某大厦供配电系统设计剖析

某大厦供配电系统设计

摘要

本课题是关于大厦供配电系统包含变电所的设计。该设计是大厦二类负荷对供电可靠性的要求和根据国家规范要求，制定的设计方案及供配电措施。在该设计中，根据给定的设计范围和基础资料，建立起适合自身生产及发展需要的供电系统。为确保负荷供电的可靠性，该大厦的供电系统由两条10kV高压架空进线提供电源。为了适应大厦自然功率因数低和用电负荷变化大的特点，本设计中采取并联电容器的方式进行无功功率补偿，从而减少供电系统的电能损耗和电压损失，同时也提高了供电电压的质量。设计中充分体现了安全、可靠、灵活、经济等原则。该设计确定二次继电保护方案，选用先进的自动保护装置；确定变电所防雷过压保护与接地保护方案；根据设计要求，绘制大厦供配电系统图。

关键词：供配电系统；负荷计算；一次接线；二次接线；短路电流；防雷

分类号：TM727.5

The Distribution System

Design of A Building

Abstract

This topic is about building power supply system and substation design. The design ideas are based on national regulatory requirements and the building load to the power supply reliability of two types of requirements, develop design and supply measures. In this design, the design based on the scope and given basic information, and establish their own production and development needs for the power supply system. The building by two 10kV high voltage power supply systems into the line overhead to provide power supply, to ensure the reliability of the load. In order to meet building electricity load changes, the natural characteristics of low power factor, the design methods used to compensate for shunt capacitor reactive power, power supply system to reduce power loss and voltage loss, while improving the quality of supply voltage . Designed to reflect a safe, reliable, flexible and economic principles. Determine the location of substation, form, number and capacity of main transformer station, etc.; determine the secondary protection programs, use the advanced automatic protection devices; determine substation lightning over-voltage protection and grounding protection program; according to design requirements, draw Building supply and distribution system maps.

Keywords：Supply and distribution systems; load calculation; primary connection; secondary wiring; short-circuit current; lightning protection

目录

摘要............................................................................................................. I 目录........................................................................................................... I II 1 绪论 (1)

1.1 建筑供配电的意义 (1)

1.2 高层建筑对供配电系统的需求 (1)

1.2.1 供电的连续性 (1)

1.2.2 供电的可靠性 (2)

1.3 高层建筑供配电系统电气设计基本原则 (2)

1.4 高层建筑供配电系统设计 (2)

1.5 建筑供配电设计的一般原则 (3)

2 工程概况 (4)

3 负荷数据 (5)

3.1 用电设备负荷 (5)

3.2照明负荷计算 (5)

3.3 电力负荷及日常消防负荷 (5)

3.4火灾时消防负荷 (5)

3.5变电所负荷计算 (6)

4 负荷分级及供电电源 (7)

4.1 负荷等级及容量 (7)

4.2 供电电源 (7)

4.2.1 电压选择与电能质量 (7)

4.2.2 电力变压器选择 (8)

4.3 变电所电气主接线设计 (10)

5 变电所所址选择 (12)

6 短路电流计算与高低压电器选择 (13)

6.1 供电部门提供的系统短路数据如下 (13)

6.2 变电所高压侧短路电流计算 (13)

6.3 低压电网短路计算 (17)

6.4 高压电器的选择 (17)

6.4.1 高压断路器的选择 (17)

6.4.2 高压熔断器的选择 (19)

6.4.3 高压互感器的选择 (19)

6.5 低压电器的选择 (21)