摘要
变电所是电力系统中对电能的电压和电流进行变换、集中和分配的场所。为保证电能的质量以及设备的安全，变电所还应进行电压调整、无功补偿、潮流控制，并保障输配电线路和主要电气设备的正常运行。所以变电所电气一次部分的初步设计就显得尤为重要，它是建设一个变电所的关键环节。
本文首先根据系统原理图与所有负荷的参数，对原始资料进行分析和负荷计算，并由此确定了主变压器台数，容量及型号。接着，从安全，经济及可靠性方面考虑，确定了35kV和10kV的主接线方式。最后，根据最大持续工作电流及短路计算的计算结果，对高压断路器，隔离开关，母线，绝缘子和穿墙套管，电流互感器，电压互感器，避雷器进行了选型并根据动稳定性和热稳定性对其进行校验，从而完成了35kV变电所电气一次部分的初步设计。
关键词：变电所；变压器；主接线；电气设备选型
目录
摘要······················································3
第1章设计任务书·········································6
1.1设计题目··········································6
1.2变电所基本资料····································6
1.310kV用户负荷统计资料······························6
1.4变电所与电力系统的连接情况························6
1.5设计任务··········································6
1.6设计中采用的原始资料及数据························6
第2章无功补偿与负荷的计算·······························8
2.1无功补偿与负荷的计算······························8
2.1.1无功补偿的计算·······························8
2.1.2负荷计算·····································9
2.2主变压器容量的计算································11
2.3所用变压器容量的计算·····························11
第3章变电所主电路的设计·································13
3.1变电所电气主接线的设计····························13
3.1.1主接线设计的依据·····························13
3.1.2主接线设计的基本要求·························13
3.1.3变电所主接线设计的基本原则···················13
3.1.4变电所6—10kV侧短路电流的限制···············14
3.1.5主接线中的设备配置···························14
3.2电源进线选择与比较·······························15
3.3变电所主变压器的选择与确定·······················19
第4章电气设备的选择····································20
4.1电气设备的选择···································20
4.1.1断路器的选择·································20
4.1.2隔离开关的选择·······························21
4.1.3母线的选择···································21
4.2配电装置的选型···································22
4.2.1概述········································22
4.2.2外配电装置的安全净距························23
4.3互感器的配置·····································23
4.4继电保护的设计···································24
4.5直流系统·········································24
4.6测量表记·········································25
4.7电缆设施及电缆···································25
4.8防雷接地设计·····································25
4.8.1雷电的危害···································25
4.8.2变电所的防雷保护·····························25
4.8.3接地装置的作用·······························26
参考文献················································27
致谢····················································28
