XXXX学院2008级毕业论文(设计)
35kV降压变电站电气部分设计
摘 要
本设计的题目为“35kV降压变电站电气部分设计”。设计的主要内容包括:35/10.5kV变电站主变压器选择;变电站电气主接线设计;短路电流计算;电气设备选择(母线、电缆、高压断路器、隔离开关、电流互感器、电压互感器和避雷器);变电站微机综合自动化;电气设备的布置(户外35kV高压配电装置的布置和户内10kV箱式变电站的布置);防雷设计等。
根据电气主线设计应满足可靠性、灵活性、经济性的要求,本变电站电气主接线35kV高压侧采用单母线接线,10.5kV侧也采用单母线接线形式;短路电流的计算包括短路点的选择及其具体数值计算;而电气设备选择采用了按额定电流选择,按短路电流计算的结果进行校验的方法;保护配置是按查阅的资料进行设计;变电站微机综合自动化是结合当今变电站的发展趋势进行设计;电气设备的布置是按电气设备间要求的间距进行设计;本变电站采用避雷针防直击雷保护。
关键词:35kV降压变电站设计; 电气主接线; 微机综合自动化;
XXXX学院2008级毕业论文(设计)
ABSTRACT
The design on the topic of \Institute of Technology Teaching Building substation expansion preliminary design.\transformer substation choice; Electrical Substation main wiring design; Short-circuit current calculation; Load Calculation; Reactive power compensation; Electrical Equipment (bus, HV circuit breakers, isolation switches, current transformer and voltage transformer, and compensation capacitor MOA); Distribution Equipment design; relay Planning and Design; Lightning protection design.
According to the main line of electrical design should meet the reliability, flexibility, economy requirements, The substation main electrical wiring High Side single-bus wiring, low voltage side of the single-bus above the main electrical wiring form; the low-pressure side load calculated using the statistical needs coefficient; To reduce the reactive power loss, increased energy utilization, The design of reactive power compensation design, power factor from 0.69 to 0.9; short-circuit current calculations include short-circuit point for the selection and specific numerical calculation; and electrical equipment chosen by the choice of rated current, short-circuit current calculation by the results of the calibration methods; relay design of the main transformer Current Protection and over-current protection design; distribution installations complete set of power distribution equipment; The substation using direct lightning stroke prevention lightning protection.
The design is very close attention to the use of our electrical design of the new technology and new equipment, practical and strong, Taking into account the actual application, in a user-friendly language to describe it.
Key words:: substation design; Electrical wiring; Relay .
XXXX学院2008级毕业论文(设计)
目 录
摘 要 ................................................. ABSTRACT .............................................. 目 录 ................................................ 毕业设计任务书 ......................................... 前 言 .............................................. 一 毕业设计概述 ...................................... 1
1.1毕业设计题目 .......................................... 1 1.2毕业设计目的 .......................................... 1 1.3毕业设计内容 .......................................... 1
二 35KV降压变电站设计 ............................... 2
2.1设计原则及特点 ........................................ 2 2.2设计原则 .............................................. 2 2.3设计特点 .............................................. 2 2.3设计说明 .............................................. 2
三 主变压器的选择 .................................... 3
3.1主变压器容量、台数、型号选择 ........................... 3 3.2站用变压器选择 ........................................ 4
XXXX学院2008级毕业论文(设计)
3.3低损耗配电变压器的结构 ................................. 5 3.4低损耗配电变压器的特点 ................................. 6 3.5油浸式变压器防火安全措施 ............................... 6
四 变电站电气主接线设计 .............................. 8
4.1电气主接线的基本要求和原则 ............................. 8 4.2电气主接线设计程序 .................................... 9 4.3电气主接线设计 ....................................... 11
五 短路电流计算 ..................................... 15
5.1短路概述 ............................................. 15 5.2造成短路原因 ......................................... 15 5.3短路危害 ............................................. 15 5.4短路计算 ............................................. 16
六 电气设备的选择 ................................... 22
6.1电气设备及分类 ....................................... 22 6.2电气设备的选择 ....................................... 23
七 防雷保护设计 ..................................... 32
7.1雷电过电压 ........................................... 32 7.2雷电的危害 ........................................... 32 7.3防雷保护装置 ......................................... 32 7.4防雷设计 ............................................. 33 7.5防雷保护计算 ......................................... 33
XXXX学院2008级毕业论文(设计)
结 论 ............................................... 36 致 谢 .............................................. 37 参考文献 ............................................ 38 附 录 .............................................. 39 35KV降压变电站图纸目录 .............................. 40