1、 - I - 摘 要 本设计为瓜州县第二中学图书实验楼强电电气设计。设计负荷等级为三级，进线电 压为 380/220V。设计内容包括：确定照明方式以及种类、确定照度标准、选择合适的光 源、照度计算、照明负荷计算、选择照明线路的导线，配电系统设计以及防雷与接地系 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照明负荷计算，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。按三类防雷建筑物进行防雷设计，接地 采用 TN-S 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
2、地指导施工。 关键词：关键词：综合综合楼；楼；照明照明；负荷计算负荷计算；供配电系统供配电系统；防雷接地防雷接地 - II - Abstract The design is entitled with electrical design on the Library and experiment building of the second school of Guazhou. The load level of the project is designed as the 3rd hierarchy, and input voltage level is presented by 380/2
3、20V. The design contents include determing the illumination mode and type, deteming the illuminance standard, determing the appropriate light source, illumination calculation, load calculation, and the selection of circuits and cross sections, the design of electrical illumination, and as well as li
4、ghting protection and grounding system. 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 section 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. Lighting and socket circuits are arranged in different suppl
