2203510KV变电所电气一次初步设计.doc

华北电力大学成人教育 毕业设计(论文) 论文题目： 变电所电气一次初步设计 学生姓名： 学号 年级、专业、层次： 函授站： 二○○ 8年 9月 220/35/10KV变电所电气一次初步设计 摘要 对变电站的设计和研究对于电力系统的安全运行和电力系统的发展都有十分重要的意义。本次毕业设计是通过对变电站一次部分的设计，巩固“发电厂电气部分”及一些相关课程的理论知识。学习和掌握变电站电气部分设计的基本方法，培养实际工程设计的基本技能及独立分析和解决问题的工作能力。 通过参考现行变电站运行标准，对题目所给定的原始资料进行分析，考察系统的容量与负荷的性质及变电站所处的环境条件，并且进行系统总容量的计算，从而确定主变压器的台数及容量。根据负荷对供电可靠性的要求拟出各种可能的接线图。根据可靠性、灵活性和经济性的要求进行比较确定最优主接线。采用半高型配电装置THE PRIMARY SYSTEM DESIGN OF 110/35/10KV STEP-DOWN SUBSTATION Abstract The design and study of electrical substations is significant to the power system’s safe operation and development. Through the design of a substation, this thesis aims to consolidate the theoretical knowledge of electrical parts plant and some relevant courses, learn and master the basic design of electrical substations methods, and cultivate self-analysis and independent problem-solving ability and basic practical engineering skills. Through the reference of existing transformer stations’ operating standards, analyses the setting original data, inspect the load character, the capacity of the system and the environmental conditions of transformer stations, and calculates the total system capacity, then determine the number and capacity of transformers. According to the load electricity reliability requirements prepare for possible connection programs. Identify the optimal scheme after comparing the requirements of the reliability, flexibility and economy. All the voltage levels use single sub-bus connection. Calculate the per unit value of the system, including the per unit value of short circuit reactance the system reduction to the voltage levels, the reactance per unit value of the transformer winding. Then draw the equivalent reactance map of the voltage levels220kV, 35kV, 10kV bus bar. Calculate the three-phase short-circuit current of all voltage levels through networki