合肥市20KV电压配电项目可行性初探（Feasibility study of 20KV voltage distribution project in Hefei City）.docVIP

合肥市20KV电压配电项目可行性初探（Feasibility study of 20KV voltage distribution project in Hefei City） Feasibility study of 20KV voltage distribution project in Hefei City Lidiming Author: Hefei Municipal Planning Bureau, engineer In the electric power network, the distribution network bears the important role of connecting the preceding and the following. A large amount of electrical energy produced by power plants is transmitted to the load centers through the transmission network in the form of high voltage and high power, which must be transmitted and allocated to the users at the most appropriate voltage levels. As a bridge between power transmission network and power users, distribution network and its power supply level are reasonable, which is closely related to the safety, reliability and economical operation of the whole network. At present the city 220 / 110 / 10 / 0.4 and 220 / 110 / 35 / 0.4 two substation level distribution network can not meet the current situation and planning of city electricity demand, therefore, to carry out new research on distribution network voltage level city, looking for higher transmission capacity, better transmission network the project cost, more economical, and the status quo of city power grid with a better alternative distribution voltage levels, has become the essential research topic. In this case, the 220 / 110 / 10 / 0.4 voltage level is raised to 220 / 110 / 20 / 0.4 voltage level, which is a good way to solve the problem of low capacity of medium voltage distribution, improve the reliability of power supply and meet the needs of users power consumption. Development status of 20 KV distribution voltage level in two domestic and overseas Relevant data shows that with the development of economy, the increase of load, in order to seek the minimum expenditure and the highest operating profit, the United States as early as 1948 on the part of the 20.8 ~ 24.9 KV voltage; France and Germany began to develop 20 KV voltage level at the