毕业设计（论文）-110KV降压变电所设计毕业设计.docVIP

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、配电装置的布置等，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。然后，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。最后作出平面布置图和防雷保护设计。 ABSTRACT Electricity substation is an important component of the system, it directly affect the power system security and economic operation of power plants are linked and users of intermediate links, transformation and distribution of power plays a role. The master document of substation is the main link in the main electrical wiring ,which directly related to the development of the whole plant (subtations) the choice of electrical equipment, power distribution devices and so on, such as the arrangement is part of the investment the size of the electrical substation decisive factor. The design of the construction of a 110KV step-down substation.First of all, according to the main terminal of the economic and reliable operation of all flexibility to choose the connection mode voltage, in the technical aspects and economic aspects of comparison, the flexibility to select the optimum connection mode.Second, I have to carry out short-circuit current calculation, according to point out the short-circuit short-circuit all the short-circuit current and the impact of steady-state current. Then, according to the voltage level of rated voltage and maximum continuous operating current equipment choice, and then proceed to check. To make a final floor plan and design of lightning protection. Key word： subtation master document calculation of short circuit electric equipment selection 目 录 引 言 1 1电力系统分析及变电站总体分析 2 1.1电力系统分析 2 1.2变电站总体分析 3 1.2.1建站规模 3 1.2.2变电所概况 3 2负荷分析和主变压器的选择 5 2.1负荷分析 5 2.1.1负荷分类和定义 5 2.1.2本设计中的负荷分析 5 2.2负荷计算 7 2.2.1负荷计算的意义 7 2.2.2负荷计算 7 2.3主变压器的选择 8 2.3.1主变压器的选择原则 8 2.3.2主变压器台数的确定 8 2.3.3变压器相数的确定 9 2.3.4变压器绕组数的确定 10 2.3.5变压器联结组别的确定 10 2.3.6变压