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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站电气设备的选择、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110kV变电站，首先要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。
关键词：变电所，主接线，电网，短路电流计算，电气设备选择
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Abstract
Substation is an important part of power system, it directly affects the whole power system security and economic operation of power plants and users, are linked to the intermediate link, plays a transformation and distribution electricity role. The main electrical wiring is the key link in power substation, the main electrical wiring relates directly to the total worked electrical equipment choice, power distribution equipment arrangement, relay protection and automatic device sure electrical transformer stations, is the decisive factor of the partial investment.
This design building a substation, according to the first 110kV Lord wiring the economical and reliable, flexible operation requirement and the choice of all the connection mode of voltage level in terms of technology and economy, pared the optimal selection flexible connection mode.
Next to short-circuit current calculation, according to each short-circuit point calculate steady current and various points short-circuit current, short-circuit impact from the three-phase short-circuit calculation short-circuit happened in each get when the bus volta