2013年必威体育精装版版发电厂电气部分课程设计.doc

目 录 设计任务书（置于目录前）·········································1 摘要·······························································3 引言·······························································4 1系统与负荷资料分析·············································5 2电气主接线·····················································6 2.1主接线方案的选择···············································6 2.2 主变压器的选择与计算···········································9 2.3厂用电接线方式的选择···········································11 2.4 主接线中设备配置的的一般规则··································13 3短路电流的计算··········································14 3.1短路计算的一般规则·············································14 3.2短路电流的计算·················································15 3.3短路电流计算表·················································16 4电气设备的选择···········································17 4.1电气设备选择的一般规则·········································17 4.2电气选择的条件·················································17 4.3电气设备的选择·················································20 4.4电气设备选择的结果表···········································22 5*配电装置················································23 5.1配电装置选择的一般原则·········································23 5.2配电装置的选择及依据···········································25 结束语····················································26 参考文献··················································27 附录Ⅰ：短路计算··········································28 附录Ⅱ：电气设备的校验····································33 附录3：设计总图··········································39 系统与负荷资料分析 根据原始资料，本电厂是中型发电厂，比较靠近负荷中心。本电厂要向本地区的各工厂企业供电，还要与220KV系统相连，并担负着向市区供电，保障市区人民生产和生活用电的责任。由于本厂的地理位置优越，一般情况下都容易获得燃料，能确保本地区以及附近的工厂、市区的正常供电，还可以向220KV提供电能。 由资料我们可知，本电厂以110KV的电压等级向用户送电。这里有两电压等级，分别是110KV，有8回出线；220KV，有10回出线，全部负荷有Ⅰ、Ⅱ、Ⅲ级负荷。 1.1 220KV电压等级 架空线10回，I级负荷，最大输送200MW，TMAX=6000h/a；cos=0.85。出线回路数大于4回且为I级负荷，应采用双母带旁路或一台半。 1.2 110KV电压等级 架空线8回，Ⅰ级负荷，最大输送180MW，TMAX=6000h/a；cos=0.85。出线回路数大于4回且为I级负荷，为使其出线断路器检修时不停电，应采用双母分段或双母带旁路，以保证其供电的可靠性和灵活性。 总装机容量16000MW，短路容量1000