摘要:随着社会的发展和科技的进步，电力在各行各业中的运用越来越广泛，也就需要更多的变电站。同时变电站的无人化已是一种趋势。实现无人值班变电站既是降低电力系统运行成本，也是提高电能质量的重要手段之一。

　　　本设计主要进行35kv/降压变电站及无人值班的初步设计。在设计中遵循可靠、经济、实用的设计原则进行变电站的布置和设备的选用，设计的内容力求概念清楚，层次分明。主要内容包括，电气主接线的设计和选择、负荷计算及变压器的选择、短路电流的计算、导线的选择、电气设备的选择（母线、断路器、隔离开关、互感器、熔断器）、继电保护配置、变电所调度自动化系统的设计等。

　　　附件包括：变电站电气主接线图、变电站自动化系统结构图、主要设备配置清单、短路电流计算表。

关键词：降压变电站；无人值班；综合自动化系统；电气主接线；开关柜

ABSTRACT:With the development of the society and the progress of science and technology, the electric power used in all walks of life more and more widely, also requires more substation. At the same time the unmanned transformer substation is a kind of trend. Realize the unattended substation is not only reduce the cost of power system operation, it is also one of important means to improve the quality of electric energy.

      This design mainly for 35 kv / 10 kv unmanned step-down substation design. In follow in the design of reliable, economic and practical design principles of substation layout and equipment selection, design to the content of the concept is clear, distinct. Mainly includes the main electrical wiring design and selection, load calculation and the selection of transformer, the calculation of short-circuit current, wire selection, selection of electrical equipment (bus, circuit breaker, isolating switch, current transformer, fuse), dispatching automation system of substation design.

     Accessories include: substation main electrical wiring diagram, 35 kv substation layout, side into the profile line interval.

Key words: step-down substation; No one on duty; Integrated automation system; The main electrical wiring; Switch cabinet .