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Therefore, this design we will use this as the guiding principles of design to start design work. The entire design process including the step-down substation electrical design, microprocessor-based protection and the integrated automation system design, high voltage transmission line option, the design of lightning protection and grounding. We will compare a variety of related programs to determine the best design.35kV substation integrated automation system for unattended form, the design shall be subject to the power grid dispatching automation design, its configuration, features include the arrangement of equipment shall meet the power grid security, high-quality, layered economic operation and information transfer, the total resources the principle of entitlement. Therefore, this design we will use this as the guiding principles of design to start design work. The entire design process including the step-down substation electrical design, microprocessor-based protection and the integrated automation system design, high voltage transmission line option, the design of lightning protection and grounding. We will compare a variety of related programs to determine the best design. The design aimed at 35KV substation, through the analysis of raw data for the corresponding calculation, to determine the number and capacity of transformers, to draw the main cables, and complete the selection and calibration of electrical equipment, relay protection and automatic device configuration, and lightning protection and grounding, the site selection of the design, including the entire design of the electrical part of the important content. Keyword: Electrical design, integrated automation, microprocessor-based protection, lightning protection, high-tension line