中压配电电压等级优选..doc

上海电力学院 本科毕业设计（论文） 题　　目： 中压配电电压等级优选研究 院　　部： 电气工程学院 专业年级： 电气工程及其自动化 2013届 学生姓名： 倪盛 学号： 指导教师： 汤波 2013年6月16日  【摘 要】 我国城市、工业园区电网的电压等级的划分基本上以500、330、220kVAbstract】 Voltage classes of urban power grid and industrial park power grid in our country are mainly divided into 500,330,220kV transmission voltage grade.110,35kV high voltage distribution voltage grade,20,10kV medium voltage distribution voltage level,0.4kV low voltage power distribution voltage grade.10kv and 20kv voltage level as the medium voltage distribution voltage grade have applied at home and abroad.But along with economic development,the power grid’s scale expands,the voltage distribution voltage grade is sorting out continually and upgrading unified step by step instead of standing still.With the rapid development of our countrys economy and increase of electric power’s demand,traditional 10 kv power supply can’t meet the power supply requirements in high load density area,it has clearly showed the shortages in transmission distance, power transmission, power loss etc. Many scholars’research shows that the medium voltage distribution network voltage grade can consider to use foreign relatively mature 20 kv,and 20 kv voltage grade have become urgent needs in some of the city and development zone distribution network,and in some areas has been put into actual operation.But which superiority is the 20 kv power supply relative to 10 kv, which circumstances is more suitable for using 20 kv,all these need to be reached according to detailed technical and economic studies. So in this paper medium voltage distribution network is discussed in the aspects of technical, economic and social resources and whether it is adopt demonstrates the 20 kv voltage grade and Get some guidance significance in terms of the 20kV voltage level conclusions from it, and has the important practical significance. Key Words: Medium voltage distribution network;Voltage level; 20kv; Reliabi