某地区110KV降压变电站设计

论文编号:DQ047    论文字数:13655,页数:40  附CAD图

摘  要
 毕业设计是对所学知识的一次综合性运用，能够加深我们对基础知识的理解，为以后的工作打下良好基础。变电站的一次接线指的是对用户供电的部分。其中，对外供电的部分称为主接线。为了变电站的生产和工作人员的生活对内供电的部分称为站用电接线。本设计严格遵循变电所电气部分的设计原则。通过对电气主接线的设计和计算、所用电的设计和计算、短路电流的计算、电气设备的选择和校验以及配电装置的设计，完成了对所给（110KV）变电所的电气一次部分的设计。
 由于条件的限制，本次毕业设计对变电站电气一次部分作了较详细的设计，而对于电气二次部分进行了省略，希望在以后的学习和工作中可以进行更深入的研究。

关键词：供电、主接线、设计、选择和校验

Abstract
Graduation project is a syntheses handle to the knowledge that we have learned. It can strengthen the comprehension to the basic knowledge and it is a favorable foundation to the work.. The primary distribution system of the substation refer versus user running part. The external power supply part is called main connection. The inter power supply part ,which supply for the work of transformer substation and for the workers’ life is called substation supply connection.This design follows the design principles of electric part of the substation strictly. Through the medium of designing and reckoning the electric main connection, designing and counting house supply, counting short-circuit current, selecting and verifying electrical equipment as well as designing switching arrangement, it have accomplished the design of the primary distribution system of the （110KV）substation that have been given.
Because of restrict of some conditions, in this dissertation, only the primary distribution system of the substation is designed, and the secondary distribution system, this paper have omited to do it, I looking forward to doing further study in the future.

Keywords：power supply，main connection，designation，choose and checkout

目 录
摘  要------------------------------------------------------------------------------------Ⅰ
1  绪  论---------------------------------------------------------------------------------1
 1.1 设计背景-----------------------------------------------------------------------------1
 1.2 电力系统及变电站原始资料-----------------------------------------------------------1
 1.3 设计步骤及任务----------------------------------------------------------------------3
2  负荷资料统计-------------------------------------------------------------------------4
 2.1 负荷的分析--------------------------------------------------------------------------4
 2.2 负荷计算-----------------------------------------------------------------------------5
3  变电站主变压器的选择---------------------------------------------------------------7
 3.1 设计原则-----------------------------------------------------------------------------7
 3.2 主变容量与补偿计算------------------------------------------------------------------7
 3.3 无功补偿设计------------------------------------------------------------------------9
 3.4 主变型式的选择---------------------------------------------------------------------11
 3.5 变压器中性点接地方式和设备的选择-------------------------------------------------12
 3.6 所用变设计-------------------------------------------------------------------------13
 3.7 电力变压器的功率损耗--------------------------------------------------------------14
4  电气主接线设计----------------------------------------------------------------------15
 4.1 电气主接线设计原则与方法----------------------------------------------------------15
5  短路电流计算------------------------------------------------------------------------18
 5.1 短路电流计算目的-------------------------------------------------------------------18
 5.2 短路电流计算的一般规定------------------------------------------------------------18
 5.3 短路电流计算的步骤----------------------------------------------------------------18
 5.4 短路电流计算过程-------------------------------------------------------------------19
6  变电所进出线及母线选择-----------------------------------------------------------25
 6.1 配电所母线选择---------------------------------------------------------------------25
 6.2 110KV高压架空线的选型与截面选择-------------------------------------------------26
 6.3 10KV电缆选择-----------------------------------------------------------------------27
7  主要电气设备选择-------------------------------------------------------------------29
 7.1 110KV侧断路器，隔离开关选择------------------------------------------------------29
 7.2 10KV侧断路器，隔离开关选择-------------------------------------------------------31
 7.3 电流互感器选择---------------------------------------------------------------------34
 7.4 电压互感器选择---------------------------------------------------------------------35
 7.5 电气设备选择一览表----------------------------------------------------------------36
8  总  结--------------------------------------------------------------------------------38
致  谢------------------------------------------------------------------------------------39
参考文献---------------------------------------------------------------------------------40
附录--------------------------------------------------------------------------------------41