河南理工大学毕业设计（论文）说明书
毕业设计（论文）说明书 110kV变电站电气主接线设计
摘要
随着城市化的发展，城郊已经纳入城市的发展规划，供电方面要求越来越高，特别是供电的安全性、可靠性和持续性。电网的安全性、可靠性和持续性往往取决于变电站的合理设计和配置。一个典型的变电站要求变电设备运行可靠、操作灵活、经济合理、扩建方便。
本论文设计了一个降压变电站，此变电站有三个电压等级：高压侧电压为110kV。中压侧电压为35kV，有八回出线。低压侧电压为10kV，有十四回出线。同时对于变电站内的主要设备进行合理的选型。本设计选择选择两台SFSZ11-63000/110主变压器，其他设备如断路器、隔离开关、电流互感器、高压熔断器、电压互感器和继电保护装置等等也按照具体要求进行选型、设计和配置，力求做到运行可靠，操作简单、方便，经济合理，具有扩建的可能性和改变运行方式时的灵活性，使其更加贴合实际，更具现实意义。
关键字：降压变电站；电气主接线；变压器；设备选型。
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河南理工大学毕业设计（论文）说明书
Abstract
With the development of citilization, The planning of city expanding has included the skirts of a town , The requirement of power supply is higher and higher , especially to the security、reliability and endurance .But the security、reliability and endurance of the electrical network often rely on the transformer substation’s rationality and disposition. One typical transformer substation requests the equipments in it work reliably, operate nimbly, being carried on reasonably and easy to expend .
Refer to these several reasons, in this article we devise a transformer substation for abasing voltage, which has three voltage rates: the high voltage rate is 110kV; the middle voltage rate is 35kv, which has eight routes; the low voltage rate is 10kV, which has fourteen routes. In the same time ,we select the main equipments for the transformer substation .This article select two main transformer (SFSZ11-63000/110) and other equipments, for example : breaker , isolator ,current transformer, voltage transformer, high voltage fuse , idle work compensator ,the protecting equipments and so on are also selected ,devised and disposed according to the actual fact. What’s more, we try our best to mange to make the substation work reliably, operate nimbly, be carried on reasonably and easy to be expended. So that it can close the fact more.
Keywords: transformer substation; electrical main wiring; transformer; equipment type selection.
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河南理工大学毕业设计（论文）说明书
目录
摘要 ............................................................................................................................................. I Abstract ..................................................................................................................................... II 目录 .......................................................................................................................................... III 1 概述 ........................................................................................................................................ 1
1.1 概述 ............................................................................................................................. 1 1.2 设计任务 ..................................................................................................................... 1 1.2.1 待设计变电站基本情况 ...................................................................................... 1 1.2.2 设计任务 .............................................................................................................. 2
2 电气主接线设计 .................................................................................................................... 4
2.1 主接线设计的要求 ..................................................................................................... 4 2.2 主接线设计 ................................................................................................................. 4 2.2.1 110kv主接线设计 ................................................................................................ 4 2.2.2 35kV主接线设计 ................................................................................................. 5 2.2.3 10kV主接线设计 ................................................................................................. 6
3 主变压器的选择 .................................................................................................................... 9
3.1 变压器容量和台数的确定 ......................................................................................... 9 3.2 变压器型号的确定 ..................................................................................................... 9 4 短路电流的计算 .................................................................................................................. 11
4.1 短路计算的原因与目的 ........................................................................................... 11 4.2 短路计算的条件 ....................................................................................................... 11 4.2.1短路计算原则 ..................................................................................................... 11 4.2.2短路计算的一般规定 ......................................................................................... 12 4.3 最大最小运行方式分析 ........................................................................................... 12 4.3.1最大运行方式 ..................................................................................................... 12 4.3.2最小运行方式 ..................................................................................................... 13 4.3.3基本假定 ............................................................................................................. 13 4.3.4基准值的选择 ..................................................................................................... 13 4.3.5各元件参数标幺值的计算 ................................................................................. 14 4.4 短路电流的计算 ....................................................................................................... 15 4.4.1短路计算的目的 ................................................................................................. 15
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