(完整版)110KV变电站主接线设计毕业设计

摘 要

变电站作为电力系统中的重要组成部分，直接影响整个电力系统的安全与经济运行。根据设计任务书的要求，本次设计为110kV变电站一次主接线的设计，并绘制电气主接线图和变电站平面布置图。该变电站设有两台主变压器，站内主接线分为110kV、35kV和10kV三个电压等级。110kV电压等级采用内桥接线，35kV和10kV电压等级都采用单母线分段接线。

首先根据主接线的经济可靠、运行灵活的要求，选择了两种待选主接线方案进行了技术经济比较，淘汰较差的方案，确定了变电站电气主接线方案。同时通过对原始资料的分析来选择变压器和无功补偿装置。其次进行短路电流计算，从三相短路计算中得到当短路发生在各电压等级的母线上时，其短路稳态电流和冲击电流的值。再根据计算结果及各电压等级的额定电压和最大持续工作电流进行主要电气设备选择及校验。

设计的内容符合国家有关经济技术政策，所选设备大部分为国家推荐的产品，技术先进、运行可靠、经济合理。

关键词：电气主接线；变压器；设备选型

Abstract

Substation as an important part of the entire power system directly affects the safety and economic operation. According to the design requirements of the mission statement, this design is a main connection 110kV substation design and draw electrical substation main wiring diagrams and layout plans. There are two main transformers in the substation in which main electrical connection can be divided into three voltage grades: 110kV, 35kV with 10kV. It deposits sectionalized single bus bar scheme per grade.

First, according to the main wiring of the reliable economy and flexible operation requirements, select the two proposed main wiring schemes for the technical and economic comparison, eliminating poor schemes, the substation main electrical wiring scheme is determined. At the same time, through the analysis of raw data to choose transformer and reactive power compensation device. Second, short-circuit current calculation, the three-phase short-circuit calculated when the short circuit occurs in each bus voltage level when the short circuit, the steady-state current and impact current value. According to the results and of the main electrical equipment selection and check the voltage level of voltage and maximum continuous working current.

The content of the design in accordance with the relevant national technical and economic policy, the selected device for most countries recommend products, advanced technology, reliable, economic and reasonable.

Key Words: Electrical main wiring, Transformer, Equipment type selection

目 录

摘 要 ....................................................................................................................................

Abstract ....................................................................................................................................

1 绪论 ........................................................................................................................................

1.1 工程背景 .....................................................................................................................

1.2 设计范围 .....................................................................................................................

1.3 设计依据 .....................................................................................................................

1.4 设计目标 .....................................................................................................................

1.5 设计任务 .....................................................................................................................

2 电气主接线设计....................................................................................................................

2.1 主接线的设计原则.....................................................................................................

2.1.1 主接线的设计依据..........................................................................................

2.1.2 主接线设计的基本要求 .................................................................................

2.2 主接线的设计.............................................................................................................

2.2.1 设计步骤 ..........................................................................................................

2.2.2 初步方案设计..................................................................................................

2.2.3 最优方案确定..................................................................................................

3 负荷计算 ................................................................................................................................

3.1 负荷计算的公式.........................................................................................................

3.1.1 低压侧负荷计算的公式 .................................................................................

3.1.2 高压侧负荷计算的公式 .................................................................................

3.2 10kV和35kV的负荷计算 ........................................................................................

3.2.1 10kV线路负荷计算 ........................................................................................