35千伏变电站毕业设计

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1、摘要 变电站是电力系统的重要组成部分，它直接影响整个电力系统的安全与经 济运行，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的主要环节，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的确定，是变电站电 气部分投资大小的决定性因素。 本次设计建设一座 35KV 降压变电站，首先，根据主接线的经济可靠、运行 灵活的要求选择各个电压等级的接线方式，在技术方面和经济方面进行比较， 选取灵活的最优接线方式。 其次进行短路电流计算，根据各短路点计算出各点短路稳态电流和短路冲 击电流，从三相短路计算中得到当短路发生在各电压等级的

2、工作母线时，其短 路稳态电流和冲击电流的值。 最后，根据各电压等级的额定电压和最大持续工作电流进行设备选择，然 后进行校验并对二次改造部分进行概预算编制。 关键词：变电站 变压器 雷击防护 Abstract As is know to the learns , real circumstances of this engineering of combination are used , the analysis conscientiously careful by way of to the primary sources , as well as short circuit calcula

3、tion to decides on the scheme . The selection of the electric owner grasping the transformer substation wiring scheme , the mould selecting of major electric installation , the selection of main transformer platform number , capacity and model , as well as the various protections are surely calmly .

4、 Define finally this 110KV transformer substation electric owners wiring diagram , and accomplishes the preliminary design to the 110KV transformer substation . Designing by way of this , I have had a more overall understanding to the design of transformer substation , and makes me learn , not only the reliability will fully be thought over in the engineering designation and the flexibility , and still more will give consideration to many things economy , long-range nature and technical . T