1、 摘 要 随着我国工业的发展，各行各业对电力系统的供电可靠性和稳定性的要求日益提 高。变电站是连接电力系统的中间环节，用以汇集电源、升降电压和分配电能。变电站 的安全运行对电力系统的稳定运行至关重要。 本文根据收集的原始材料进行 220kV 变电站的设计。主要内容包括：变电站电气主 接线的设计和选型、短路电流的计算、主变压器和电器设备的选型及防雷设计。论文根 据持续工作电流及短路计算的结果，对主要电气设备进行了选型设计；其中电器设备的 选择主要包括：断路器、隔离开关、PT、CT、母线、避雷器等。 关键词：电气主接线，主变压器，设备选型 Abstract Along with the conti
2、nuous developing of agriculture and industry in our country, every walk of lifes demand of reliability and stability towards electric power system .They are used to connect the power supplies ascengd or descend the electric voltage or distribute electric power. Its very important to the stable opera
3、tion of the power system that the substation works safely. This paper main focus on the designing of primary power system in 220kVstep-down substation, according to the collection the raw material. The main contents are as follows: the designing and selecting main electrical connection of substation
4、, calculation of short-circui, current, selecting of main transformer and electrical equipments primarily, over voltage protection, lightning protection design, the two system design.According to calculation results of continue working current and short circuit, this paper completed the selection of main electrical equipment. includes: circuit-breaker, disconnecting switch, potential transformer, current transformer, busbar, lighting arrestor etc。 Keywords: Main electrical connection ，main tr
