110kv区域降压变电所一次系统设计.docx

摘要电力工业是国民经济的一项基础工业和国民经济发展的先行工业，由于电能在工业及国民经济的重要性，电能的输送和分配是电能应用于这些领域不可缺少的组成部分。所以输送和分配电能是十分重要的一环。变电所将电厂或上级电站调整后的电能输送给下级负荷，是电能输送的核心部分。其功能运行情况、容量大小直接影响下级负荷的供电，进而影响工业生产及生活用电。若变电所系统中某一环节发生故障，系统保护环节将动作，可能造成停电等事故，给生产生活带来很大不利。因此，变电所在整个电力系统中对于保护供电的可靠性、灵敏性等指标十分重要。 变电所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。这就要求变电所的一次部分经济合理、安全可靠，只有这样变电所才能正常的运行工作，为国民经济服务。因此变电所设计在其中起到了极其重要的作用，为变电所的建设找到了依靠和标准。 首先通过对原始资料的分析及根据变电所的总负荷选择主变压器，同时根据主接线的经济可靠、运行灵活的要求选择了主接线方案并进行了技术比较，淘汰较差的方案，确定了变电所电气主接线方案。其次进行短路电流计算，从三相短路计算中得到当短路发生在各电压等级的母线时其短路稳态电流和冲击电流的值。再根据计算结果及各电压等级的额定电压和最大持续工作电流进行主要电气设备选择及校验（包括断路器、隔离开关、电流互感器、电压互感器等）。最后，做了防雷保护，并绘制了电气主接线图。关键词：变电所 电气主接线 电气设备选择AbstractThe power industry is a basic industry of national economy and national economic development of the first industry. Due to the importance of electricity in the industry and the national economy. Electricity transmission and distribution of electrical energy used in these areas is an app:ds:absolutelyabsolutely app:ds:necessarynecessary integral part. So transmission and distribution of electric energy is very important. Substation is the core part of the power transmission, make power plants or superior delivery adjustment of electricity to the lower load. Its functional operation, capacity is a direct impact on the supply of the lower load, thereby affecting industrial production and power consumption. If substation system of a link failure, the System Protection link will in the action. May cause power outages and other accidents, and great adverse to the production life. Therefore, in the entire power system, the substation for the reliability of power supply protection, the sensitivity of indicators is very important. The substation is the intermediate links which contact power plants and the user, plays a transformation and distribution of electric energy role. This requires a part of the substation safe and reliable in the economic. Only in this way substation will in normal operational work, serve the national economy. Substation design in which pl