毕业论文铁路局西院住宅小区12号楼照明供配电系统设计.DOC

兰州交通大学毕业设计（论文） 摘 要 本设计为兰州铁路局下西院住宅小区12号楼照明供配电系统设计。设计负荷等级为 三级，进线电压为380/220V，户用电负荷为6千瓦。设计内容包括：照度计算、负荷计算、 导线及其截面的选择、低压断路器电流整定、设备制作及安装、等电位联接安装及防雷 与接地系统设计。 本设计采用单位容量法进行照度计算，采用需用系数法进行负荷计算，按导线长期 允许温升和电压损失选择导线截面，按线路最大工作电流和线路保护选择低压断路器。 照明回路和插座回路分别由不同回路供电，并在插座回路安装剩余电流保护器。按三类 防雷建筑物进行防雷设计，接地采用TN— S系统，并设计总等电位联结和局部等电位联结系统。 设计符合国家相关技术规程规范要求，设备选型合理，满足使用功能要求，能较好 地指导施工。 关键词：住宅；照明；负荷计算；供配电系统；防雷 - I - Abstract The design is entitled with electrical illumination design on the 12th residential building located in Xiaxi Courtyard of Lanzhou Railway Bureau. The load level of the project is designed as the 3rd hierarchy, and input voltage level is presented by 380/220V, and household load is designed as 6kW. The design contents include illumination calculation, load calculation, and the selection of circuits and cross sections, and the current setting of low voltage breaker, and equipments making and installation, and equiotential bonding, and as well as lighting protection and grounding system and et al. Firstly, unit capacity method is applied to implement illumination calculation, and the needed coefficient method is applied to implement the load calculation, and the cross sections of the circuits are selected according to long-term allowable temperature rise and voltage loss, and the low-voltage breakers are selected according to the maximum working current and line protection conditions. Socket and lighting circuits are arranged in different supply loop, and leakage protection breaker is applied in socket loop. Lighting protection with the 3rd level is designed in accordance with specifications, and grounding system adopts TN-S system, and general equipotential connection, togenther local equipotential connection is designed. The overall design accords with the relevant technical regulation requirements. Equipments select