本文设计主要是完成教育局办公楼的供配电系统设计，研究方向为工程供电。随

The design of this paper is mainly to complete the design of the power supply and distribution system of the office building of the Education Bureau, and the research direction is power supply for the project. With the advancement of science and technology and the rapid development of power systems, the design and installation of power supply and distribution systems occupy more and more important positions in our buildings, and the quality of their installation directly affects the personal safety of users. This paper mainly completes the work of engineering summary, load class, main wiring form determination, load calculation, short circuit current calculation, selection and verification of main electrical equipment, etc. First of all, the project is summarized, the basic data of the building is collected, and the CAD software is used to obtain the area of ​​each floor of the design building. The total area of ​​the building is 22656 square meters; the load is graded and the capacity is confirmed, and the power of the office electricity for each floor The load density method is obtained by multiplying the area by the load density index; the system provides a 10kV one-time incoming line. From the aspects of safety, economy, and reliability, it is determined that the single-bus wiring form is used on the high-voltage side of the main wiring system. The low-voltage side adopts the main wiring form of single bus section connection and diesel generator; then load calculation, first check the table to confirm the power factor and the required coefficient of the equipment, and secondly use the required coefficient method combined with the main wiring point-by-point calculation to complete A Calculate the load to point D, and then calculate the load capacity according to the compensated point B to determine the capacity and type of the transformer; then use the approximate unit value method to calculate the three-phase short-circuit current, and determine the main electrical Check the model of the equipment, including circuit breakers, disconnectors, busbars, transformers, Power cables and the like; and finally determining lightning grounding. Thus completing the design of the power supply and distribution system of the office building of the Education Bureau.

本文设计主要是完成教育局办公楼的供配电系统设计，研究方向为工程供电。随着科学技术进步和电力系统的快速发展，供配电系统的设计安装在我国建筑中占据着越来越重要的位置，其安装质量直接影响着使用者的人身安全。本文主要完成了工程概括、负荷等级、主接线形式确定、负荷计算、短路电流计算、主要电气设备选择及校验等工作。首先进行工程概括，搜集该建筑基本资料，利用CAD软件求得设计大楼的每层面积，该建筑总面积为22656平方米；对负荷进行分级及确认其容量，每层楼办公用电的负荷功率采用负荷密度法通过面积乘以负荷密度指标求得；该系统提供了10kV的一回进线，从安全、经济、可靠等多方面综合考虑，确定了主接线系统高压侧采用单母线接线形式，低压侧采用单母线分段联络外加柴油发电机的主接线形式；接着进行负荷计算，首先对设备的功率因数和需要系数进行查表确认，其次采用需要系数法结合主接线逐点计算来完成A到D点的计算负荷，然后根据补偿后B点计算负荷容量来确定变压器的容量及型号等；接着采用近似标幺值法对三相短路电流进行计算，根据短路电流计算的结果，确定主要电气设备的型号并进行校验，包括断路器、隔离开关、母线、互感器、电力电缆等；最后再确定防雷和接地。从而完成教育局办公楼的供配电系统设计。

The design of this paper is mainly to complete the design of the power supply and distribution system of the office building of the Education Bureau. With the progress of science and technology and the rapid development of power system, the design and installation of power supply and distribution system plays an increasingly important role in the construction of our country, and its installation quality directly affects the personal safety of users. This paper mainly completed the engineering summary, load level, main wiring form determination, load calculation, short circuit current calculation, main electrical equipment selection and calibration. First of all, the project is summarized, the basic information of the building is collected, and the area of each floor of the design building is obtained by CAD software. The total area of the building is 22656 square meters. The load is graded and its capacity is confirmed. The load power of office power of each floor is obtained by multiplying the area by the load density index. The system provides a 10KV loop line from safety and economy According to the comprehensive consideration of reliability and other aspects, it is determined that the high-voltage side of the main wiring system adopts the single bus connection form, and the low-voltage side adopts the single bus section connection plus the main wiring form of diesel generator; then the load calculation is carried out. First, the power factor and demand factor of the equipment are checked and confirmed, and then the demand factor method and the main wiring point by point calculation are used to complete the calculation of points a to d Calculate the load, and then determine the capacity and model of the transformer according to the calculated load capacity of point B after compensation; then calculate the three-phase short-circuit current with the approximate per unit method, and determine the model of the main electrical equipment and verify it according to the calculation results of the short-circuit current, including the circuit breaker, disconnector, bus, transformer, power cable, etc.; finally determine the lightning protection and connection Land. So as to complete the design of power supply and distribution system of the office building of the Education Bureau.