某企业kV变电所电气设计一次部分

精品文档---下载后可任意编辑摘 要本篇毕业设计的课题是“某企业 35kV 变电所电气设计”，主要是关于强电部分的设计。本设计分别从主接线、短路电流计算、主要电气设备选择等几个方面对变电站进行了阐述，并绘制出电气主接线图、电气总平面布置图、防雷与接地图等相关图纸。由于存在两条独立电源进线，本次设计采纳两台主变压器，并根据给定的计算负荷，选定额定容量为 8000kVA 变压器 SZ11-8000/35。通过比较各种主接线方案的优缺点，最终确定 35kV 电压等级侧采纳线变组接线方式；6kV 电压等级侧采纳单母分段式接线方式。在绘制出电气主接线简图的基础上，分别选择主变压器高低侧短路时作为短路点，计算出短路电流，从而作为选择及校验主要电气设备的依据。主要电气设备包括断路器、隔离开关、熔断器、电流互感器、电压互感器、母线、避雷器。按正常工作条件下选择设备的额定电流、额定电压及型号，按短路情况下校验设备的热稳定、动稳定以及开关的开断能力。在主要电气设备都选定的基础上，可以绘制出最终的电气主接线图、平面布置图、防雷与接地图。关键词：主变压器，主接线方式，短路电流，电气设备AbstractThis graduation thesis is about “Electric design foran enterprise”. It is mainly about the design of heavy current system. This design separately from the main connection, short-circuit current calculation, the main electrical equipment selection and so on several aspects of substation were introduced, and map out the main electrical wiring, electrical general layout, lightning protection and pick up the map and related drawings. Because there are two separate power lines, the design uses two main transformers, and according to the given load, rated capacity of up to 8000kVA transformers SZ11-8000/35 is selected. By comparing the various advantages and disadvantages of main wiring scheme, finalize 35kV voltage line transformer connection 6kV voltage single-segment connection. Draw on the basis of main electrical wiring diagram, as a short circuit when you choose high and low-side short circuit of...