structure of the prefabricated cabin and the corresponding electrical interface. Focus of this paper lays on the analysis of the structure, the inside panel layout and the configuration scheme of the prefabricated cabin. Electrical interface of prefabricated cabin with other equipments is also studied.