论文总字数：23759字

摘 要

本次毕业设计课题为扬州职业大学办公楼电气设计。照明系统首先算出每个房间的各个反射比并依据这个使用利用系数法进行照度计算和灯具数量的选择，采用T5经济型高效直管荧光灯、LED等能耗较低的灯具，然后进行功率密度校验，再对各楼层照明配电箱进行负荷计算，使各回路达到三相平衡并以此为依据选择安全可靠经济合理的配电箱，并选择合适的出线、断路器和敷设方式；供配电系统设计主要是为消防泵、潜污泵、冷却塔、轴流风机等动力设备配电，并确定电缆与桥架的材料以及尺寸等。算出所有用电设备的总负荷进行变压器、高低压主接线、开关柜的初步选择，然后根据主接线方案、变压器需要的总容量及安装环境选出两台合适的干式变压器，并计算出两台变压器的电容补偿来验算选择的变压器是否合理。防雷接地系统计算出建筑物的等效面积和年平均雷击次数以此来确定建筑的防雷等级，并选择合适的网格进行防雷和接地设计。每次毕业设计主要要求学生综合运用之前所学到的知识来解决问题，能够提高学生的实践能力并且拓宽学生的工作面。

关键字：办公楼电气设计 照明系统 防雷接地系统 供配电系统

Yangzhou Vocational University Office Building

Abstract

This graduation project for Yangzhou Vocational University office building electrical design. The lighting system adopts T5 economical and efficient straight tube fluorescent lamp, LED and other low energy consumption light source, first calculates each room reflection ratio and according to this use coefficient method to carry on the illuminance calculation and the lamp quantity choice, then carries on the power density check, then carries on the load calculation to each floor lighting distribution box, causes each circuit to achieve the three-phase balance and therefore selects the safe reliable economical reasonable distribution box, and selects the suitable outlet line, the circuit breaker and the laying way; the power supply and distribution system design is mainly for the fire pump, the submersible pump, the cooling tower, the axial flow fan. Power equipment distribution, and determine the cable and bridge materials and dimensions. Calculate the total load of all electrical equipment to carry out the preliminary selection of transformer, high and low voltage main wiring, switchgear, and then select two suitable dry transformers according to the main wiring scheme, the total capacity required by the transformer and the installation environment, and calculate the whether the selected transformer is reasonable. The lightning protection grounding system calculates the equivalent area of the building and the annual average number of lightning strikes to determine the lightning protection grade of the building, and selects the appropriate grid for lightning protection and grounding design. This graduation project mainly requires students to comprehensively use the knowledge they have learned before to solve problems ,improve their practical ability and broaden their working face.

Key words: Electrical design of office buildings；Lighting system；lightning protection grounding system；power distribution system

目录

摘要 I

Abstract II

目录 III

第一章 系统概述 1

1.1 工程概述 1

1.2 设计概述 1

1.3 设计依据 2

第二章 照明系统 3

2.1 光照设计 3

2.1.1本工程所选灯具情况 3

2.1.2照明设计标准 4

2.1.3 照度计算 5

2.2 电气设计 14

2.2.1设计方案 14

2.2.2负荷计算 14

第三章 供配电系统 24

3.1 动力设备的配电方式 24

3.2 供配电系统设计 24

3.2.1供配电系统设计原则 24

3.2.2动力负荷计算 24

3.2.3变压器、高低压主接线、开关柜的初步选择 27

3.2.4接地方式 28

3.3负荷、电容补偿、短路计算、设备选型 28

3.3.1一号变压器负荷、电容补偿计算 28

3.3.2二号变压器负荷、电容补偿计算 31

3.4短路计算 32

第四章 防雷接地系统 34

4.1 防雷等级 34

4.2 防雷措施 34

4.3 接地措施 34

4.3.1接地要求 35

4.3.2安全措施 35

参考文献 36

结语 38

致谢 39

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