本次-是关于变电所的设计.doc

摘 要 本次毕业设计是关于变电所的设计，用于变电站的供配电。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级，进行了负荷统计和功率因数的补偿SF9-20000/60变压器，采用单母线分段的总降压变电所主线短路电流计算供电线路的选择与校验主要供电设备继电保护设计防雷设计接地保护等。 该设计根据设计任务书的要求，拟定了两套主线方案，并根据对主线的基本要求，从技术上论证各方案的优缺点，最后采用了内桥式线方案；选择供电线路和供电设备时，采用了先按正常运行条件选择，后按短路条件校验的方法；在继电保护设计环节中，该设计确定了继电保护装置，并对保护装置做出整定计算；最后，根据变电所的技术要求，确定了避雷针等防雷设备的技术参数，并对接地装置做出了计算。在设计过程中要绘制相关图纸，包括电气一次主接线图等重要图纸。 变电所；电气主接线；短路计算；继电保护Abstract This graduation project is about the transformer substation design, uses in the transformer substation supplying the power distribution. Substation is an important part of power system，it directly affects the whole power system safety and economical operation. It is the intermediate link of the power station and users. This graduation project has two voltage class, and has carried on the load statistics and the power factor compensation. Two SF9-20,000/60 transformer ,uses the single bus bar partition the total voltage dropping transformer substation main wiring, the short-circuit current computation, supply lines choice and the verification, the choice main generating plant, the relay protection design, anti-radar design, ground protection and so on. This design basis design project descriptions request, has drawn up two set of main wiring plans, and according to the main wirings essential requirements, proves various plans technically the good and bad points, finally has used in the bridge-type wiring plan; When choice supply line and generating plant, has used first according to the normal operation condition choice, latter according to short circuit condition verification method; In the relay protection design link, this design had determined the relay protection installment, and makes the installation computation to the protective device; Finally, according to the transformer substation specification, had determined the lightning rod and so on anti-radar equipments technical parameter, and docked the installment to make the computation. Must draw up the relat