摘要

本设计是中天国际建筑的供电系统设计，建筑物高33米，地下一层，其主要有车库、消防控制室、变配电室、柴油发电机房和几个较大的会议室。地上九层，主要为各部门办公室、会议室、接待室等。

由于建筑电气的设计涉及的范围很广，本次毕业设计仅对大楼电气设计的部分主要内容进行设计，主要包括供配电系统设计、柴油发电机房设计、大楼部分照明设计、部分动力设计、防雷接地设计。

在对大楼进行设计前，先收集了相关的资料和参阅了相关的规范。在负荷统计过程利用了需要系数法、单位指标法等方法，再计算出各回路的计算电流，选取各级开关电器的型号，然后再按一定折扣选择导线的截面和母线的截面，接着计算出高、低压侧的短路电流，最后完成各种开关电器、电缆和母线的校验。在进行照明设计时，先对了一个房间计算了其需要的灯具数目，确定了灯具间的间距，以此来对其他房间进行布置灯具。在进行防雷接地设计时，先确定了其防雷等级，再对屋顶进行了避雷带的设计和负一层接地设计。最后介绍了一些电气安全的相关问题。

关键字：配电系统；负荷计算；短路电流；照明设计

ABSTRACT

This design is the power supply system design of Zhongtian International Building, the building is 33 meters high, the first underground floor, it mainly has garage, fire control room, transformer and distribution room, diesel generator room and several larger conference rooms. Above-ground nine floors, mainly for each department office, conference room, reception room and so on.

Because the design of building electrical involves a wide range, this graduation design only designs some of the main contents of the building electrical design, mainly including power supply and distribution system design, diesel generator room design, building part lighting design, part power design, lightning grounding design.

Before designing the building, the relevant information and specifications are collected. In the process of load statistics, the calculation current of each circuit is calculated by using the method of requirement coefficient and unit index, the type of switchgear at all levels is selected, the cross section of conductor and the cross section of busbar are selected according to certain discount, and the short circuit current of high and low voltage side is calculated. Finally, the calibration of all kinds of switchgear, cable and busbar is completed. In the lighting design, the number of lamps needed in one room is calculated, and the distance between the lamps is determined, so as to arrange the lamps in other rooms. In the design of lightning protection grounding, the lightning protection grade is determined first, then the lightning protection belt design and the negative first layer grounding design are carried out on the roof. Finally, some related problems of electrical safety are introduced.