(完整版)2×300MW发电厂厂用电电气部分毕业设计论文

优秀论文 审核通过 未经允许 切勿外传

摘 要

本毕业设计是对发电厂厂用电进行设计，主要运用发电厂电气部分、高电压技术、电力系统分析、电力系统自动化、电力系统继电保护等专业知识完成“发电厂厂用电的设计”，具体设计内容包括厂用电接线设计、负荷分析计算、变压器选择、电动机自启动校验，继电保护设计、配电装置设计、防雷设计、绘制厂用电接线图、继电保护二次回路接线图、绘制配电装置图。本设计严格遵循发电厂电气部分的设计原则，并结合实际情况确定了厂用电母线电压等级确定为6KV，利用换算系数法进行负荷分析计算，变压器选择低压分裂三绕组变压器，确定了合适的短路点进行短路电流计算。根据防雷保护要求确定避雷器；最后绘制了相关的图纸。 关键词：发电厂；变压器；继电保护；避雷器

ABSTRACT

The text is designed towards the electricity power plant, using electrical power plants, , power system protection, and other expertise to complete, “Power Plant power of design” mainly. Specific design elements including electricity cable plant design, load analysis, the choice of transformers, motors start checking, protection design, distribution design, mine design, drawing electricity plant wiring diagram, the second circuit protection wiring diagram, mapping distribution setup. The design follows strickly to the design principles of the electrical power plants, combined with the actual situation identifying the bus voltage electricity plant as 6 KV, using conversion factor method to calculate the load, transformer chooses the low-voltage winding. Fix the appropriate short-circuit point to calculate the short-circuit current.

Key word: power plant; transformer; relay protection; arrester

目 录

0 前 言 ......................................................................................................................................

1 厂用电电压等级确定及接线设计 ........................................................................................

1.1 厂用电的电压等级确定 .....................................................................................

1.2 厂用电接线设计 .................................................................................................

2 厂用电负荷计算及变压器选择 ............................................................................................

2.1 厂用电负荷的计算原则 .....................................................................................

2.2厂用负荷的计算方法 ..........................................................................................

2.2.1 换算系数法..............................................................................................

2.2.2 电动机计算功率确定 .............................................................................

2.3 厂用变压器的选择 .............................................................................................

2.3.1 额定电压..................................................................................................

2.3.2 厂用变压器的容量 .................................................................................

3 电动机的自启动校验 ............................................................................................................

3.1 电动机自启动校验定义 .....................................................................................

3.2 电动机自启动分类 .............................................................................................

3.3 电动机自启动校验 .............................................................................................

3.3.1 电压校验..................................................................................................

3.3.2 电动机自启动母线电压校验 .................................................................

4 短路计算及电气设备选择 ....................................................................................................

4.1 短路计算的目的及意义 .....................................................................................

4.2 短路计算 .............................................................................................................

4.3 电气设备选择的要求和原则 .............................................................................

4.4 校验的原则及热稳定条件 .................................................................................

4.5 环境条件 .............................................................................................................

4.6 电气设备的选择 .................................................................................................

4.6.1 断路器参数的选择 .................................................................................

4.6.2 隔离开关参数的选择 .............................................................................

4.6.3 形式选择..................................................................................................

4.6.4 电流互感器的选择 .................................................................................

4.6.5 电压互感器的选择 .................................................................................

4.7 母线的选择 .........................................................................................................

4.7.1 母线材料、形式、和布置方式的选择 .................................................

4.7.2 母线选择计算 .........................................................................................

5 继电保护总体方案 ................................................................................................................

5.1 主变压器保护规划 .............................................................................................

5.2 变压器保护 .........................................................................................................

5.3 母线保护 .............................................................................................................

5.4 厂用母线保护应满足的要求 .............................................................................