110kV区域降压变电所电气系统的设计

110kV区域降压变电所电气系统的设计

摘 要:在电力系统中,变电站是衔接发电厂与用户的中间环节,它对经济的运行以及整个电力系统的安全会产生重要的影响,而且对整个电力系统具有变换电能和分配电能的作用。在这次设计中,我是针对电力系统中的接线形式、计算短路电流的方法﹑怎样选取变压器﹑怎样选取母线和检验及怎样选取电气设备。还包括母线的继电保护、主变压器的继电保护、怎样防雷的规划及配电装置的设计等主要内容,我这次设计目的让电力供应和传输更便捷、经济、可靠、灵活和安全。

关键词:主变压器; 主接线; 短路电流的计算; 简单的潮流计算; 主要的电气设备

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The design of the 110kv regional step-down substation

electrical system

Abstract :Substation is an important member of the power system, it directly affect the safety and economic operation of the whole power system, is bond the users of the intermediate links with the power plants, has important influence in the transformation and distribution of electric energy. This design is to make up a system of wiring, short circuit current calculation, how to select the form of transformer, how to select the busbar and calibration and how to select the electrical equipment; The staple transformer relay protection, bus protection, lightning protection planning, power distribution equipment design such as the main content, the design is in line with the power provide and conveying of safe, inerrable, agility, financial condition principles.

Keywords :main transformer; main wiring; short current calculation; flow calculation; stable electrical equipment.

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目 录

前言 ....................................................................... 1 第一章 主接线的设计 ........................................................ 2

1.1主接线设计原则 ...................................................... 2

1.1.1考虑变电所在电力系统中的地位和作用 ............................ 2 1.1.2考虑近期和远期的发展规模 ...................................... 2 1.1.3不同级别负荷对主接线的影响 .................................... 2 1.1.4考虑主变台数对主接线的影响 .................................... 2 1.1.5考虑备用容量的有无和大小对主接线的影响 ........................ 2

第二章 主变压器的的设计 ................................................... 3

2.1 主变压器的概述 ..................................................... 3 2.2 主变容量的确定 ..................................................... 3 第三章 各级配电装置的设计 .................................................. 4

3.1 配电装置概述 ....................................................... 4 3.2 配电装置的要求 ..................................................... 4 3.3 配电装置的分类及适用范围 ........................................... 4 第四章 短路电流与简单电力系统潮流的计算 .................................... 5 4.1 短路电流的概述 ...................................................... 5

4.1.1计算短路电流的方法 ............................................. 5 4.2 潮流计算的概述 ...................................................... 6 4.3 电力网的电压降和功率损耗 ............................................ 6 4.4 简单电力网的潮流计算 ............................................... 11

4.4.1已知同一点电压和功率的潮流计算 ............................... 12 4.4.2 已知不同点电压和功率的潮流分布计算 ........................... 14

第五章 电气设备的选择 ..................................................... 15

5.1 概述 .............................................................. 15 5.2 断路器、隔离开关、母线的选择 ...................................... 15 5.3互感器的选择 ....................................................... 15

5.3.1电流互感器的选择 ............................................. 15

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