水电站毕业设计论文(学术参考)

摘要

本次毕业设计的主要任务是根据原始资料进行一个发电厂主接线的初步设计，并对其一次设备进行选择,进而对继电保护进行规划和对配电装置进行规划。设计主要内容包括：电气主接线设计、短路电流计算、主要电气设备选择、校验及配电装置初步设计和继电保护的规划等。主要的电气设备选择有：主变压器、高压厂用变压器、高压断路器、隔离开关、电流互感器、电压互感器、避雷器及母线等的选择。

电气主接线是发电厂的主要环节，故本文对数个电气主接线方案进行了技术经济综合比较，确定了一个较佳方案，并根据此方案对全厂电气设备的选择、配电装置的布置、继电保护的规划等，进行了详细的设计和说明。本设计包括六部分：电气主接线选择，电气设备选择，短路电流计算，配电装置规划，继电保护规划及其整定。

关键词：发电厂；主接线；短路电流；电气设备；配电装置；继电保护

ABSTRACT

This graduation project topic is s according to the first hand information designs a electric power plant, and mainly carries on the design to its equipment. Then design the power distribution equipment and relay protection planning. Designs the main content to include: The electrical host wiring design, the wiring design, the short-circuit current computation, the main electrical equipment choice , the verification and the power distribution equipment preliminary design and relay protection planning and so on. The main choice electrical equipment includes: The main transformer, the high-pressured factory use the transformer, the high-pressured circuit breaker, the isolator, the current transformer ,the voltage transformer, the arrester and the generatrix and so on.

Main electrical scheme is the main part of substation, so this thesis synthetically compares several main electrical schemes from technical and economic aspects and picks up one preferable scheme. According to the chosen scheme, detailed design and instruction are carried out about the electric apparatus selection, distribution equipment arrangement, relay protection, and so forth.This thesis consist of six parts：main electrical scheme select，main choice electrical equipment，short-circuit current calculation，distribution equipment arrangement, relay protection and verification on the selection short dot.

Key words: electric power plant; electrical main wiring; short-circuit current; electrical equipment; the power distribution equipment; relay protection

目录

1 前言 (5)

1.1 设计要求 (5)

1.2 设计依据 (5)

2 电气主接线设计 (6)

2.1 电气主接线概述 (6)

2.2 发电机出口接线形式的选择 (6)

2.3 220KV侧接线形式的选择 (8)

3 主变及厂用变的选择 (12)

3.1 变压器选择概述 (12)

3.2 主变选择 (12)

3.3 厂用变选择 (13)

4 短路电流计算 (14)

4.1 短路点的选取 (14)

4.2 三相对称短路计算 (14)

4.3 不对称短路计算 (19)

5 电气设备的选择 (25)

5.1 断路器的选择 (25)

5.2 隔离开关的选择 (29)

5.3 母线的选择 (32)

5.4 电流互感器的选择 (38)

5.5 电压互感器的选择 (42)

5.6 绝缘子和穿墙套管的选择 (45)

5.7 高压熔断器的选择 (47)

5.8 发电机中性点接地设备的选择 (48)

5.9 避雷器的选择 (49)

5.10 厂用电高压侧电气设备的选择 (50)

6 继电保护规划 (53)

6.1 继电保护概述 (53)