6kV变电所及低压配电系统的设计

本科生毕业设计

6kV变电所及低压配电系统的

设计

目录

摘要............................................................... I 绪论 (2)

1总体设计方案 (4)

2 车间变电所负荷计算及无功补偿 (5)

2.1车间负荷计算（机加工一车间） (6)

2.2无功功率补偿 (9)

3车间变电所主变压器的选择 (10)

4 变电所主接线方案的设计 (11)

5 短路电流和容量的计算 (13)

6 变电所一次设备的选择 (16)

6.1 一次设备选择的一般要求 (16)

6.2 选择各类电气设备的特别的要求 (16)

6.3 一次设备校验应满足的条件 (17)

7 变电所高压进线和低压出线的选择 (19)

7.1变电所进线方式的选择 (19)

7.2 变配电所进出导线和电缆的选择 (19)

7.3 各类电力线路的导线截面的选择步骤 (19)

7.4 电力线路选择的具体公式 (20)

7.5 设计进出线的选择 (21)

8 车间配电线路设计 (22)

8.1 6KV高压母线的选择 (24)

8.2 车间变电所低压侧母线的选择： (24)

9继电保护以及二次回路的设计 (25)

9.1 继电保护装置的基本要求 (25)

9.2 二次回路的接线安装要求 (25)

9.4 6KV主变压器的保护装置设计 (26)

9.5 高压断路器的操动机构控制与信号回路 (28)

9.6 防雷保护和接地装置设计 (30)

鸣谢 (31)

参考文献 (32)

摘要

供配电CAD技术是计算机技术在电气工程设计领域的另一应用。但是我国供配电CAD技术仍停留在绘图和计算相分离的阶段，还未形成一体化的CAD系统，而供配电系统的设计是一项复杂的工程，它包括需求分析、各级负荷容量的确定、高低压配电系统设计、变电所设计等，需要分析计算和绘制大量的图纸，工作量庞大。

本文针对上述情况，分析研究了6kV及以下低压供配电系统的设计原则和设计内容，查找设计资料、设计规程规范、各种相关电气设计手册，了解设计需要的各种数据，并在研究了电气图形、供配电方案、数据间内在联系机理及其关系的基础上，对供配电系统进行拓扑描述和结构识别；建立了6kV及以下低压供配电一次部分的变压器、线路、断路器、电压电流互感器、熔断器、开关等主要设备元件对象的描述方法和关联知识规则；采用面向对象技术和图示化技术，设计了表达电气设备特征的基本图元库、支路图元库及模板图形库；创建了实现分析计算、绘图、数据处理一体化的供配电一次CAD系统的总体结构框架，完成了负荷计算与无功补偿、变压器选型、主结线确定、电气设备选型等各功能模块的设计；并能同时进行图形输出和各种文档的打印输出。

关键词：变压器;负荷计算;变电所；低压配电

Abstract

CAD technology is another application of computer technology in the field of electrical engineering design. But our country for distribution of CAD technology remains in calculating and drawing phase separation stage, has not yet formed the integration of CAD system, and for the design of distribution system is a complex project. It includes demand analysis, at all levels of the load capacity, high and low voltage power distribution system design, electrical design, need analysis, calculation and drawing of a lot of and huge workload.

Based on the above analysis, design principles and design elements of 6kV and below the low-voltage power supply system, find the design data and design specification, all kinds of electrical design manual, to understand the various data needed for the design, and based on the electric power supply system, graphic relation mechanism between data, and the relationship between the scheme on the topological description and structure identification of power supply and distribution system; establish 6kV and low voltage element main equipment for the power distribution of a part of the transformer circuit breaker, current transformer, voltage fuse, switch description method and related knowledge rules; using object-oriented technology and graphic design technology. The expression of electrical equipment characteristics of the basic graphics library, graphics library and template library branch; create analysis calculation, drawing, data Deal with the integration of the power supply and distribution of a CAD system of the overall structure of the framework, completed the design of each function module of the load calculation and reactive power compensation, determine the transformer selection, main wiring, electrical equipment selection; and print and output of graphics output and all kinds of documents.

KEY WORDS:TRANSFORMER; LOAD CALCULATION; SUBSTATION; LOW VOLTAGE POWER DISTRIBUTION