220kV变电站一次部分设毕业论文.doc

摘 要 随着经济的发展和现代工业建设的迅速崛起，供电系统的设计越来越全面、系统，工厂用电量迅速增长，对电能质量、技术经济状况、供电的可靠性指标也日益提高，因此对供电设计也有了更高、更完善的要求。 本设计主要介绍了220kV变电站一次部分的设计。首先通过对原始资料进行分析，设计主接线形式，综合比较各种接线方式的特点、优缺点，根据电气主接线设计的基本要求选择两种较其它方案可靠的主接线方案；再对两种方案进行全面的可靠性、灵活性和经济性比较，确定最优的主接线方案；然后根据题目要求选择主变压器的台数以及容量，再进行短路电流计算，为设计中需要的高压电气设备的选择、整定、校验等方面做准备；继而进行主要电气设备的选择与校验，最后进行防雷保护设计。 关键词：变电站；主变压器；短路计算；电气设备选择。 ABSTRACT With the development of economy and the rapid rise of the modern industrial construction, design of power supply system is more and more comprehensive, system, factory power consumption increased rapidly, the power quality, technical and economic conditions, power supply reliability index is increasing, so the design of power supply also has a higher, better. This design mainly introduces the design of 220 kv substation a part. Through analyze the raw data first, design main wiring forms, comprehensive comparison of various characteristics of wiring method, advantages and disadvantages, choose according to the basic requirement of the main electrical wiring design two kinds of main wiring scheme than other solutions and reliable; Again to the reliability of the two plans to conduct a comprehensive, flexible and economical comparison, to determine the optimal main wiring scheme; Then the sets and the capacity of main transformer according to the request of topic selection, short-circuit current calculation again, needed for the design of high voltage electrical equipment choice preparation, setting, calibration, etc; And then to the main electrical equipment selection and calibration, finally carries on the lightning protection design. Keywords: substation; The main transformer; Short circuit calculation; Equipment selection. 目 录 1 引 言 1 2 电气主接线的设计 2 2.1 主接线概述 2 2.2 主接线设计原则 3 2.3 主接线选择 4 3 主变压器的选择 7 3.1负荷计算 7 3.2主变压器的选择原则 7 3.2.1主变压器台数的选择 8 3.2.2主变压器容量的选择 8 3.2.3主变压器型式的选择 9 3.2.4绕组数量和连接形式的选择 9 3.3 主变压器选择确定 10 4 短路电流计算 11 4.1 变压器的各绕组电抗标幺值计算 11 4.2 10kV侧短路计算 12 4.3 220kV侧短路计算 15 4.4 110kV侧短路计算 16 5 导体和电气设备的选择 18 5