某110KV终端变电所电部分设计毕业设计说明书.doc

毕业设计说明书 题 目：某110KV终端变电所电气部分设计 专 业： 电气工程及其自动化 学 号： 姓 名： 指导老师： 时 间： 摘 要 变电所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。本设计一个110KV终端降压变电所，首先根据各个电压等级的负荷进行计算变压器的容量，选取主变压器的台数﹑型号及其容量等各个参数。其次根据主接线的可靠性及其运行的灵活性，选择各个电压等级的的接线方式。并从经济和技术方面进行比较，选取最优接线方式。再次,根据主接线选择短路点，并画出等值网络图进行短路计算，根据各短路点计算出三相短路电流，短路容量，短路冲击电流的值。最后根据短路计算选取各个电压等级的母线，断路器，隔离开关，电流、电压互感器，避雷器，并进行校验,同时还做了变压器的继电保护;并简单的做了防雷保护。 关键词：主接线；短路电流；电气设备选择；继电保护；防雷 Abstract Electricity substation is an important component of the system, it has a direct impact on the entire power systems security and economy, users are connected power plants and the intermediate links, transformation and distribution of electric energy to play the role. This design is the construction of a 110 KV substations terminal buck, first of all based on the reliability of the main cable and run the flexibility to choose various voltage levels of the connection mode. And from the economic and technical aspects to compare, select the optimal connection mode. Second according to various levels of load voltage transformer to calculate the capacity to select the main transformer of Taiwan and its capacity, and other models ﹑ various parameters. Once again, according to choose the main form of short-circuit wiring, paint and network equivalent to short-circuit, according to calculate the three-phase short circuit, short circuit current, short-circuit capacity, short-circuit the impact of current value. According to select the final calculation of the various short-circuit the bus voltage, circuit breakers, switches isolation, current, voltage transformers, arresters, and check to see whether the appropriate selection of devices, and also done a transformer relay. Key words: main electrical connection ；short circuit current ; choice of main electrical equipment ; relay protection;anti-lightning; 目 录 摘 要 I Abstract II 第一章 引 言 1 1.