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摘 要

电力已成为人类历史发展的主要动力资源，要科学合理的使用及分配电力，必须从工程的设计来提高电力系统的安全性、可靠性和运行效率，从而达到降低成本，提高经济效益的目的。变电站是电力系统配电传输不可缺少的重要组成部分，它直接影响整个电力网络的安全和电力运行的经济成本，是联系发电厂和用户的中间环节，起着变换和分配电能的作用。电气主接线是发电厂变电所电气部分的主体，电气主接线的拟定直接关系着全厂（所）电气设备的选择、配电装置的布置、继电保护和自动装置方式的确定，对电力系统的安全、可靠、经济运行起着决定的作用。

本设计针对110kV降压变电站进行电气部分设计，电压等级110kV/35kV/10kV；设计内容包括：变压器台数和容量的选择、主接线的选择、短路电流的计算、主要电器设备的选择和校验、继电保护及变电站防雷等。

设计中依据《电力工程设计手册，电气一次部分》、《发电厂、变电站电气部分》，《电力继电保护原理》《中小型变电所实用设计手册》《电气设备设计计算手册》 《交流高压断路器订货技术条件》、《交流电气装置的过电压保护和绝缘配合》、《高压配电装置设计技术规程》等国家和电力行业有关110kV变电所设计、标准、规程、规范及国家有关安全、环保等强制性标准。 关键词：降压 变电站 电气 设计

目 录

第一章 绪 论 ······················································································ 1

选题背景 ············································································· 1 选题意义 ············································································· 1 变电站发展概况 ···································································· 1 设计原始资料 ······································································· 2 变电站的出线 ····································································· 2 负荷情况 ··········································································· 2 线路长度 ··········································································· 2

第一节 第二节 第三节 第四节

一、 二、 三、

第二章

电气主接线设计及短路电流计算 ···················································· 3

电气主接线设计及主变压器容量选择 ········································· 3 电气主接线方案初选 ··························································· 3 主接线方案比较·································································· 3 主变压器的选择·································································· 4 站用变压器的选择 ······························································ 5 短路电流计算 ······································································· 5 短路电流的计算目的 ··························································· 5 短路电流计算点的确定 ························································ 6 计算步骤 ··········································································· 6 变压器、线路及电抗器的参数计算 ········································· 6 系统网络化简 ····································································· 8 110kV母线短路点K1的短路计算 ··········································· 8 35KV母线短路点K2的短路计算 ·········································· 10 10KV母线短路点K3的短路计算··········································· 11 10KV出线短路点K4的短路计算 ·········································· 12

第一节

一、 二、 三、 四、 第二节

一、 二、 三、 四、 五、 六、 七、 八、 九、

第三章

电气主设备的选择及校验 ···························································· 14

选择原则及规定 ··································································· 14

第一节

一、 二、 三、 第二节

一、 二、 三、 四、 五、 六、 七、

第四章

一般原则 ·········································································· 14 校核电器的基本使用条件 ···················································· 14 各回路最大持续工作电流 ···················································· 14 主设备选择及校验 ································································ 15 断路器的选择及校验 ·························································· 15 隔离开关的选择及校验 ······················································· 18 电流互感器的选择及校验 ···················································· 21 电压互感器的选择 ····························································· 26 避雷器的选择及检验 ·························································· 28 母线的选择及校验 ····························································· 30 熔断器的选择 ···································································· 32

主变保护整定计算及防雷接地计算 ················································ 34

变压器继电保护 ··································································· 34 变压器差动保护计算 ·························································· 34 变压器过流保护及过负荷保护计算 ········································ 36 防雷接地计算 ······································································ 37 防雷计算 ·········································································· 37 接地计算 ·········································································· 39

第一节

一、 二、 第二节

一、 二、

总 结 ·································································································· 41 致 谢 ··········································································· 错误！未定义书签。 参 考 文 献 ······················································································ 42 附录A 主接线方案图 ············································································· 43 附录B 系统正序等值图 ·········································································· 45 附录C 设备选择参照图 ·········································································· 46 附录D 短路电流计算结果表 ···································································· 47 附录E 变电所主体设备型号一览表 ··························································· 48