110KV降压变电所电气部分的设计

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 第一节 选题背景 ······················································ 1 第二节 选题意义 ······················································ 1 第三节 变电站发展概况 ············································· 2 第四节 设计原始资料 ················································ 2

一、 变电站的出线 ·············································· 3 二、 负荷情况 ···················································· 3 三、 线路长度 ···················································· 3

第二章 电气主接线设计及短路电流计算 ···························· 4 第一节 电气主接线设计及主变压器容量选择 ·················· 4

一、 电气主接线方案初选 ····································· 4 二、 主接线方案比较 ··········································· 5 三、 主变压器的选择 ··········································· 5 四、 站用变压器的选择 ········································ 7 第二节 短路电流计算 ················································ 8

二、 短路电流计算点的确定 ·································· 8 三、 计算步骤 ···················································· 8 四、 变压器、线路及电抗器的参数计算 ··················· 9

五、 系统网络化简 ············································· 11 六、 110kV母线短路点K1的短路计算 ····················· 12 七、 35KV母线短路点K2的短路计算 ····················· 14 八、 10KV母线短路点K3的短路计算 ····················· 15 九、 10KV出线短路点K4的短路计算 ····················· 16

第三章 电气主设备的选择及校验 ···································· 19 第一节 选择原则及规定 ············································ 19

一、 一般原则 ··················································· 19 二、 校核电器的基本使用条件 ······························ 19 三、 各回路最大持续工作电流 ······························ 19 第二节 主设备选择及校验 ········································· 20

一、 断路器的选择及校验 ···································· 20 二、 隔离开关的选择及校验 ································· 25 三、 电流互感器的选择及校验 ······························ 29 四、 电压互感器的选择 ······································· 37 五、 避雷器的选择及检验 ···································· 41 六、 母线的选择及校验 ······································· 43 七、 熔断器的选择 ············································· 47

第四章 主变保护整定计算及防雷接地计算 ························ 49 第一节 变压器继电保护 ············································ 49

一、 变压器差动保护计算 ···································· 49 二、 变压器过流保护及过负荷保护计算 ·················· 52

第二节 防雷接地计算 ··············································· 53

一、 防雷计算 ··················································· 53 二、 接地计算 ··················································· 56

总 结 ······································································ 58 致 谢 ··············································· 错误！未定义书签。 参 考 文 献 ·························································· 60 附录A 主接线方案图 ·················································· 61 附录B 系统正序等值图 ··············································· 63 附录C 设备选择参照图 ··············································· 64 附录D 短路电流计算结果表 ········································· 65 附录E 变电所主体设备型号一览表 ······························· 67

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