论文总字数：51810字

摘 要

第一章 绪论········································ 1

1.1 选题背景······································ 1

1.2 我国电力系统的基本概况································ 1

第二章 变电站总体结构设计论证······························ 2

2.1 电气主接线的设计原则································· 2

2.2 电气主接线方式设计的基本要求···························· 3

2.3 变电站主设备选型基本设计方案···························· 4

第三章 变电站一次系统设计································ 5

3.1 变压器的选择···································· 5

3.2 电气主接线的设计·································· 8

3.3 短路电流计算···································· 9

第四章 电器设备的选择·································11

4.1 电器设备选择的条件·································11

4.2 高压断路器的选择··································13

4.3 隔离开关的选择···································14

4.4 普通电抗器的选择··································14

4.5 电流互感器的选择··································16

4.6 电压互感器的选择··································18

参考文献········································20

附录··········································21

程序设计········································21

计算书·········································48

摘要

降压站主结线的设计，运行要求满足可靠性、灵活性两方面，其技术要求可能存在不确定性，首先考虑的是其经济性，此为重中之重。选择一次设备，使它不仅能够满足正常运行时的要求，而且要经得住短路电流的考验，变电所自身有哪些功能，建设时的投资，其在运行时的性能，以及损耗后的维护和供电的可靠程度，都与电气设备的选择息息相关。此次课题的目的是为了让我们熟练掌握降压站如何设计，对以后从事的相关工作有很大益处。

关键词：降压站；设备选型；可靠性；灵活性

Summary

The design and operation requirements of the main junction line of the step-down station meet the reliability and flexibility, and the technical requirements may be uncertain. The first consideration is its economy, which is the most important. The selection of primary equipment not only enables it to meet the requirements of normal operation, but also to withstand the test of short circuit current, what functions the substation itself has, the investment in construction, and its performance in operation. And the reliability of maintenance and power supply after loss are closely related to the selection of electrical equipment. The purpose of this project is to let us master how to design the pressure-relief station, which is of great benefit to the related work in the future.

Keywords: step-down station; equipment selection; reliability; flexibility

明全十一万伏降压站主设备选型与应用程序设计

第一章 绪论

1.1 选题背景

电力系统的主要组成部分其中包括了变电站等，它的运作需要安全与经济并行，发电厂和用电户的连接中起着至关重要的作用，电能的转换和输送等都需要变电站在其中起作用。变电所在发电厂中的中心环节是其主接线的那部分，电气设备的选择，如何分配选择配电装置，保护以及自动装置等的选择，都与主接线的确定有直接关系，其决定了变电站的总费用的多少。变电站主接线包括了：110kv，35kv，10kv，这些接线形式是通过我们对变电站的大致布局及它的出线，其中还要仔细观察用户资料，主接线有哪些形式需要选择，配电装置又存在哪些结构，不仅要依照已知的基础资料，还要参照其与系统如何以及输送功率联系起来。此次设计的110kv变电站，其完成情况也要参照主变的选择、好坏、质量如何等情况。

1.2 我国电力系统的基本概况

中国，地大物博，土地面积大，因此所有的电网全放在一起不太现实，所以有六大电网。北方有东北电网，中部是华北电网、华中电网、华东电网，西藏新疆等地被设为西北电网，以上的五个电网都是国家级电网。中国南方的电网仅有一个：南方电网；此电网由南方电网公司管理。这种按区域分配既做到了因地制宜，又方便了管理。据了解，不同区域较大的电网如华中电网，华北电网是由一些省份的地级市电网组成的。全国电网的主要部分为华中电网，我国特色的西电东送项目便是由其来担任。

我国中部的华北电网与北方的东北电网和华中电网连在一起，此举措体现了我国电网较好的连接性。

第二章 变电站总体结构设计论证

2.1 电气主接线的设计原则

根据查阅资料得知此次电气主接线所需要遵循的原则如下:

剩余内容已隐藏，请支付后下载全文，论文总字数：51810字