毕业论文330kV变电站电气主接线设计.doc

毕业设计

题目：330kV变电站电气主接线系统设计

摘要

变电站是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济运行，是联系发电厂和用户的中间环节，起着变换和分配电能的作用，在全国电网中占有特别重要的位置。对变电站进行合理的规划和科学的设计是保证供电质量的前提和基础。

本设计为330kV变电站设计，330kV变电站设计最终为3台主变压器，首期投产建设1台。综合考虑工程初期和长期运行的费用，追求设备寿命期内最优的经济效益，分为主变压器选择、主接线技术经济比较、短路电流计算、电气设备的选择等几部分，同时附有电气主接线图等图纸加以说明。站内主接线分为330kV、110 kV、和35 kV三个电压等级；各个电压等级分别采用双母线、双母线和单母线的接线方式；短路电流选取三个电压等级处为短路点进行计算，并介绍了短路电流的危害和产生原因；在电气设备的选择上以各种元器件参数选择为主。此外，还对导线、绝缘配合、过电压保护等方面进行了简单的设计，使变电站电气一次部分基本完成。

关键词：330kV变电站主变压器短路电流电气主接线

Abstract

Substation is an important part of the power system, which directly affects the entire power system security and economic operation .It is the intermediate links contracting the users and the power plants, and it has the function of transformation and distribution of electric energy, which plays a particularly important role in national power grid. Reasonable substation planning and scientific design is to ensure the prerequisite and basis for power quality.

The design is for the 330kV substation, the substation is finally a design of 3 sets of the main transformer, one set will be currently put into building. Considering the engineering costs of the initial and long-running period to pursuit the best economic interest during the use time of the equipment, this design is divided into following parts, the main transformer selection, main connection technological and economic comparison , short circuit current calculation and selection of electrical equipments, accompanied by drawings of main electrical wiring diagram to illustrate this. The main terminal station is divided into three voltage level, 330kV, 110 kV, and 35kV ;Various voltage levels is respectively divided into dual bus, dual-bus and single bus terminals; Select points which is at three voltage levels for the short-circuit calculations, and describe the causes and harm of short-circuit current; The main point of

the selection of electrical equipment is to choose the main parameters of the various components. In addition, she will put up with the simple design the of wire, insulation coordination, overvoltage protection and grounding aspects, so that the design of the first part of an electrical substation would be basically completed

Key Words：330kV substation main transformer short circuit current calculation main electrical wiring

目录

第一章绪论 (1)

1.1 330kV变电站设计的研究意义 (1)

1.2 330kV变电站国内外研究现状综述 (1)

1.3 本设计的研究内容 (2)

第二章原始资料分析 (3)

第三章主变压器的选择 (4)

3.1 概述 (4)

3.2主变压器台数、型式的选择 (4)

3.3 站用变压器的选择 (5)

3.4 本章小结 (6)

第四章变电站电气主接线设计 (7)

4.1电气主接线的基本要求 (7)

4.2电气主接线的设计原则 (7)

4.3主接线类型分析 (7)

4.4 主接线方案技术经济性比较 (10)

4.5 本章小结 (11)

第五章短路电流计算 (12)

5.1 短路电流的计算目的 (12)

5.2 短路电流计算的步骤 (12)

5.3 短路电流计算取值 (12)

5.3.1 电抗标么值计算 (13)

5.3.2 短路点的计算 (16)

5.4 本章小结 (19)