摘要电力工业的发展是国民经济各个方面协同推进的强劲动力，它的现代化指标是反映一个国家综合国力的重要标志。电力工业有两个核心环节，发电侧是电厂，输配电侧是变电所，变电所是一个汇集电能，变换电压等级和分配电能的场所，是联系发电厂和负荷侧的纽带，通常分为升压和降压两种。本文就是针对XX地区实际情况，结合220kV降压变电所设计规范和流程，对XX地区220kV降压变电所进行了电气初步设计。本设计的内容主要涉及了以下几个方面：变电站的主变压器的台数和容量的选择；电气主接线设计，并用CAD制图软件绘制变电所电气主接线图和220kV侧高压配电装置平面图；对整个系统进行了必要的短路电流计算；根据短路计算的结果选择和校验所需的电气设备；母线系统设计和校验；进行继电保护、防雷保护、变电站所用电的初步规划设计。64365

毕业论文关键词  220kV变电站  电气主接线  短路计算  电气设备选择

毕业设计说明书（论文）外文摘要

Title         Design of the 220 kV step-down substation        

Abstract Development of power industry is the collaboration to promote all aspects of the national economy's strong momentum, and its modernization indicators reflect a country's comprehensive national strength important symbol. There are two core aspects of the power industry, power generation side is the power plants, transmission and distribution side is the substation, substation is a collection of electrical energy, transform voltage levels and distribution of electric energy sites, power plants and load side is linked bond, usually is pided into two kinds of boost and buck. This article is for the XX local conditions, combined with the 220kV substation design specifications and processes buck, buck 220kV substation for XX region conducted a preliminary design of the electrical. The main contents of this design involves the following aspects: the main transformer substation number of units and capacity choices; main electrical wiring design, and CAD drawing software to draw Substation 220kV main electrical wiring diagram and side high voltage electrical installations plan; right the entire system for the necessary short-circuit current calculation; calculated based on the results of short-circuit selection and verification required electrical equipment; busbar system design and verification; carry protection, lightning protection, electrical substation preliminary planning and design.

Keywords  220kV Substation   Main Electrical Connection Scheme Short Circuit Calculation  Electrical equipment Selection

 目   录

1  绪论 1

2  设计任务 2

2.1  原始资料 2

2.2  设计任务 3

3  主变压器的选择 3

3.1  主变压器的选择原则 3

3.2  变压器台数选择 4

3.3  主变容量计算和选择 4

4  电气主接线设计 6

4.1  电气主接线的设计原则和基本要求 6

4.2  主接线的方式选择 6

5 变电所短路电流计算 10

5.1  短路计算的假设及步骤 10

5.2  短路电流计算 11

6 导体和电气设备选择与校验