摘要：本次的设计对象是某铁路牵引变电所110/27.5kV电气一次设计。铁路牵引变电所在铁路中拥有很重要的地位，对铁路机车的运行提供牵引能量。设计目的是为了将自己所学的专业知识运用到实际生活中。同时增强自己的学识与自学能力。对铁路牵引变电所电气一次设计的基本方法有所了解。

　　　本设计是通过自学牵引变电所的相关知识，以及运用了以往学习的专业知识，最终完成了某铁路牵引变电所110/27.5kV电气一次设计。本次设计是在华静老师的悉心指导下完成的。一下是设计的主要内容：

　　　根据条件选择牵引变电所一次接线设计部分的接线方法，并画出一次接线设计图；

　　　根据设计条件进行短路计算；

　　　根据设计条件进行器材选择和校验，并且进行防雷计算；

　　　最终完成设计，并对工作过程加以分析。

　　　本次设计中除使用传统方法外，还应用了CAD画图软件进行绘图。在有限的时间里完成了某铁路牵引变电所110/27.5kV电气一次设计，取得了比较满意的效果，达到了预期的设计意图。

　　　通过设计，学习到了牵引变电所的知识，以及器材校验的基本方法。

关键词：牵引变电所；工厂供电；高压电技术；外桥接线

Abstract：This design object is a railway traction substation 110/27.5 kV electrical a design. Railway traction substation in railway has a very important position, to provide the railway locomotive running traction energy. The design purpose to be their own major knowledge applied to real life. At the same time enhance their learning and self-study ability. For railway traction substation electrical once understand the basic design method.

This design is through self-study traction substation of relevant knowledge, and the use of the previous study specialized knowledge, finally completed certain railway traction substation 110/27.5 kV electrical a design. This design is in HuaJing teacher of meticulous guidance finish. It is the design of the main content:

According to the condition choose traction substation a wiring design part of wiring method, and draw a connection design;

According to the design conditions are short circuit calculation;

According to the design conditions for equipment selection and calibration, and lightning protection calculation;

Final design, and the working process of the analysis.

This design in addition to the traditional method to use the application of CAD drawing software to drawing. In the limited time completed certain railway traction substation 110/27.5 kV electrical a design, has obtained the satisfactory effect, achieve the expected design intent.

Through the design, learning to traction substation of knowledge, as well as the basic method of the equipment calibration.

Keywords: Traction substation; The factory power supply; High technology; The bridge connection.